Best AI Email Writing Tools: Gmail, Outlook, and Standalone (2025)

Byaitoolvs

Best AI Tools for Writing Emails in 2025

Email consumes 28% of the average professional workday. AI tools can cut that time in half. Here are the best options for Gmail, Outlook, and standalone use.

TL;DR: For Gmail: Gemini AI (free, built-in). For Outlook: Microsoft Copilot. For any email client: Claude or ChatGPT (copy-paste). For grammar: Grammarly (works everywhere).

Best Options by Email Platform

Gmail Users

Best: Google Gemini (free with Gmail)

Gemini is built directly into Gmail. It can draft replies, summarize threads, and compose new emails. It understands context from your entire email thread.

Outlook Users

Best: Microsoft Copilot ($30/mo with Microsoft 365)

Copilot integrates into Outlook and can draft, reply, summarize, and schedule emails. It also works with Teams, Word, and Excel. See our Copilot vs ChatGPT comparison.

Any Email Client

Best: Claude + Grammarly

Use Claude for drafting and Grammarly for real-time correction. This combination works with any email provider.

AI Email Best Practices

  • Always review AI-generated emails before sending
  • Provide context: paste the email you are replying to
  • Specify tone: professional, friendly, urgent, apologetic
  • Keep it short: AI tends to be verbose — edit down to essentials

Free AI Email Stack

  • Gmail: Gemini built-in (free)
  • Any client: ChatGPT or Claude free tier (copy-paste)
  • Grammar: Grammarly free extension

See also: all AI writing tools and AI tools for freelancers.

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