An open-source AI assistant that actually reads your email

What it does

Inbox Zero is an open-source email client that wraps your inbox to draft replies in your tone, auto-file attachments to Google Drive or OneDrive, and surface meeting briefs from your calendar. It also handles inbox hygiene with bulk unsubscribe, bulk archive, and cold-email blocking. If opening another tab feels like too much, you can manage the whole thing through Slack or Telegram.

The interesting bit

Instead of hard-coded filters, you write plain-English “AI Rules” that tell the agent how to handle specific senders or topics. The project is built as a full Next.js application rather than a browser extension, which means it can replace your Gmail tab entirely and run either as a hosted service or a self-hosted stack.

Key highlights

• Drafts replies in your tone and style using AI.
• Plain-English “AI Rules” automate inbox handling without traditional filters.
• Bulk unsubscriber, bulk archiver, and cold-email blocker for inbox cleanup.
• Meeting briefs pulled from email and calendar context before events.
• Self-hostable via CLI, with a hosted version available.

Caveats

• Self-hosting requires OAuth app setup and external service configuration; the CLI wizard is only the entry point.
• Every feature screenshot and the client UI are Gmail-branded, so support for other providers appears unclear despite a Microsoft emulator in local development.

Verdict

Worth a look if you are a developer or productivity tinkerer who wants an AI-native inbox you can customize or host yourself. Skip it if you need a dead-simple, zero-configuration email tool.