Welcoming Repositories Index Kotlin Ecosystem
Top Welcoming Open-Source Kotlin Repositories
Top welcoming Kotlin repositories. Scored by real 90-day external PR merge rates, maintainer review turnaround speed, and first-time contributor success.
Updated daily • Thu, 15 Oct 2026 UTC
Tracked Repos
4,369
>100 stars verified
Avg Merge Rate
85%
90-day external PRs
Open GFIs
102
Beginner friendly issues
Welcoming Tier
50
S & A Tier maintainers
Ranked Kotlin Repositories
Showing top 50 of 4,369 ranked repositories
| Rank | Repository | Tier | Score | Merge Rate | Good First Issues |
|---|---|---|---|---|---|
| #1 | Bring the native Dynamic Island experience to HyperOS. Bridges android notifications into HyperIslands. | S•Elite | 75.0 | 65.0% | 4 |
| #2 | sameerasw/essentials3,271 Essential tools and mods for Android nerds | S•Elite | 73.6 | 79.6% | 24 |
| #3 | S•Elite | 73.5 | 79.0% | 2 | |
| #4 | AI desktop app for chat, RAG, Skills, MCP tools, and agents. Support multiple LLMs (Anthropic, OpenAI, VertexAI, vLLM, Nvidia NIM, Gemini, OpenRouter) | S•Elite | 73.3 | 87.0% | 5 |
| #5 | WebDAV (including CalDAV, CardDAV) library for the Java virtual machine (Java/Kotlin) | S•Elite | 73.0 | 93.8% | - |
| #6 | square/leakcanary30,000 A memory leak detection library for Android. | S•Elite | 72.7 | 83.0% | - |
| #7 | Modular UI components for Jetpack Compose | S•Elite | 72.6 | 100.0% | - |
| #8 | Comprehensive Bitcoin development library for Android, implemented on Kotlin. SPV wallet implementation for Bitcoin, Bitcoin Cash, Litecoin and Dash blockchains. Fully compliant with existing standards and BIPs. | S•Elite | 71.7 | 94.1% | - |
| #9 | A rich text editor engine for Compose Multiplatform, targeting Android, iOS, Web (Wasm/JS), and Desktop (JVM). Built on a rope-backed piece-table architecture for efficient O(log n) text editing, it supports formatting (bold, italic, underline, strikethrough, highlight), links, colors, headings, ordered/bullet/task lists, and blockquotes. | S•Elite | 71.5 | 98.7% | - |
| #10 | Vocable for Android | S•Elite | 71.3 | 86.7% | - |
| #11 | Android SMS app ~ Featuring E2EE, Cloud Forwarding, RMQ integrations | S•Elite | 71.3 | 89.3% | - |
| #12 | ankidroid/Anki-Android11,999 AnkiDroid: Anki flashcards on Android. Your secret trick to achieve superhuman information retention. | S•Elite | 70.2 | 70.7% | 19 |
| #13 | Nostr client for Android | S•Elite | 70.2 | 93.0% | - |
| #14 | kDrive application for Android | S•Elite | 70.1 | 70.6% | - |
| #15 | Native desktop platform for the JVM. Compose Multiplatform apps with real OS integration — native window decorations, notifications, taskbar and dock, code signing, installers, auto-update — packaged for macOS, Windows and Linux from a single Gradle DSL. Runs on the JVM or as a GraalVM native image. | S•Elite | 69.9 | 82.9% | 1 |
| #16 | Monochrome outlined brand icons for Android launchers. | S•Elite | 69.9 | 85.2% | - |
| #17 | 掌上重邮——重庆邮电大学首款整合校园与生活的App | A•Welcoming | 69.9 | 84.6% | - |
| #18 | The Pachli Android app | A•Welcoming | 69.7 | 95.3% | 1 |
| #19 | Sky Map (formerly Google Sky Map, open sourced in 2012) | A•Welcoming | 69.6 | 84.2% | - |
| #20 | An implementation of the OpenTelemetry specification as a Kotlin Multiplatform Library | S•Elite | 69.4 | 77.8% | 30 |
| #21 | rawnaldclark/Stash1,185 Your Spotify + YouTube Music library & daily mixes. Free and open source forever. | S•Elite | 69.3 | 77.3% | 3 |
| #22 | Native Android app for Hermes Agent. Your agent, in your pocket. | S•Elite | 69.3 | 79.7% | - |
| #23 | Private photo vault for Android | S•Elite | 69.3 | 92.7% | 1 |
| #24 | ximeiorg/Xime1,194 我的自用安卓输入法，基于Rime 构建，部分功能由本人设计的本地AI模型驱动，支持五笔/拼音/自定义方案。 | S•Elite | 69.1 | 92.0% | - |
| #25 | libre-tube/LibreTube12,802 An alternative frontend for YouTube, for Android. | S•Elite | 69.0 | 77.9% | 3 |
| #26 | jitsi/jibri667 Jitsi BRoadcasting Infrastructure | A•Welcoming | 68.8 | 88.6% | - |
| #27 | duckduckgo/Android4,850 DuckDuckGo Android App | A•Welcoming | 68.6 | 85.7% | - |
