10 Best AI Email Writers of 2026

Superhuman Mail is an email client built around speed and AI, and it connects to Gmail and Outlook accounts. Starter, at $25 per member a month billed annually, includes Superhuman AI, team collaboration, calendar and scheduling, and unified billing. Business, at $33 per member a month billed annually with 15% off for teams of 5 or more, adds the company's most advanced AI, auto drafts, Ask AI, custom auto labels, CRM integrations and a Superhuman Mail MCP. Superhuman also sells an Email Assistant that works inside Gmail or Outlook, sorting incoming messages, drafting replies in your voice and reminding you to follow up, so you do not have to switch apps. Split Inbox separates mail from your team, VIPs and tools such as Google Docs and Notion. The trade-off is price: there is no free plan on the pricing page, and the auto drafting that makes it an AI email writer sits on Business. For people who send dozens of emails a day, it is the most complete option we found.

MailMaestro is an AI assistant that sits inside Outlook through the Microsoft Marketplace and inside Gmail through a Chrome extension, and the Flowrite site now says Flowrite is MailMaestro. The Email plan, at $12 per seat a month billed annually, writes, replies to and improves emails, runs unlimited AI agents that label, draft and follow up, and summarizes long threads. Adding TeamsMaestro meeting notes as the MaestroDuo bundle costs $25 per seat a month billed annually at $300 a year, which the vendor says saves $48 compared with buying both. A free plan remains after the 14-day trial of Pro. Maestro Labs lists SOC 2 Type II, GDPR and HIPAA compliance and says your data is never used to train AI models, which matters for legal, finance and HR teams. Annual plans are not refundable, so try the monthly plan first if unsure. For people who do not want to switch email clients, it is the strongest add-in we compared at this price.

Spark is a cross-platform email app from Readdle that connects any number of accounts, from Gmail and Outlook to other providers. The free plan covers Smart Inbox, unlimited email accounts, smart notifications, scheduled sends, snooze and a calendar, but no AI. Plus, at $8.25 per user a month billed yearly or $10 monthly, adds the Spark +AI assistant, 40 AI meeting notes, custom templates, team collaboration and productivity integrations. Pro, at $16.58 a month billed yearly or $20 monthly, adds Autopilot, Auto-Drafts, unlimited AI meeting notes, read statuses and a HubSpot integration. A subscription bought on one device works on Windows, Mac, iPhone and Android. AI usage, including meeting notes, draws from a monthly quota, so heavy users should watch the limit. Readdle offers a seven-day trial of Plus and Pro in the app. For people who want AI writing in a polished email app without paying $25 or more a month, Spark Plus is the cheapest route here.

Grammarly is a writing assistant rather than an email app, so it helps with the wording of a message instead of managing the inbox. The free plan catches spelling and grammar mistakes, shows your tone and allows 100 AI prompts a month to generate text. Pro adds one-click full-sentence rewrites, tone adjustment, fluency suggestions for non-native writers, inclusive language checks, AI text detection, plagiarism checks and 2,000 AI prompts per member a month. Teams on Pro get a style guide, a brand tone, snippets and team analytics. Enterprise, now sold through Superhuman Go, adds unlimited prompts, SAML single sign-on, SCIM and data loss prevention. Grammarly does not organize your inbox or draft replies automatically, so it pairs better with a regular email client. The pricing page here showed euros, so we have marked the USD price as pending.

Microsoft 365 Personal bundles the Outlook, Word, Excel, PowerPoint and OneNote desktop apps with Microsoft Copilot for $9.99 a month or $99.99 a year in the US, which makes it a low-cost way to get AI drafting inside Outlook. The plan is for one person, signs in on five devices at once and includes 1 TB of cloud storage plus identity, data and device security. Copilot chat comes with higher usage than the free tier, and Copilot works in Teams calls too. Microsoft 365 Premium, at $19.99 a month, moves to extensive Copilot usage for heavier writers. At the time of our check Microsoft showed a limited-time discount on the first month or first year. The main limit is scope: it helps people who already write in Outlook and Office, and it does not offer the inbox triage or auto drafts that Superhuman or Fyxer sell. Business users need the separate Microsoft 365 Copilot business plans.

