Kotlin open-source

Open-source Kotlin projects categorized as open-source

Top 23 Kotlin open-source Projects

open-source
  1. FlorisBoard

    An open-source keyboard for Android which respects your privacy. Currently in early-beta.

  2. Stream

    Stream - Scalable APIs for Chat, Feeds, Moderation, & Video. Stream helps developers build engaging apps that scale to millions with performant and flexible Chat, Feeds, Moderation, and Video APIs and SDKs powered by a global edge network and enterprise-grade infrastructure.

    Stream logo
  3. rethink-app

    DNS over HTTPS / DNS over Tor / DNSCrypt client, WireGuard proxifier, firewall, and connection tracker for Android.

    Project mention: NetGuard – rootless Android outbound per-app OSS firewall, like LittleSnitch | news.ycombinator.com | 2024-10-23

    Similar but open source: https://github.com/celzero/rethink-app

  4. Simple-Calendar

    A simple calendar with events, tasks, customizable colors, widgets and no ads.

  5. apkupdater

    APKUpdater is an open source tool that simplifies the process of finding updates for your installed apps.

  6. 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

  7. measure

    Measure is an open-source tool to monitor mobile apps. We connect the dots between user actions, app events, network calls, logs, and errors to make debugging production issues easy! (by measure-sh)

    Project mention: Measure–an open-source, self-hosted tool to find patterns and pinpoint cause | news.ycombinator.com | 2025-01-17
  8. InfluxDB

    InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.

    InfluxDB logo
  9. android-app

    The Android app for Noice. (by trynoice)

  10. android_dbinspector

    Android library for viewing, editing and sharing in app databases.

  11. Messages

    An easy and quick way of managing SMS and MMS messages without ads. (by FossifyOrg)

  12. Simple-Notes

    A simple textfield for adding quick notes without ads.

  13. talk-android

    📱😀 Video & audio calls through Nextcloud on Android

  14. otphelper

    open-source application that can copy OTP and codes from notifications automatically for you

  15. fakeit

    The Kotlin fake data generator library! (by thisisqubika)

  16. Simple-App-Launcher

    A simple holder for favourite apps for quick & easy app launcher icon management

  17. kstatemachine

    Powerful Kotlin Multiplatform library with clean DSL syntax for creating complex state machines and statecharts driven by Kotlin Coroutines.

  18. Cofi

    Free and open-source coffee brew timer. Customizable time settings and an easy-to-use interface. Perfect cup every time.

    Project mention: Cofi: Free and open-source coffee brew timer | news.ycombinator.com | 2025-05-01
  19. Keyboard

    Easy keyboard for inserting all kinds of texts, special characters and numbers. (by FossifyOrg)

    Project mention: Fossify – A suite of open-source, ad-free apps | news.ycombinator.com | 2025-06-17

    Keyboard doesn't support swipe, unfortunately: https://github.com/FossifyOrg/Keyboard/issues/94

  20. Simple-Flashlight

    A simple modern flashlight with SOS, stroboscope & bright display, has no ads.

  21. 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)

  22. Kafka

    Read, play, and download millions of books; served by archive.org. (by vipulyaara)

  23. timer-machine-android

    ⏲ A highly customizable interval timer app for Android

  24. retrowars

    Play retro games against each other in any combination in this open source Android multiplayer game.

  25. SaaSHub

    SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives

    SaaSHub logo
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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Index

What are some of the best open-source open-source projects in Kotlin? This list will help you:

# Project Stars
1 FlorisBoard 7,190
2 Simple-Gallery 3,812
3 rethink-app 3,631
4 Simple-Calendar 3,607
5 apkupdater 3,304
6 ridesharing-uber-lyft-app 1,608
7 measure 1,078
8 android-app 966
9 android_dbinspector 962
10 Messages 875
11 Simple-Notes 848
12 talk-android 619
13 otphelper 611
14 fakeit 538
15 Simple-App-Launcher 450
16 kstatemachine 422
17 Cofi 403
18 Keyboard 401
19 Simple-Flashlight 357
20 Notify 352
21 Kafka 341
22 timer-machine-android 266
23 retrowars 223

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