Dev tools · alternatives · 2026

24 alternatives to Ktfmt, a Kotlin code formatter powered by Google-Java-format

A program that reformats Kotlin source code to comply with the common community standard for Kotlin code conventions. - Kotlin/ktfmt

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Ktfmt, a Kotlin code formatter powered by Google-Java-format launched in 2019; newer entries below may have overtaken it.

1. 1KA
   Konty – A Balsamiq-alternative lo-fi wireframe tool for modern apps▲392

   2024 · konty.app · its alternatives →

2. 2
   Komment▲360

   Make sense of messy code

   2025 · komment.ai · its alternatives →

3. 3
   Kotlin Money▲427

   Manipulating monetary amounts is a common computing chore. However, no mainstream language has a first-class data type for representing money, it’s up to programmers to code abstractions for it. This isn’t an issue per se until dealing with rounding issues from operations like installment payments (e.g., buy now, pay later), foreign exchange, or even simple things like fee processing and tax collection. Inspired by my days at N26 Brasil dealing with these challenges, I introduce Money: a Kotlin library that makes monetary calculations and allocations easy.

   2024 · blog.eriksen.com.br · its alternatives →

4. 4
   I finished v5 of a JVM framework I've spent spent half a decade making▲377

   ForewordJavalin is a Java and Kotlin web framework which focuses on simplicity and Java/Kotlin interoperability.It supports WebSockets and HTTP3, and it uses...

   2022 · javalin.io · its alternatives →

5. 5
   Kobra▲146

   Visual programming for machine learning, like Scratch

   2021 · kobra.dev · its alternatives →

6. 6
   Kotlin▲3

   Statically typed programming language targeting the Java /JS

   2015 · kotlinlang.org · its alternatives →

7. 7FS
   Fuse – statically typed functional programming language▲121

   Hi HN! I've been working on the fuse programming language, it's a statically typed purely functional language with higher-kinder types and ad-hoc polymorphism. It compiles to the GRIN whole-program optimizer, producing LLVM-generated native code. Fuse supports ADTs, Generics, Type Methods, Traits, Pattern matching etc. all in a functional style with no mutations. I’ve been developing the language for 5 years, with code written in Scala. I’ve started coding the language from the base of System F that was implemented as part of the book: Types and Programming Languages (tapl). And then…

   Aug 2026 · fuselang.org · its alternatives →

8. 8
   Kodus▲145

   Hey everyone, Just wanted to share a quick update we just launched at Kodus. For those who don’t know it yet, Kodus is a code review agent that runs directly in your team’s Git workflow (GitHub, GitLab, Bitbucket… and now Azure DevOps as well). It helps maintain code quality and consistency by analyzing each PR based on your team’s own rules and repository standards. Support for Azure had been a common request — so if your team uses it, you can now plug Kodus right into your workflow and give it a try. Docs: https://docs.kodus.io/how_to_use/en/overview Repo:…

   Oct 2025 · kodus.io · its alternatives →

9. 9
   LeetCode Code Format▲74

   Adds format code button on Leetcode to format the code

   2020 · chromewebstore.google.com · its alternatives →

10. 10
    Openleetcode – Local LeetCode runner where tests live in the repo▲73

    You write a standard solution, just like on LeetCode, and run it through the CLI. It identifies the problem by ID or title, executes your code against local test cases, and shows the result. It currently supports around 1.4k problems and multiple languages, including Python, C++, Rust, Java, Go, TypeScript, Swift, and others. The project is still an MVP. System design, SQL, and concurrency problems are not supported yet, but support for more problem types is planned. Made in Haskell!

    Aug 2026 · github.com · its alternatives →

11. 11
    JSPretty▲78

    Javascript Beautifier and Formatter

    2014 · cleancss.com · its alternatives →

12. 12
    Kotlin multiplatform smaple▲3

    Kotlin, multiplatform, mobile application

    2020 · github.com · its alternatives →

13. 13
    Http4k: Server as a Function. In Kotlin. Typesafe. Without the Server▲29

    An overview of the Kotlin

    2017 · http4k.org · its alternatives →

14. 14
    Codec-beam – Generate Erlang VM byte code from Haskell▲53

    Generate Erlang VM byte code from Haskell. Contribute to kofigumbs/codec-beam development by creating an account on GitHub.

    2018 · github.com · its alternatives →

15. 15
    My first open-source project release – RandomJson▲56

    Provides a Kotlin/Java library to create a random json string - mangatmodi/RandomJson

    2019 · github.com · its alternatives →

16. 16
    Jesth – Next-level human-readable data serialization format▲38

    Hi HN! I'm Alex, a tech enthusiast. I'm excited to show you Jesth, a next-level human-readable data serialization format. This project started out as a markup language for writing the docstrings of functions that would ultimately be consumed by a documentation generator. Basically the idea was to split a docstring into sections like Description and Parameters. Each section would consist of a header in square brackets and a body (lines of text between two headers). Here's what a docstring for a sum function would look like: This function takes in two integers a and b and returns their sum.…

    2023 · github.com · its alternatives →

17. 17
    Kotlin 1.0▲6

    Pragmatic programming language for JVM and Android

    2016 · blog.jetbrains.com · its alternatives →

18. 18
    Javalin, a Java/Kotlin REST API Framework▲50

    Javalin - A lightweight Java and Kotlin web framework. Create REST APIs in Java or Kotlin easily.

    2017 · javalin.io · its alternatives →

19. 19
    Format – a Swift 2.0 formatting kit▲22

    A Swift Formatter Kit. Contribute to marmelroy/Format development by creating an account on GitHub.

    2015 · github.com · its alternatives →

20. 20
    KReact, a Kotlin Redux-like framework for application state management▲7

    This library provides a Redux-like implementation in pure Kotlin and coroutines. - kreact/kreact

    2023 · github.com · its alternatives →

21. 21MO
    Minimalist Open Source JSON formatter app▲13

    Minimalist json formatter, minifier & editor

    2020 · jsonformatter.live · its alternatives →

22. 22
    Mosaic – A Kotlin framework for cleaner back end code▲25

    Backend APIs often grow into large orchestration classes full of duplicated calls and manual concurrency. I’ve been working on Mosaic, a Kotlin framework that composes responses out of small, request-scoped “tiles.” Each tile runs once per request, dependencies resolve automatically, and independent tiles execute in parallel without boilerplate. It’s still early (v0.2.0), but working today for caching, concurrency, and testability. Curious to hear feedback on the approach. GitHub: https://github.com/Nick-Abbott/Mosaic Maven Central: org.buildmosaic:mosaic-core:0.2.0

    2025 · github.com · its alternatives →

23. 23CF
    Code Formatting API▲7

    2018 · neutron64.com · its alternatives →

24. 24
    KAppMaker▲16

    Hey HN, I built KAppMaker, a Kotlin Multiplatform boilerplate that helps you launch iOS and Android apps quickly. I know the boilerplate space is pretty saturated, but after publishing two open-source Kotlin Multiplatform libraries (KMPNotifier and KMPAuth), and seeing how much manual work goes into app setup, I realized something had to change. Each time I started a new app, I spent at least 4-5 days just setting up basics like authentication, notifications, and in-app purchases—before even getting to the core feature. To speed up this process, I created KAppMaker, a boilerplate that…

    2024 · kappmaker.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →