Best AI Email Assistants in 2026: 10 Compared and Ranked

Choosing the best AI email assistant in 2026 is harder than it looks, because the category has quietly split into three incompatible product types that all use the same marketing language. Some are full email clients that replace Gmail. Some are invisible layers that sit on top of the inbox you already have. And some are AI features bundled into a subscription you may already be paying for. Pick the wrong type and you will pay for capability you cannot use.

The market also moved underneath everyone this year. Superhuman is no longer an independent startup — it is the name of the whole company that used to be called Grammarly, and its email product is now branded Superhuman Mail. Meanwhile Google folded Gemini in Gmail into every Workspace tier including the cheapest one, and Microsoft is running a discount on its Copilot add-on that expires at the end of September 2026. Most comparison articles ranking for this keyword were written before any of that happened.

This comparison covers ten AI email assistants with pricing taken directly from each vendor’s own pricing page, verified on July 20, 2026. Where a tool is weak or a limitation is not obvious from the marketing, it is stated plainly.

What Is the Best AI Email Assistant in 2026?

The best AI email assistant in 2026 depends on your setup. Fyxer AI is the strongest pick for drafting and triage across both Gmail and Outlook without changing clients. Shortwave has the deepest AI search for Gmail power users. Superhuman Mail suits speed-focused teams. Inbox Zero is the best value and the only open-source, self-hostable option.

If you only read one section, read the pricing table below. The gap between the cheapest and most expensive tool in this comparison is more than twenty-fold per seat per month, and the expensive end is not automatically the capable end.

Best AI Email Assistants in 2026 at a Glance

Tool	Type	Entry price (per user/month)	Works with	Best for
Fyxer AI	Overlay / assistant	$22.50 annual, $30 monthly	Gmail + Outlook	Drafting and triage without switching clients
Shortwave	Email client	$30	Gmail / Google	AI search across years of email
Superhuman Mail	Email client	$25 (annual), $33 for full AI	Gmail + Outlook	Speed-obsessed teams and sales
Inbox Zero	Overlay / assistant	$18	Gmail + Outlook	Value, privacy, self-hosting
Missive	Shared inbox client	$14 (billed yearly)	Gmail, Outlook, IMAP, SMS, social	Small teams sharing an inbox
Spark Mail	Email client	$8.25 (billed yearly)	Multiple providers	Cheapest full AI email client
Gemini in Gmail	Built into Workspace	$7 (Business Starter, annual)	Google Workspace	Teams already on Workspace
Microsoft 365 Copilot	Built into Outlook	$18 promo / $21 standard add-on	Microsoft 365	Teams already on Microsoft 365
MailMaestro	Add-in	Free tier; $12 annual, $15 monthly	Outlook + Gmail	Outlook users who only want drafting
SaneBox	Filtering service	From $4.54 (2-year billing)	Any IMAP mailbox	Triage only, no generative AI

How We Compared These Tools

This comparison is built from published vendor material, not from a private test lab. For each tool we reviewed the official pricing page, the feature matrix the vendor publishes alongside it, the product documentation and help centre, and any company announcements that changed the product’s ownership, branding or availability. Every price, plan name, tier limit and platform claim in this article was read directly from the vendor’s own site on July 20, 2026.

Where a vendor states a limit precisely — thread caps on AI search, meeting-note quotas, number of AI filters, seat minimums — that figure is quoted. Where a vendor is vague, this article says so rather than guessing. AI email tools change pricing frequently, so confirm current numbers on the vendor’s page before you buy; several of the plans below carry promotional pricing with published expiry conditions.

The 10 Best AI Email Assistants in 2026, Compared

1. Fyxer AI — best AI email assistant for Gmail and Outlook

Fyxer positions itself as a digital executive assistant rather than an email client. It connects to your existing Gmail or Outlook account, sorts incoming mail into categories such as “To Respond”, “FYI” and “Marketing”, writes draft replies in your voice, and sends a notetaker into your video meetings that leaves a follow-up email waiting in your drafts folder afterwards.

The design decision that matters most: Fyxer drafts but never sends. The company states this explicitly in its own FAQ. For anyone nervous about an autonomous agent replying to clients, that is the single most reassuring sentence in this entire comparison. It also means Fyxer will not clear your inbox while you sleep — you still press send on everything.

