Thunderbird for iOS is a ground-up native iPhone app being built in Swift with SwiftUI, designed to bring Thunderbird’s desktop and Android experience to iPhone and iPad with a focus on speed, reliability and a seamless cross-device workflow. The team prioritized clean architecture so core foundations can support rapid feature growth: a fast, automatic account setup flow (including Google and Microsoft), a background sync that keeps inboxes up to date while conserving battery, and a clutter-free inbox plus a modern rich-text editor for everyday email tasks. The codebase is public on GitHub and is reported to be overwhelmingly Swift, underscoring the native approach.
Development is community-centered: an experimental feature-flag system will let contributors and power users test new functionality early, and a planned community test release is due in the coming months. Privacy is emphasized (no tracking or data collection) and standard IMAP support covers Apple Mail accounts. Early user feedback requests include Proton support, robust HTML/image signatures, tag and add-on syncing with desktop, an app-specific passcode, and TestFlight access. A user research survey has already run to help prioritize features.
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