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Top 23 Kotlin open-source Projects
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AppSignal
AppSignal knows why the f*#k it crashed. Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
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rethink-app
DNS over HTTPS / DNS over Tor / DNSCrypt client, WireGuard proxifier, firewall, and connection tracker for Android.
Project mention: On non-rooted Android 17, ADB uninstall of system apps fails | news.ycombinator.com | 2026-08-05I use Rethink DNS for this, see (https://github.com/celzero/rethink-app).
Despite it's name it can also block IPs and specific apps from connecting to specific servers. I use it to block all manufacturer and OEM related apps that I cannot uninstall through adb or disable. Very handy for blocking constant Chinese phone telemetry pings, as well as additional network level blocklists for ads (Pi-hole like), completely locally so you can trust it unlike a shady VPN.
I checked out your link; it seems to be a mailing list for a hosts file for telemetry? Why is there no option to just see the file without giving in my email? Not the most private.
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apkupdater
APKUpdater is an open source tool that simplifies the process of finding updates for your installed apps.
I remember Obtainium being PITA to set up, is there any benefit in ObtainX over APKUpdater from rumboalla? Seems to have way more sources.
https://github.com/rumboalla/apkupdater
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Gallery
Browse your memories without any interruptions with this photo and video gallery (by FossifyOrg)
Project mention: No I don't want to turn on Windows Backup with One Drive | news.ycombinator.com | 2025-10-12 -
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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Project mention: A Eulogy for Dark Sky, a Data Visualization Masterpiece (2023) | news.ycombinator.com | 2026-01-10
Breezy Weather and Weather Master right now are IMO the two best open source weather apps on Android
https://github.com/PranshulGG/WeatherMaster
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ridesharing-uber-lyft-app
Ride-Sharing Uber Lyft Android App - Learn to build a ride-sharing Android Taxi Clone App like Uber, Lyft - Open-Source Project
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otphelper
open-source application that can copy OTP and codes from notifications automatically for you
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Keyboard
Easy keyboard for inserting all kinds of texts, special characters and numbers. (by FossifyOrg)
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kstatemachine
A powerful Kotlin Multiplatform state machine library with clean DSL syntax and first-class Kotlin Coroutines support
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Simple-App-Launcher
A simple holder for favourite apps for quick & easy app launcher icon management
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Cofi
Free and open-source coffee brew timer. Customizable time settings and an easy-to-use interface. Perfect cup every time.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
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A group of open source Android apps without ads and unnecessary permissions
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A group of open source Android apps without ads and unnecessary permissions
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A note from our sponsor - AppSignal
www.appsignal.com | 6 Oct 2026
Index
What are some of the best open-source open-source projects in Kotlin? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | FlorisBoard | 8,682 |
| 2 | android | 5,611 |
| 3 | rethink-app | 5,526 |
| 4 | apkupdater | 4,027 |
| 5 | Simple-Gallery | 4,013 |
| 6 | Gallery | 3,748 |
| 7 | Simple-Calendar | 3,652 |
| 8 | WeatherMaster | 3,124 |
| 9 | ridesharing-uber-lyft-app | 1,675 |
| 10 | Messages | 1,572 |
| 11 | android-app | 1,028 |
| 12 | android_dbinspector | 954 |
| 13 | otphelper | 920 |
| 14 | Simple-Notes | 870 |
| 15 | talk-android | 743 |
| 16 | Keyboard | 675 |
| 17 | fakeit | 540 |
| 18 | kstatemachine | 512 |
| 19 | Simple-App-Launcher | 456 |
| 20 | Cofi | 444 |
| 21 | Kafka | 396 |
| 22 | Simple-Flashlight | 368 |
| 23 | timer-machine-android | 365 |
Sponsored
AppSignal knows why the f*#k it crashed.
Stop vibe-debugging. Every exception, every backtrace, grouped so you see patterns, not noise.
www.appsignal.com