Pricing is $22.50 per user per month billed annually, or $30 billed monthly, on the Starter plan, which covers one inbox and calendar. Professional is $37.50 annually or $50 monthly and adds multiple inboxes, cross-team and cross-time-zone scheduling, Fyxer Chat for querying your own inbox and meeting notes, a HubSpot integration and the ability to upload files to train Fyxer on your context. Enterprise requires a minimum of 50 users. Every plan has a 7-day free trial, and a seat is defined per person, not per mailbox — connecting both Gmail and Outlook still counts as one seat.

Pros: works with both Gmail and Outlook; never sends without you; notetaker and scheduling included in the base price; SOC 2 Type II, ISO/IEC 27001 and GDPR compliance published, with HIPAA available for enterprise; deleting your account reverts the inbox to its previous state.

Cons: the 7-day trial is short for a tool that needs to learn your writing voice; Starter is limited to a single inbox, so anyone juggling a work and a personal address is pushed to the $37.50–$50 tier; the Enterprise 50-seat minimum rules it out for mid-sized teams wanting SSO.

2. Shortwave — best AI email assistant for searching your own inbox

Shortwave is a full email client built around a chat-style AI assistant. Its distinguishing feature is AI-powered search: rather than matching keywords, it reasons across your email history to answer questions. Shortwave publishes its limits with unusual precision, which makes tier comparison straightforward.

Business is $30 per seat per month and includes standard intelligence, five years of AI search history, a maximum of 50 threads per AI search and three AI-powered filters. Premier at $45 raises that to advanced intelligence, unlimited AI search history, 100 threads per search, ten AI filters and double the context tokens. Max at $120 per seat per month adds expert intelligence, six times the AI usage quota, 150 threads per search, 50 filters and triple context. A 14-day free trial is offered.

Those thread caps deserve attention. If you ask Shortwave a question that genuinely requires reading 300 messages, no tier in the lineup will read all of them. The cap is a real ceiling on what “search your whole inbox” means in practice, and Shortwave deserves credit for publishing it rather than hiding it.

Shortwave also points users toward Tasklet, which it describes as a sister product, for 24/7 workflow automation and connections to thousands of apps — meaning the deepest automation is a second subscription rather than part of the plan.

Pros: the most transparent tier documentation of any tool here; AI memory, saved prompts, personalised AI writing, attachment analysis and AI web browsing on every paid tier; genuine inbox organisation with splits, bundles and auto-labels.

Cons: it is a Google-account-centric client, and Shortwave addresses Outlook support directly in its own pricing FAQ — check that answer before committing if you are on Microsoft; $30 is a high entry price; the $120 Max tier is expensive for an inbox.

3. Superhuman Mail — best AI email assistant for speed and sales teams

Superhuman is the tool most people name first, and it is also the one whose situation has changed most. Grammarly acquired Superhuman in July 2025, then in October 2025 renamed the entire company Superhuman, bringing Grammarly, Coda and the email client under one brand. In July 2026 Coda was rebranded again, to Superhuman Docs. The email product you are buying is now called Superhuman Mail and sits inside a broader productivity platform. If you are reading a review that still describes Superhuman as a standalone email startup, it predates all of this.

Starter is $25 per user per month billed annually at $300 per year, or $33 monthly. Business is $33 per user per month billed annually at $396 per year. Enterprise is quote-only. The tier split is the thing to understand: Starter gets the keyboard-driven speed features, split inbox, snippets, scheduling and basic Superhuman AI. The features people actually associate with an AI assistant — Auto Drafts, Ask AI, custom auto-labels with AI, voice and tone match, knowledge base and the Superhuman Mail MCP server — are Business-tier only. Budget for $33, not $25.

Superhuman is also the most sales-oriented client in this comparison, with HubSpot, Salesforce and Pipedrive integrations, read statuses, recent opens and smart send. The MCP server on the Business tier is notable: it lets external AI agents interact with your mail, which is a genuinely forward-looking capability few competitors publish.

Pros: the fastest keyboard-first client in the category; strong team collaboration with shared conversations, comments and drafts; SOC 2 Type II, SSO, SCIM provisioning, bring-your-own-key and audit logs available; productivity coaching included on every tier.

Cons: the AI features most buyers want sit behind the $33 tier; it is the most expensive per-seat entry point among the dedicated clients other than Shortwave’s upper plans; the rapid rebranding means documentation and third-party reviews are inconsistent about what the product is even called.

