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Top 23 Kotlin open-source Projects
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rethink-app
DNS over HTTPS / DNS over Tor / DNSCrypt client, WireGuard proxifier, firewall, and connection tracker for Android.
I've heard good things about RethinkDNS but I've been waiting for integration with Tailscale[0], which doesn't sound entirely trivial[1]. :'-(
[0]: https://github.com/celzero/rethink-app/issues/1047
[1]: https://github.com/tailscale/tailscale/issues/12280
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apkupdater
APKUpdater is an open source tool that simplifies the process of finding updates for your installed apps.
Project mention: F-Droid and Google's Developer Registration Decree | news.ycombinator.com | 2025-09-28 -
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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 -
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)
Keyboard doesn't support swipe, unfortunately: https://github.com/FossifyOrg/Keyboard/issues/94
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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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Notify
📝 Notify is a simple note application build to demonstrate the use of clean MVVM Architecture with Jetpack Compose and Material-3 guidelines along with some Modern Android development tools. (by aritra-tech)
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 note from our sponsor - SaaSHub
www.saashub.com | 15 Jun 2026
Index
What are some of the best open-source open-source projects in Kotlin? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | FlorisBoard | 8,415 |
| 2 | android | 5,397 |
| 3 | rethink-app | 4,973 |
| 4 | Simple-Gallery | 3,971 |
| 5 | apkupdater | 3,839 |
| 6 | Simple-Calendar | 3,632 |
| 7 | Gallery | 3,428 |
| 8 | WeatherMaster | 2,850 |
| 9 | ridesharing-uber-lyft-app | 1,665 |
| 10 | Messages | 1,377 |
| 11 | android-app | 1,026 |
| 12 | android_dbinspector | 953 |
| 13 | Simple-Notes | 868 |
| 14 | otphelper | 853 |
| 15 | talk-android | 720 |
| 16 | Keyboard | 616 |
| 17 | fakeit | 540 |
| 18 | kstatemachine | 498 |
| 19 | Simple-App-Launcher | 454 |
| 20 | Cofi | 441 |
| 21 | Kafka | 386 |
| 22 | Simple-Flashlight | 363 |
| 23 | Notify | 356 |
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