Google puts Gemini directly into Gmail for people on a paid Google AI plan, so there is nothing to install. Google AI Plus includes Gemini in Gmail, 2 TB of storage across Photos, Drive and Gmail, Gemini app access with double the usage limits of a free account and more Gemini Notebook access. Google AI Pro raises storage to 5 TB, adds Gemini in Docs, Vids and other apps, Deep Research and YouTube Premium Lite, and quadruples Gemini app limits. Both plans share storage with up to five others, which spreads the cost across a household. Google notes age limits of 18 and up, language availability and per-session feature limits. The drawback is that Gemini only helps inside Google's own apps, and it is a general assistant rather than an inbox tool with auto drafts and follow-up tracking. The Google One page here showed prices in Polish zloty, so the USD price is marked pending.

Shortwave is an email client that puts an AI assistant at the center. Business, at $30 per seat a month, includes Standard intelligence on Claude Sonnet 4.6, roughly 150 to 300 Standard AI requests a day, AI search over five years of history, three AI-powered filters, attachment analysis, AI memory, saved prompts, instant AI replies and personalized writing that learns your style and tone from the emails you send. Premier, at $45, moves to Advanced intelligence with adaptive thinking, doubles usage and removes the search history limit, and Max, at $120, uses Claude Opus 4.6 with six times the usage. Read statuses, link tracking, snippets, splits and bundles round out the inbox tools. A sister product, Tasklet, can draft replies around the clock and connect to 3,000+ apps. The catch is cost: there is no free plan on the pricing page, so Shortwave is the priciest everyday option here after Fyxer and Jasper.

Fyxer connects to Gmail and Outlook and works in the background: it sorts and labels incoming mail, drafts replies in your tone, records meetings and keeps a running follow-up list. Pro, at $37 per person a month billed annually or $49 monthly, includes drafted replies, notes for every meeting, unlimited personal spaces, three shared spaces per seat and automated Flows. Usage runs on credits, with unlimited credits for the first three months under the launch offer and 3,000 a month per paid member after that; inbox sorting uses one credit per five emails. Team, at $64 billed annually or $99 monthly, adds shared spaces without limits, an organization profile built from team email and meetings, and team reporting. A free plan exists with a weekly email briefing and audio notes, but it does not draft replies. Fyxer is strong for solo operators who want email handled, but it costs about four times Spark Plus.

HyperWrite is a general AI writer rather than an email tool, but its Chrome extension makes it useful in webmail. TypeAheads suggest the next words as you type on any website, and paid plans make them unlimited. Premium, at $16 a month billed annually ($192 a year) or $19.99 monthly, includes 250 AI messages a month, citations with real-time information, three custom personas that help the AI write like you, and a library of hundreds of pre-made tools. Ultra, at $29 a month billed annually or $44.99 monthly, removes the message cap, raises personas to ten and gives early access to experimental features. A free account gets limited monthly credits on the basic AI model. Because HyperWrite does not connect to your inbox, it cannot sort mail, draft replies automatically or remind you to follow up. It fits people who want one writing assistant for email, posts and documents in the browser.

Jasper is a marketing content platform, so it belongs on this list for newsletters, promotional emails and campaign sequences rather than inbox replies. Pro, at $59 per seat a month billed yearly or $69 monthly, includes one seat, the Canvas workspace for on-brand content, agents for core marketing workflows and Jasper IQ customization with two Brand Voices, five Knowledge assets and three Audiences. Business, priced by quote, adds agents for GEO, translation and deep research, a no-code builder for custom agents, Jasper Grid for content at scale, unlimited Brand Voices and Audiences, API access, admin controls and dedicated account management. Pro comes with a seven-day free trial and there is no free plan. Jasper does not connect to Gmail or Outlook as an inbox assistant, so it is a poor fit for everyday replies. Marketing teams that send many campaign emails and care most about brand consistency are the audience.