Kotlin API

Open-source Kotlin projects categorized as API

Top 18 Kotlin API Projects

  1. Komga

    Media server for comics/mangas/BDs/magazines/eBooks with API, OPDS, Kobo Sync and KOReader Sync support

    Project mention: 5 self-hosted ebook managers worth trying in 2026 | dev.to | 2026-04-17

    Supports: CBZ, CBR, PDF, EPUB Deploy: Docker or standalone JAR Β· komga.org Β· 6k stars

  2. SaaSHub

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

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  3. android-sms-gateway

    The SMS Gateway for Androidβ„’ app enables sending and receiving SMS messages through an API that can be accessed directly on the device or via a cloud server when direct device access is not possible.

    Project mention: Don't Build Multi-Agents | news.ycombinator.com | 2025-09-01

    I am in the USA! Although these days that exclamation point doesn't feel great...

    I'm using an old Android phone (Pixel 2 from 2017), a 5$ a month unlimited SMS plan from Tello, and https://github.com/capcom6/android-sms-gateway. For bonus points (I wanted to roll my own security, route messages from different numbers to prod and ppe instances of my backend, and dedup messages) I built a little service in Go that acts as an intermediary between my backend and android-sms-gateway. I deploy this service to my android device using ADB, android-sms-gateway talks to it, and it talks to my backend. I also rooted the android device so I could disable battery management for all apps (don't do this if you want to walk around with the phone of course). It works pretty well!

    I plan to open-source this eventually TM, but first I need to decouple my personal deployment infra from the bits useful to everyone else

  4. WeatherMaster

    A Weather app for android πŸŒ¦πŸŒžβ˜”

    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

  5. openai-kotlin

    OpenAI API client for Kotlin with multiplatform and coroutines capabilities.

  6. NotyKT πŸ–ŠοΈ

    πŸ“’ NotyKT is a complete πŸ’ŽKotlin-stack (Backend + Android) πŸ“± application built to demonstrate the use of Modern development tools with best practices implementation🦸.

  7. sandwich

    πŸ₯ͺ Sandwich is an adaptable and lightweight sealed API library designed for handling API responses and exceptions in Kotlin for Retrofit, Ktor, and Kotlin Multiplatform.

  8. material-chip-view

    Material Chip view. Can be used as tags for categories, contacts or creating text clouds

  9. zally

    A minimalistic, simple-to-use API linter

  10. UnifiedMetrics

    Fully-featured metrics collection agent for Minecraft servers. Supports Prometheus and InfluxDB. Dashboard included out-of-box.

  11. JRAW

    The Java Reddit API Wrapper

  12. Kanary

    A minimalist web framework for building REST APIs in Kotlin/Java.

  13. Kotlin Spotify Web API

    Spotify Web API wrapper for Kotlin, Java, JS, and Native - Targets JVM, Android, JS (browser), Native (Desktop), and Apple tvOS/iOS. Includes a Spotify Web Playback SDK wrapper for Kotlin/JS, and a spotify-auth wrapper for Kotlin/Android.

  14. cross-device-sdk

    Discontinued The Cross device SDK allows developers to build rich multi-device experiences with a simple and intuitive set of APIs

  15. Gamebaaz

    A full-stack application showing the power πŸ’ͺ of KOTLIN. Entire android app + backend Apis written in Kotlin πŸ”₯

  16. ChatGPT-Java-API

    Unofficial Java API supporting Chat, Assistants, and more!

  17. http-request-kotlin

    🌐 A tiny http client for Kotlin/Android. Only 90 lines of code.

  18. ungh-kt

    Unofficial Kotlin driver for the ungh api

  19. sc-api-kt

    Stalcraft API implementation in Kotlin

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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Kotlin API related posts

  • Don't Build Multi-Agents

    1 project | news.ycombinator.com | 1 Sep 2025
  • Building a subscription tracker Desktop and iOS app with compose multiplatform - Configuring Notion

    3 projects | dev.to | 25 Jun 2024
  • GitHub - mjovanc/github-api: Kotlin wrapper for GitHub API in an object-oriented matter.

    1 project | /r/programmingHungary | 12 Aug 2023
  • GitHub - mjovanc/github-api: Kotlin wrapper for GitHub API in an object-oriented matter.

    1 project | /r/ktor | 11 Aug 2023
  • GitHub - mjovanc/github-api: Kotlin wrapper for GitHub API in an object-oriented matter.

    1 project | /r/webdev | 11 Aug 2023
  • GitHub - mjovanc/github-api: Kotlin Wrapper for GitHub API in an object-oriented matter.

    1 project | /r/webdev | 6 Jul 2023
  • GitHub API library for Kotlin

    1 project | /r/Web_Development | 6 Jul 2023
  • A note from our sponsor - SaaSHub
    www.saashub.com | 6 Jun 2026
    SaaSHub helps you find the best software and product alternatives Learn more β†’

Index

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

# Project Stars
1 Komga 6,322
2 android-sms-gateway 4,519
3 WeatherMaster 2,831
4 openai-kotlin 1,835
5 NotyKT πŸ–ŠοΈ 1,762
6 sandwich 1,759
7 material-chip-view 1,340
8 zally 946
9 UnifiedMetrics 539
10 JRAW 361
11 Kanary 335
12 Kotlin Spotify Web API 216
13 cross-device-sdk 103
14 Gamebaaz 96
15 ChatGPT-Java-API 71
16 http-request-kotlin 11
17 ungh-kt 1
18 sc-api-kt 1

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