Show HN: TabMail. Open-source AI email for Thunderbird and iPhone

Category: ai-ml

Tags: email, ios, swift, ai-assistant, thunderbird, on-device-ml, imap

Score: 6.3/10 (Innovation: 5, Technical: 7, Documentation: 8, Utility: 5)

TabMail is an open-source AI-native email client for iOS (Swift 6/SwiftUI) and a Thunderbird add-on that adds summaries, drafting, triage, and a chat agent to existing Gmail, Outlook, iCloud, and IMAP accounts. It pairs a fully open iOS client with on-device hybrid keyword+semantic search via Core ML and a vendored sqlite-vec extension, plus crash-safe optimistic sync and BYOK AI routing. It is interesting as a rare example of a production-grade native iOS email client with genuine on-device ML, though the AI orchestration backend remains closed-source.

Target audience: iOS developers, privacy-focused email users, Thunderbird users, mobile client engineers

Repository: https://tabmail.ai/ · Swift · MPL-2.0 · 3 stars

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