4. Inbox Zero — best open-source AI email assistant

Inbox Zero is the only tool in this comparison you can read the source code of and run on your own infrastructure. It is not an email client — it works alongside Gmail, Google Workspace or Outlook, labelling everything automatically, writing pre-drafted replies that wait in your inbox, blocking cold email, and offering one-click bulk unsubscribe for newsletters you never open.

Starter is $18 per user per month and covers labelling, drafting in your voice, cold-email blocking, bulk unsubscribe, email analytics and pre-meeting briefings. Plus at $28 adds two email accounts per user, a Slack integration, email digests, automatic filing of attachments into Google Drive or OneDrive folders, and an unlimited knowledge base. Professional at $42 adds team-wide analytics, priority support and a dedicated onboarding manager. Enterprise covers SSO, SCIM and on-premise deployment. All plans have a 7-day free trial with no card required, and the company offers a 14-day refund window.

One unusual feature: you can work your inbox from Slack or Telegram rather than an email app, with Teams listed as coming soon. Configuration is done in plain English rather than rule builders. Inbox Zero publishes SOC 2 Type 2 certification and states that it does not train AI on your data.

Pros: cheapest credible full AI assistant at $18; self-hosting genuinely available; open source, so the data handling is auditable rather than promised; bulk unsubscribe uses real Gmail filters instead of trapping you in the app.

Cons: the Starter tier includes one email account per user, so two-mailbox users need the $28 plan; it sits alongside your email client rather than improving it, so the reading experience is unchanged; self-hosting is only an advantage if you have someone to run it.

5. Missive — best AI email assistant for shared team inboxes

Missive solves a different problem from the rest of this list: several people working one mailbox. It handles email, SMS via Twilio, WhatsApp, Messenger and Instagram in one place, with internal threads and comments layered beside customer conversations so the team can discuss a reply without forwarding it around.

Starter is $14 per user per month billed yearly and covers up to five users with email, SMS and social accounts, team spaces and SOC 2 Type II compliance. Productive at $24 supports up to 50 users and adds integrations, up to 1,000 rules and automations, basic analytics and API access. Business at $36 is unlimited users and adds SAML SSO, IP restriction, advanced analytics and personalised onboarding. There is a free plan and a 30-day trial with no card required.

Missive’s AI approach is the most flexible here. It supports multiple providers — Anthropic, OpenAI and Gemini — and lets you either use Missive AI credits or bring your own key. It also supports MCP connections to tools such as Stripe, Notion and Linear, plus instant AI drafts, AI rules and automations, translation, conversation summaries and custom prompts. Note that the AI assistant and automations sit on the Productive tier and above, not on $14 Starter.

Pros: lowest team entry price in the comparison; bring-your-own-key avoids paying an AI markup; genuinely multi-channel; each user can connect up to ten personal and five shared accounts.

Cons: the AI assistant is not on the entry tier, so realistic pricing is $24; primarily a web app, which some people dislike for email; overkill if you are one person with one inbox.

6. Spark Mail — cheapest full AI email client

Spark is the value option among true email clients. Plus is $8.25 per user per month billed yearly at $99, and Pro is $16.58 billed yearly at $199. There is a functional free tier. Plus includes the AI assistant with a year of email history, writing assistant, quick replies, summaries, translations and 40 AI meeting notes per month. Pro raises that to unlimited meeting notes, full email history for the assistant, read statuses, HubSpot integration and Spark CLI with triage access.

Be careful with the Pro feature list, though. Workflows, Auto-Labels and Auto-Drafts are all marked “SOON” on Spark’s own pricing page, which means the autonomous drafting capability that competitors ship today is not yet available. If auto-drafting is the reason you are shopping, Spark is not currently the tool — and it is to Spark’s credit that the pricing page says so rather than implying otherwise.

Pros: less than half the price of most rivals; unlimited email accounts even on free; genuine cross-platform sync; team collaboration features on Plus, including shared threads and drafts.

Cons: headline automation features unreleased; AI credits are described as tiered rather than as a published number, so heavy users cannot easily predict where the ceiling is; free-tier AI assistant history is limited to one month.

7. Gemini in Gmail — best AI email assistant if you already pay for Google Workspace

The cheapest AI email assistant for a lot of businesses is the one already included in their subscription. Gemini in Gmail — find, summarise and write emails with AI — is listed as available on every Google Workspace Business tier, including Business Starter. That is a meaningful change from the period when Gemini was a paid add-on.

