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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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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 |
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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 |