AI email writing developer tools
Every listing tagged email-writing, A to Z: 8 tools across 1 category. Listed in alphabetical order, not ranked.
Copilot in Outlook
Microsoft's AI in Outlook drafts emails and summarizes long threads. Copilot Chat, including Copilot in Outlook, comes with eligible Microsoft 365 plans at no extra cost; paid Microsoft 365 Copilot extends it across Word, Excel, PowerPoint and Teams, with a one-month free trial. Copilot Business add-on $18 per user a month paid yearly (was $21); Microsoft 365 Business Standard with Copilot $23.50.
Gemini in Gmail
Google's AI assistant inside Gmail for Google Workspace: finds, summarizes and writes emails faster. It comes with every Workspace plan, starting at Business Starter. Business Starter $7 per user a month, $3.50 for new customers' first 12 months on up to 20 users; Business Standard adds Gemini in Docs, Sheets, Meet and Drive. 14-day free trial.
Grammarly
AI writing assistant, now part of Superhuman, that corrects, rewrites and drafts text in your email and the other apps you write in: tone adjustment, unlimited rewrites, AI detection, plagiarism checks and a brand tone, in 20+ languages. Pro adds an Email Assistant that drafts replies and follows up for you. Free with 100 AI prompts a month; Pro $12 per member a month billed annually ($15 monthly) with 2,000 prompts.
Instantly
Cold email platform with an AI Email Writer agent: draft outreach with AI across five major LLMs or your own key, then send it from unlimited connected email accounts with unlimited warmup. Outreach Growth $47 a month for 5,000 emails; Credits, which include the AI Email Writer, from $47 a month; the Starter bundle of both $94, Scale $194 with the AI Reply Agent.
Lavender
AI sales email coach for Gmail and Outlook: scores each email against what gets replies, writes first drafts and adds context on the recipient. Pro connects Outreach, Salesloft, HubSpot, Apollo and Groove. Free Basic plan with 5 email analyses a month; Starter $29 a month or $319 a year, Pro $49 or $539, Teams from $8,500. Free for job seekers and students.
MailMaestro
AI email assistant for Outlook and Gmail from Maestro Labs. Write a short instruction and get three drafts in the tone, length and language you pick, in 20+ languages; it also summarizes threads and attachments, and runs AI agents that label your email, draft replies and follow up. SOC 2 Type II, HIPAA with a BAA on request. Free trial with no card; $12 per seat a month for email, $25 with TeamsMaestro meeting notes.
Shortwave
AI email client for Gmail and Google Workspace with an assistant that searches, organizes and writes. It learns your writing style from sent mail for personalized replies, and adds instant AI replies, predictive autocomplete, AI search, AI filters and MCP integrations. Free with basic AI, 90 days of history and a 'Sent with Shortwave' signature; Pro $18 per seat a month, Business $30, Premier $45, Max $120, billed monthly.
Superhuman Mail
AI-first email client for Gmail and Outlook accounts. Auto Drafts writes replies, follow-ups and scheduling emails in your voice before you open the thread, using context from your inbox, calendar and the web; Write with AI matches your tone, Instant Reply and Auto Summarize clear threads fast, and Write with Voice drafts from speech on mobile. HubSpot, Salesforce and Pipedrive data shows next to each thread. Mail comes in the Superhuman suite with Grammarly, Docs and Go: Business $33 per member a month billed annually ($40 monthly).