Business Starter is $7 per user per month on an annual commitment and includes Gemini in Gmail, the Gemini app with basic access, Google Vids and 30 GB pooled storage. Business Standard at $14 unlocks Gemini in Docs, Sheets, Slides, Drive, Meet and Chat, expanded Gemini app access to Google’s most capable models, expanded NotebookLM, and 2 TB. Business Plus is $22 with 5 TB, eDiscovery and Vault. Enterprise is quote-only. Google is currently advertising 50% off the first three months for new customers, and separately notes an introductory price available for the first 20 users for 12 months — read the footnotes, because the $3.50 and $7 figures shown on the page are promotional, not standing prices.

Google also lists Workspace Studio, described as automating your workday with intelligent AI agents, as available across all tiers, plus an “AI Expanded Access” paid add-on for higher limits.

Pros: by far the lowest incremental cost if you are already on Workspace; nothing new to install or trust; Gemini in Gmail now reaches the entry tier.

Cons: Business Starter gets only basic Gemini app access and no Gemini in Docs, Sheets, Meet, Chat or Drive; there is no autonomous drafting or inbox triage comparable to Fyxer or Inbox Zero; Starter, Standard and Plus are capped at 300 users.

8. Microsoft 365 Copilot — best AI email assistant for Outlook-first organisations

Copilot is the Outlook equivalent of the Gemini argument: if your organisation runs on Microsoft 365, the AI assistant in your mail app can be an add-on rather than a new vendor. Copilot summarises email threads and drafts responses inside Outlook, and the same licence covers Word, Excel, PowerPoint and Teams.

The Microsoft 365 Copilot Business add-on is listed at $21 per user per month paid yearly, currently discounted to $18. Microsoft’s own footnote is specific about the terms: the discount runs between July 1, 2026 and September 30, 2026, requires an annual commitment, applies to the first year only, is limited to existing customers on an eligible Business plan, and is not available on trials. Bundled alternatives are Microsoft 365 Business Standard with Copilot at $23.50 per user per month paid yearly, and Business Premium with Copilot at $32, both of which include the underlying Office apps, custom email, 1 TB of storage and Teams.

Copilot Business also includes pre-built agents — Researcher, Analyst and Facilitator — an adoption analytics dashboard, and model choice. A Microsoft 365 Business plan is required before you can buy the add-on at all.

Pros: one licence covers far more than email; deep integration with data already inside your tenant; Copilot Studio for building custom agents; the promotional price is competitive with dedicated email tools.

Cons: the $18 price is first-year-only and expires September 30, 2026, so model your real cost at $21; you cannot buy it standalone; inbox triage is far less aggressive than a purpose-built assistant.

9. MailMaestro — best free AI email assistant tier

MailMaestro, from MaestroLabs, is an add-in for Outlook and Gmail focused squarely on writing. It composes, replies and improves drafts, offers magic templates and an adjustable AI personality, and on paid tiers adds email and attachment summarisation, smart meeting scheduling, an AI priority inbox and email reminders.

The free plan is genuinely free rather than a trial, though it is capped at three compose, reply or improve requests per week combined — enough to evaluate the output quality, not enough to work with. Professional and Team are both $15 per seat per month monthly, or $12 annually with a 20% saving, and paid tiers remove the MailMaestro watermark from your emails. Enterprise adds custom data retention, onboarding and dedicated support. A 14-day full-feature trial is offered.

Read the asterisks carefully: MaestroLabs marks AI Priority Inbox, Email Reminders and Share to MS Teams as exclusive to Microsoft Outlook. Gmail users are buying a smaller product for the same price.

Pros: cheapest paid drafting tool here at $12 annually; a permanent free tier for occasional use; no software to install; the company states it anonymises data before sharing with language models and uses agreements preventing training on private data.

Cons: the free tier adds a MailMaestro watermark to your emails; several headline features are Outlook-only; it writes and summarises but does not manage your inbox the way Fyxer or Inbox Zero do; yearly subscriptions are stated as non-refundable after purchase.

