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K-9 Alternatives
Similar projects and alternatives to k-9
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InfluxDB
InfluxDB high-performance time series database. Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
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awesome-selfhosted
A list of Free Software network services and web applications which can be hosted on your own servers
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Tutanota makes encryption easy
Tuta is an email service with a strong focus on security and privacy that lets you encrypt emails, contacts and calendar entries on all your devices.
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Signal-Server
Server supporting the Signal Private Messenger applications on Android, Desktop, and iOS
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CodeRabbit
CodeRabbit: AI Code Reviews for Developers. Revolutionize your code reviews with AI. CodeRabbit offers PR summaries, code walkthroughs, 1-click suggestions, and AST-based analysis. Boost productivity and code quality across all major languages with each PR.
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Player
▶ Simple and lightweight, yet polished and powerful Android video player based on ExoPlayer (by moneytoo)
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mobile
Discontinued [Moved to https://github.com/standardnotes/app] Standard Notes for iOS and Android - https://standardnotes.com (by standardnotes)
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Sanmill
Sanmill is an open-source, UCI-like Mill/Morris/Merrills/Mühle/Malom (and its variants) program with CUI, Flutter GUI and Qt GUI, sharing and freely distributing the code, tools and data needed to deliver this mill game. We do this because we are convinced that open software and open data are key ingredients to make rapid progress.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a better k-9 alternative or higher similarity.
k-9 discussion
k-9 reviews and mentions
Posts with mentions or reviews of k-9.
We have used some of these posts to build our list of alternatives
and similar projects. The last one was on 2022-06-13.
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Our Plans for Thunderbird on Android
Yes; this work was started even before the latest FairEmail kerfluffle, and is slated for K-9 6.200.
https://github.com/k9mail/k-9/issues/655#issuecomment-113165...
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For the past 3 months in my spare time I was developing this list with Awesome Android Alternatives! Please check this out, you might find something useful, or maybe you can help me make it even better. Have an awesome day!
Yes, of course you can. I am aware of this app but I have not yet fully tested it. I know about K-9 Mail too. Also not tested.
I agree because I need to test it. I am aware of K-9 Mail and FairMail though.
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Open Source GMail-compatible email apps?
OAuth just got merged 5 days ago for K9-Mail. You just need to wait for a new version to be released, or build the app yourself.
- Add support for OAuth 2.0 (Gmail) by cketti · Pull Request #6082 · k9mail/k-9
- Tell HN: FairEmail terminated after Google falsely flagged as spyware
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FairEmail stopping development after Google falsely flags app as spyware
I don't think K9 supports XOAUTH authentication over IMAP/SMTP yet [0], which is increasingly widely required by mail services.
[0] https://github.com/k9mail/k-9/issues/655
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Forgot my Firefox password so tried doing a reset. Gmail won't let me saying it's a phishing site
K-9 mail is a really good email client for Android as well
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I have no time to check my many email ids and have chosen not to link my phone number with them. Is there any app that can notify me every time I receive an email? (FOSS is preferred)
On mobile if your email provider uses open standards like IMAP/SMTP/POP3 then check out email clients: K-9 mail or FairEmail. I assume you're talking about mobile - otherwise, on desktop I suggest Thunderbird, but there are many options. As an example, Protonmai doesn't work with either of these and does require using their dedicated app.
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K-9 Mail 6.000
> that was otherwise abandoned
What are you talking about? It was never abandoned. That UI redesign took them multiple years and they released several betas over that time period. Just almost nobody bothered to chime in during any of the betas and then everyone started to complain when it got to stable.
https://github.com/k9mail/k-9/graphs/contributors
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A note from our sponsor - InfluxDB
influxdata.com | 19 Apr 2025
Stats
Basic k-9 repo stats
53
6,819
9.7
almost 3 years ago
k9mail/k-9 is an open source project licensed under Apache License 2.0 which is an OSI approved license.
The primary programming language of k-9 is Java.
Sponsored
InfluxDB high-performance time series database
Collect, organize, and act on massive volumes of high-resolution data to power real-time intelligent systems.
influxdata.com