Skim

Skim is a free, open-source AI email client for Windows built for people who want a lighter inbox without another subscription. It uses a native Rust core with a Tauri 2 interface, installs as a small Windows app, and focuses on fast local email management instead of becoming a full calendar, contacts, rules, and productivity suite. The app syncs mail over IMAP into a local SQLite database, so search is fast, offline access works, and actions can queue while the network catches up. Skim keeps the interface minimal with keyboard-first navigation, contextual actions, a command palette, instant full-text search, and support for Gmail, Outlook, Yahoo, iCloud, and other standard IMAP or SMTP mailboxes. Skim also includes optional AI features for users who bring their own Anthropic or OpenRouter key. With a key added, it can draft replies in your voice, refine drafts through follow-up instructions, answer questions about individual emails or full threads, summarize unread messages, and search across your mailbox while citing source emails. The strongest fit is a Windows user who wants an offline-first email client with local storage, no telemetry, and simple AI assistance without paying for another hosted inbox product. It is less suitable for teams that need shared mailboxes, complex workflow rules, calendar scheduling, admin controls, mobile apps, or a polished enterprise support contract.