10. SaneBox — best inbox triage tool if you do not want generative AI

SaneBox is the outlier and belongs in this comparison precisely because of that. It does not write emails. It filters them — moving unimportant mail out of your inbox into folders such as SaneLater, catching messages nobody replied to, blocking senders permanently via SaneBlackHole, and sending a daily digest. It works with any IMAP mailbox, so it is the only tool here that does not care which provider you use.

SaneBox’s pricing model is unusual: you pick a plan by number of email accounts and number of features. Snack starts from $4.54 per month, billed $109 every two years, and covers one email account and two features. Lunch starts from $7.46 per month, billed $179 every two years, for two accounts and six features. Dinner starts from $22.04 per month, billed $529 every two years, for four accounts and all features. Monthly and annual billing are available at higher effective rates. The trial is 14 days with all features on up to four accounts, and educational, non-profit and government users can request an additional 25% discount during the trial.

Pros: cheapest entry point in the comparison; provider-agnostic; nothing is sent to a language model to write on your behalf, which sidesteps the main objection people have to AI email tools; features are toggleable per account.

Cons: no drafting, summarising or chat — if you want an assistant that writes, this is not it; the headline price requires a two-year commitment; the feature-allotment model means the low tiers force you to choose which capabilities to give up.

AI Email Assistant Pricing Compared for 2026

Headline prices in this category are rarely like-for-like. Some vendors quote annual-billing rates as the default, some quote monthly, one quotes a two-year commitment, and two are promotional prices with published expiry dates. This table separates them.

Tool	Entry tier	Mid tier	Top published tier	Billing note
SaneBox	Snack from $4.54/mo	Lunch from $7.46/mo	Dinner from $22.04/mo	Lowest rate requires 2-year billing
Google Workspace (Gemini in Gmail)	Starter $7	Standard $14	Plus $22	Annual commitment; intro discounts apply
Spark Mail	Plus $8.25	Pro $16.58	Enterprise (quote)	Billed yearly, $99 and $199
MailMaestro	Free	Professional $12 annual / $15 monthly	Enterprise (quote)	20% annual saving
Missive	Starter $14	Productive $24	Business $36	Billed yearly; AI needs Productive+
Inbox Zero	Starter $18	Plus $28	Professional $42	Annual billing; 7-day trial
Microsoft 365 Copilot	Add-on $18 promo / $21	Business Standard + Copilot $23.50	Business Premium + Copilot $32	Promo ends Sept 30, 2026; first year only
Fyxer AI	Starter $22.50 annual / $30 monthly	Professional $37.50 annual / $50 monthly	Enterprise (quote, 50 seats min.)	25% annual saving; 7-day trial
Superhuman Mail	Starter $25 annual	Business $33 annual	Enterprise (quote)	$300 and $396 per year; AI features are Business tier
Shortwave	Business $30	Premier $45	Max $120	Per seat; 14-day trial

Two traps are worth naming. First, the advertised entry tier is often not the tier with the AI in it — Superhuman’s Auto Drafts and Ask AI are Business-only, and Missive’s AI assistant starts on Productive, not Starter. Second, promotional pricing dominates the built-in options: both Google’s and Microsoft’s most attractive numbers carry published time limits. Model your budget on standing prices.

Native Client, Overlay or Built-In: Which Type of AI Email Assistant Do You Need?

This is the decision that matters more than any feature checklist, because it determines what you have to change about your day.

AI-native email clients — Superhuman Mail, Shortwave, Spark, Missive — replace Gmail or Outlook entirely. The AI has full context of threads, contacts and calendar, and the reading experience itself improves: keyboard shortcuts, split inboxes, bundles, command palettes. The cost is migration. Everyone on the team has to learn a new app, and mobile and desktop habits both change.

Overlays and assistants — Fyxer AI, Inbox Zero, MailMaestro, SaneBox — leave your client alone and work on the mailbox behind it. Drafts appear in your drafts folder; labels appear in Gmail; you keep using the app you already know, on every device, with no rollout. The cost is that email itself does not get any nicer to read, and the assistant only touches what the provider’s API exposes.

Built-in AI — Gemini in Gmail, Microsoft 365 Copilot — is the lowest-friction and lowest-risk option, with no extra vendor touching your mail. It is also the least ambitious: summarising a thread and drafting a reply on request is a long way from an assistant that triages your inbox overnight and has replies waiting. If you already pay for Workspace or Microsoft 365, try what you own before buying anything else. It costs nothing to find out whether it is sufficient.

