No. 12 of 28 ·AI Email Writing Tools

AI Email Assistant for Thunderbird

Extension

Freedom report

Two barsScore 6.2

Free tierA free tier is on its own pricing page
Open codeNo open-source code on record
Runs widely0 of 6 device platforms
DocumentedPlans, terms and facts published

AI Email Assistant for Thunderbird is ranked #12 of 28 in AI email writing tools on Freedom251. It runs on Browser extension. There is a free plan.

AI Email Assistant for Thunderbird plans and pricing

All plans

AI Email Assistant for Thunderbird Free Bring your own API key; AI provider usage may cost extra github.com · 5 Oct 2026

Compared on AI email writing tools

Free plan: Yes
Browser extension: No

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The record

Purpose: A free, open-source Thunderbird extension that adds AI to the email compose window.
Writing tools: It can rewrite selected text, draft a complete email from a description, and suggest three subject lines.
Translation: It translates emails into Polish, English, German, French, Spanish, Ukrainian, and Russian.
AI integrations: Supported providers are Google Gemini, Groq, OpenAI, Anthropic Claude, xAI Grok, OpenRouter, and Ollama.
Local option: Ollama runs locally and is described as 100% free, for complete privacy.
Refinement and access: Users can refine generated text with a comment and access AI actions through the right-click menu or Ctrl+Shift+Space.
History and styles: The extension stores the last 50 operations locally and allows users to add unlimited custom writing styles.
Privacy: The maker says there is no telemetry, analytics, or tracking, and emails are sent only to the AI provider the user chooses.
Key storage: API keys are stored locally and can optionally be encrypted with AES-256-GCM; history is stored locally and never synced to external servers.
License: The project uses the MIT License and is free for personal and commercial use.
Installation: The maker provides a downloadable .xpi file and installation instructions for Thunderbird's Add-ons and Themes menu.
Support and contributions: The maker invites bug reports through GitHub Issues and feature ideas through Discussions, and welcomes pull requests.
Price from: Free

Where it ranks on Freedom251

Best AI Email Writing Tools in 2026#12 of 28

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Sources

github.com/vbamarcin/thunderbird-ai-assistant· checked 5 Oct 2026