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Top 23 Kotlin open-source Projects
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FlorisBoard
An open-source keyboard for Android which respects your privacy. Currently in early-beta.
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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.
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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 | 2024-10-23Similar but open source: https://github.com/celzero/rethink-app
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apkupdater
APKUpdater is an open source tool that simplifies the process of finding updates for your installed apps.
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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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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 -
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.
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otphelper
open-source application that can copy OTP and codes from notifications automatically for you
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Simple-App-Launcher
A simple holder for favourite apps for quick & easy app launcher icon management
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kstatemachine
Powerful Kotlin Multiplatform library with clean DSL syntax for creating complex state machines and statecharts driven by Kotlin Coroutines.
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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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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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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)
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retrowars
Play retro games against each other in any combination in this open source Android multiplayer game.
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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).
Kotlin open-source discussion
Kotlin open-source related posts
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Multiple Russia-Aligned Threat Actors Actively Targeting Signal Messenger
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Does Sony really not have Notes?
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Tibor Kaputa predáva SimpleMobileTools
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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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Memos: A lightweight, self-hosted memo hub
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Contacts Manager
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A note from our sponsor - SaaSHub
www.saashub.com | 12 Jul 2025
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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