Best AI Email Assistant for Each Use Case

• Best overall for most professionals: Fyxer AI — works on Gmail and Outlook, drafts without sending, and includes meeting notes in the base price.
• Best for searching years of email: Shortwave — with the caveat that thread caps per search are real and published.
• Best for speed and sales workflows: Superhuman Mail Business at $33, for the CRM integrations, read statuses and MCP server.
• Best value: Inbox Zero at $18, or Spark Plus at $8.25 if you want a full client and can live without auto-drafting for now.
• Best for privacy and control: Inbox Zero, the only self-hostable, open-source option here.
• Best for shared team inboxes: Missive Productive at $24, especially with bring-your-own-key AI.
• Best if you already pay for Google: Gemini in Gmail, included on every Workspace Business tier.
• Best if you already pay for Microsoft: Microsoft 365 Copilot Business, budgeted at the standing $21 rather than the promotional $18.
• Best free option: MailMaestro’s free plan, if three AI requests a week and a watermark are acceptable.
• Best without generative AI: SaneBox, for triage only.

What Changed in the AI Email Assistant Market in 2026

Three shifts explain why older comparison articles are misleading.

Superhuman became a platform, not a product. Grammarly acquired Superhuman on July 1, 2025 and renamed the whole company Superhuman in late October 2025, uniting Grammarly, Coda and the mail client. Coda became Superhuman Docs in July 2026. Buying “Superhuman” now means buying into a suite, which matters for procurement, contract scope and where the roadmap attention goes.

Built-in AI moved down-market. Gemini in Gmail is now listed on Google Workspace Business Starter, the $7 tier. When the cheapest business plan from the largest email provider includes AI writing and summarisation, every paid assistant has to justify itself against something you already have.

Agent interoperability arrived. Superhuman publishes an MCP server on its Business tier and Missive lists MCP connections to Stripe, Notion and Linear. That points at a near-future where your email assistant is a component other AI agents can call, rather than a walled app. If you are choosing a tool you expect to keep for years, published MCP support is worth weighting. Our guide to the best MCP servers for Claude and ChatGPT covers that ecosystem in more depth.

How to Choose an AI Email Assistant

A workflow like this keeps the decision cheap. Start by checking what your existing subscription already includes — if you are on Workspace or Microsoft 365, the assistant may already be switched on. If it is not enough, decide next whether you are willing to change email clients at all, because that single answer removes roughly half of this list. Then check platform support against your actual accounts: several tools here are Gmail-centric, and MailMaestro reserves specific features for Outlook.

After that, confirm the tier. The most common budgeting mistake in this category is pricing the entry plan when the feature you want lives one tier up. Finally, run the trial against real mail rather than a test account — voice matching only becomes assessable once the tool has seen how you actually write. Trials here range from 7 days to 30, so start with the shortest one you are seriously considering.

One security note worth stating plainly: every tool in this comparison except SaneBox needs permission to read your mailbox, and most send message content to a language model. Check each vendor’s published compliance certifications and data-training policy before connecting a work account, and involve whoever owns security at your organisation. Several vendors here publish SOC 2 Type II or Type 2 attestations; that is a floor, not a substitute for reading the data policy.

Related Comparisons Worth Reading

Email is one piece of a wider stack. If meeting follow-up is the real bottleneck, our comparison of the best AI meeting assistants and the head-to-head on Otter vs Fireflies vs Fathom for meeting notes both go deeper than the notetakers bundled into Fyxer and Spark. If dictating replies would save you more time than generating them, see the best AI dictation tools.

For automation beyond the inbox, Zapier vs Make vs n8n covers the platforms that can route email into the rest of your systems, and our roundup of embedded AI tools that work inside apps you already use follows the same “use what you own first” logic applied here. If budget is the binding constraint, the best AI tools under $20 a month includes several picks from this list. You can browse everything in this hub under AI productivity and automation.

Outside this hub, the best AI writing tools comparison is the right next stop if drafting quality matters more to you than inbox triage, Gemini vs ChatGPT vs Claude covers the underlying models several of these assistants run on, and best AI tools for small business owners puts email in the context of a full stack.

Frequently Asked Questions

Pricing, plan names and feature availability in this article were verified against each vendor’s published pricing and documentation pages on July 20, 2026. AI email tools change pricing frequently — confirm current figures with the vendor before purchasing.