Thunderbird is a 100% open source, privacy focused email app.
Thunderbird: Free Your Inbox is a privacy-first, open-source Android email client with a unified inbox option and OpenPGP support. Built on IMAP/POP3, it’s funded by user contributions and remains ad-free, backed by a global open-source community. It ranks well in COMMUNICATION across multiple markets, with 1,000,000+ total downloads and 100K in the last 30 days.
Pros & Cons
Open-source and privacy-first philosophy
Optional Unified Inbox for multi-account productivity
Broad IMAP/POP3 compatibility with major providers
OpenPGP encryption support for secure messaging
Competitors often emphasize accounts management and provider integrations, areas Thunderbird does not foreground
Some users may prefer stronger onboarding or features highlighted by competitors
About Thunderbird: Free Your Inbox
Thunderbird: Free Your Inbox is a communication app developed by Mozilla Thunderbird.
Download Statistics
Thunderbird: Free Your Inbox has been downloaded 2 million times. In the last 30 days, the app was downloaded 100 thousand times. It is ranked in the top 100 communication apps.
User Ratings
Thunderbird: Free Your Inbox is rated 3.77 out of 5 stars. The rating is based on 8.7 thousand ratings.
App Information
Thunderbird: Free Your Inbox is FREE to download. The APK download size is 10.36 MB. The latest version available is 21.0. The last update was on July 20, 2026.
Technical Requirements
The app has a content rating of Everyone. The app has been available on Google Play October 2024.
Description
Thunderbird is a powerful, privacy-focused email app. Effortlessly manage multiple email accounts from one app, with a Unified Inbox option for maximum productivity. Built on open-source technology and supported by a dedicated team of developers alongside a global community of volunteers, Thunderbird never treats your private data as a product. Supported solely by financial contributions from our users, so you never have to see ads mixed in with your emails again.
What you can do
Ditch multiple apps and webmail. Use one app, with an optional Unified Inbox, to power through your day.
Enjoy a privacy-friendly email client that never collects or sells your personal data. We directly connect you to your email provider. That’s it!
Take your privacy to the next level by using OpenPGP email encryption (PGP/MIME) with the “OpenKeychain” app, to encrypt and decrypt your messages.
Choose to sync your email instantly, at set intervals, or on-demand. However you want to check your email, it’s up to you!
Find your important messages using both local and server-side search.
Compatibility
Thunderbird works with IMAP and POP3 protocols, supporting a wide range of email providers, including Gmail, Outlook, Yahoo Mail, iCloud, and more.
Why use Thunderbird
The trusted name in email for over 20 years - now on Android.
Thunderbird is fully funded by voluntary contributions from our users. We don’t mine your personal data. You are never the product.
Made by a team that is as efficiency-minded as you are. We want you to spend minimal time using the app while getting maximum in return.
With contributors from all over the world, Thunderbird for Android has been translated into more than 20 languages.
Supported by MZLA Technologies Corporation, a wholly owned subsidiary of the Mozilla Foundation.
Open Source and Community
Thunderbird is free and open source, which means its code is available to see, modify, use and share freely. Its license also ensures that it will be free forever. You can think of Thunderbird as a gift from thousands of contributors to you.
We develop in the open with regular, transparent updates on our blog and mailing lists.
Our user support is powered by our global community. Find the answers you need, or step into the role of a contributor - whether it’s answering questions, translating the app, or telling your friends and family about Thunderbird.
Recent changes: Thunderbird version 21.0
Changed: - Animation setting now allows On, Off, and System Default options - Modernized 'Fetching mail' account settings screen - Modernized 'Composition defaults' screen
Fixed: - Application could crash due to memory exhaustion - Application could crash when rendering long messages - Inline images were shown as attachments instead of displaying in message - Server search results could disappear - Manage Folders opened the wrong account instead of selected account
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Comments on Thunderbird: Free Your Inbox for Android
★★★★☆Shaun Bowen· Jul 8, 2026
I've just tried Thunderbird again after coming from Type App then Blue Mail before that (both ruined now by updates). I've been pleasantly surprised with how easy and straightforward TB is now. I only have a few suggestions that would earn it 5 stars: 1) Allow cycling through accounts by tapping on the account name at the top. 2) Use each account's highlight color in the list view and top bar to easily show which one you're in.
★★★★★Maydel Fernandez-Alonso· Jul 20, 2026
It works great for my work email. Much better than the Outlook Android app. It automatically detected my configuration from the Thunderbird desktop app, which made the set-up process very smooth.
★★☆☆☆Jeffery Powell· Jun 30, 2026
Never updates inbox without user intervention. If the app isn't open, and you physically refresh, you will not get your email in a timely manner. I was looking to replace Outlook for Android, but this doesn't work for my needs and presumably anyone else's that REQUIRE immediate delivery. Also, no calendar!
★★☆☆☆neil gregory· Jun 18, 2026
Been using it for months, ok for basic emailmduries, but still has no in built spam filtering. Why? I'm sick of the junk mail
★☆☆☆☆Manoj One· Jul 18, 2026
I am using Thunderbird app on desktop. I successfully connected my business emails and using them. However, I am unable to use this mobile app. I can't import settings from the desktop app. When I scan QR code, nothing happened.
★☆☆☆☆David Porter· Jul 3, 2026
This was so close to being a perfect email client, except it IGNORES BOTH SYSTEM font display AND accessibility settings for font size (I have both set to largest), and has no in-app options to increase the font size for reading email message bodies. The font size is EXTREMELY TINY AND CANNOT BE INCREASED. I cannot read the emails in this app. There used to be an option to increase the font size, but it has been removed without any replacement! The developer response below doesn't work.
Google Play Rankings for Thunderbird: Free Your Inbox
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Thunderbird: Free Your Inbox is requesting 17 permissions and is using 55 libraries.
Show details
Trust & Safety: Thunderbird requests standard networking, notification, and device-access permissions essential for email functionality (ACCESS_NETWORK_STATE, INTERNET, POST_NOTIFICATIONS, etc.), plus optional camera and contacts access. The app is open-source and funded by user contributions, maintaining a privacy-first stance with no ads.
Each subscription will automatically renew 3 days before the expiration date for
the same time period. Subscriptions can be cancelled at any time before the renewal.