| #28 | Kotlin/dataframe1,068 Kotlin DataFrame: typesafe in-memory structured data processing for JVM | A•Welcoming | 68.5 | 77.2% | 1 |
| #29 | スミレ - 完全オフラインの日本語キーボードアプリ | S•Elite | 68.5 | 84.6% | - |
| #30 | Register, calculate and make reminders for your recurring expenses alongside credit card due dates. | A•Welcoming | 68.4 | 91.1% | - |
| #31 | Custom PokeMMO server. Archived after formal request from PokeMMO. | A•Welcoming | 68.3 | 78.4% | - |
| #32 | Android application for analyzing installed apps | A•Welcoming | 68.3 | 93.8% | - |
| #33 | Non-Root Android performance overlay featuring live FPS meter, thermal diagnostics, and privileged gaming optimization via Shizuku. | A•Welcoming | 68.1 | 91.3% | - |
| #34 | A modern Android video player powered by libmpv, built with Jetpack Compose. | A•Welcoming | 68.1 | 85.9% | - |
| #35 | Immortal — a custom launcher, photo-frame screensaver, and on-device app store that revives discontinued Meta Portal devices. | A•Welcoming | 68.0 | 81.4% | - |
| #36 | Cross-device clipboard sync for macOS, Windows & Linux — end-to-end encrypted, LAN-only, no cloud. OCR, CLI and MCP server built in. | A•Welcoming | 68.0 | 85.8% | - |
| #37 | An internet radio player for Android | A•Welcoming | 68.0 | 84.7% | - |
| #38 | A Sentry SDK for Java, Android and other JVM languages. | A•Welcoming | 68.0 | 66.5% | 3 |
| #39 | Authoring GitHub Actions workflows in Kotlin. You won't go back to YAML! | A•Welcoming | 67.7 | 94.7% | - |
| #40 | An Android app that uses your phone's sensors to assist with wilderness treks or survival situations. | A•Welcoming | 67.7 | 95.4% | - |
| #41 | An Android app that supplies Quick Settings tiles for toggling system preferences. It currently offers Private DNS (Off/Auto/Different Hostnames) and USB Debugging (On/Off) with optional auto-revert. | A•Welcoming | 67.6 | 100.0% | - |
| #42 | Visualize your year in travel using your Google Location History (Timeline) data | A•Welcoming | 67.6 | 77.9% | - |
| #43 | 📱The official Wikipedia app for Android! | A•Welcoming | 67.5 | 82.0% | - |
| #44 | google/ksp3,480 Kotlin Symbol Processing API | A•Welcoming | 67.5 | 75.0% | 3 |
| #45 | Your Open Autonomous Android Agent — A production-ready, self-planning AI assistant powered by local/remote LLMs and accessibility-driven screen automation. | A•Welcoming | 67.4 | 92.0% | - |
| #46 | Datadog SDK for Android (Compatible with Kotlin and Java) | A•Welcoming | 67.4 | 80.6% | - |
| #47 | An Android native video player | A•Welcoming | 67.3 | 70.3% | 1 |
| #48 | A Minecraft: Java Edition Launcher for Android | A•Welcoming | 67.3 | 81.8% | - |
| #49 | A Compose Multiplatform library which provides a modifier for display 'placeholder' UI while content is loading. | A•Welcoming | 67.1 | 98.4% | - |
| #50 | ZacSweers/metro1,408 A multiplatform, compile-time dependency injection framework for Kotlin | A•Welcoming | 67.1 | 91.9% | 1 |
How to Get Your Kotlin PR Merged
1
Check C-Rank™ First: Pick projects with S or A tiers to avoid maintainer ghosts and slow review cycles.
2
Run Local Verification: Ensure test suites and formatting linters pass before opening a pull request.
3
Submit in Maintainer Windows: Check the repository report card to submit when maintainers are most active.
Top Kotlin Frameworks & Stacks
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Frequently Asked Questions: Kotlin Open Source
What is the most welcoming Kotlin open-source repository?
The highest-ranked Kotlin repository on GetMerged is currently D4vidDf/HyperBridge, with a C-Rank score of 75.0/100 and a 65.0% PR merge rate.
How can I find good first issues in Kotlin?
You can browse verified beginner-friendly issues in Kotlin by visiting our curated Good First Issues directory at getmerged.abhishekco.de/good-first-issue/kotlin.
What makes a Kotlin repository ‘Super Welcoming’ on GetMerged?
A ‘Super Welcoming’ (S-Tier) Kotlin repository demonstrates an external PR merge rate above 80%, a median first response time within 24 to 48 hours, active review feedback, and clear onboarding documentation.