Thunderbird for iOS: first look at the native iPhone app in development
The Thunderbird team has published a first look at Thunderbird for iOS, its email app for the iPhone. The app is still in development. According to the team, it is being built natively from scratch rather than reusing existing code, which lets it apply what the team learned from Thunderbird Desktop and Android. The stated ultimate goal is a seamless cross-device experience between desktop and phone.
The post says the team is focused heavily on getting the core foundations right, and that clean architecture now should let it add new features faster later. It stresses that nothing is final and presents the screens and plans as work in progress.
Four areas are described. Setup: login is being made fast, secure and fully automatic, whether the user signs in with a single click or sets up several accounts. Connections: the team is building a background sync that keeps a steady connection with the email provider and keeps the inbox current while respecting battery life. Daily tools: the team is polishing a clutter-free, easy-to-read inbox layout and a clean, modern editor for formatting messages. Growth: the app is structured with clean code and an experimental feature flag system so community developers can contribute, and so power users will be able to test experimental features early.
On timing, the post says only that the goal is a first version ready for community testing in the next few months. The team also ran a user research survey asking people to pick the top three things that matter most to their daily email routine, to help decide what to build after the first release. A note added to the post says the survey has now closed. The closing note thanks users for their patience and speaks of bringing Thunderbird to iPhone and iPad.
The comments add some detail. A reply signed Aly Blenkin, written in the first person plural, says the app's focus is total privacy with no tracking or data collection, that Apple Mail accounts (icloud.com, mac.com, me.com) work through standard IMAP with a password because Apple does not currently offer an OAuth service, and that the app is written in Swift with SwiftUI for views, with the linked GitHub repository (thunderbird/thunderbird-ios) showing 98.9% Swift/SwiftUI. The same name later promises an update on the survey findings and resulting design decisions in the next few weeks. Other commenters ask for Proton support, tag and calendar sync with the desktop app, add-on support, email signatures, an app-specific passcode and custom notification sounds.
Key facts
- Thunderbird for iOS is a native iPhone email app in development, built from scratch rather than reusing existing code.
- The team is working on automatic login, a battery-aware background sync, an inbox layout and a message editor, plus an experimental feature flag system for community contributors.
- The goal is a first version for community testing in the next few months; no concrete release date is given.
- A user survey asking for the top three daily email priorities has closed; a reply in the comments promises findings in the next few weeks.
- Replies in the comments say the app is about 98.9% Swift/SwiftUI and that Apple Mail accounts work via standard IMAP with a password.
Why it matters
Thunderbird has long been available on desktop and Android, and the post notes that many users have been asking for and waiting for an iOS version. This is the first look at the iPhone app, and it shows the project's approach: a fresh native build that reuses lessons from the other Thunderbird apps instead of existing code. The team's stated aim is a seamless experience across desktop and phone.
Who it affects
iPhone users who want Thunderbird on their phone, and existing Thunderbird desktop and Android users who want the same app across devices. Community developers and power users are a named audience too: the feature flag system is meant to let developers contribute and let power users try experimental features early. The post also speaks of bringing Thunderbird to iPad.
How to use it
There is nothing to install yet. The goal is a first version ready for community testing in the next few months. The post gives no concrete release date, and does not say how community testing will be run or how to sign up. The survey linked in the post has closed. Developers can look at the thunderbird/thunderbird-ios GitHub repository, which a reply in the comments links.
How solid is it
This is a first-party post from the Thunderbird team describing its own work in progress, so the plans come straight from the builders. It is a statement of direction rather than a release: the team says nothing is final, and the testing timeline is framed as a goal. The post gives no survey results or number of respondents. Details on language and Apple account support come from comment replies, not from the post body.
Risks and caveats
The timeline is a goal, not a commitment, and "the next few months" is the only timing given. The post does not give a separate timeline for the iPad version. Commenters asked about calendar and tasks, tag sync, add-ons, Proton support and other features; the post itself does not mention calendar, tasks, tags or add-on support, so none of these should be assumed. Pricing and business model are not discussed either.
“Rather than leveraging existing code, we are building natively from scratch.”
— Thunderbird team, Thunderbird blog