Dev tools · alternatives · 2026

24 alternatives to Then

Elegant Async Code in Swift

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Then launched in 2016; newer entries below may have overtaken it.

1. 1
   Async UI: A Rust UI Library Where Everything is a Future▲173

   2022 · wishawa.github.io · its alternatives →

2. 2
   IBM Swift Sandbox▲298

   Write & test Swift code in your browser

   2015 · its alternatives →

3. 3
   AsyncNinja▲5

   Concurrency library for Swift

   2016 · its alternatives →

4. 4AA
   Async/await alternative▲17

   2016 · github.com · its alternatives →

5. 5
   Waitasecond▲60

   Elegant JavaScript or TypeScript promises

   2023 · its alternatives →

6. 6SL
   Swifty – Learn to code in Swift▲108

   2015 · swifty-app.com · its alternatives →

7. 7
   Swift Guides▲82

   The Best Way to Learn Swift Development

   2014 · its alternatives →

8. 8
   LearnSwift.tips▲138

   Swift Tutorials, Code Samples, References and more!

   2014 · its alternatives →

9. 9AA
   Axax – Async iterator extensions for JavaScript▲74

   2018 · github.com · its alternatives →

10. 10
    Render▲169

    React-inspired Swift library for writing UIKit UIs

    2016 · its alternatives →

11. 11CA
    Cancelable async primitives for JavaScript▲84

    2017 · github.com · its alternatives →

12. 12KT
    Kneden – Transpile ES7 Async/await to ES6 Promise Chains (Babel Plugin)▲76

    2016 · github.com · its alternatives →

13. 13
    AsyncDisplayKit 2.0▲27

    Modernizing iOS Development

    2016 · its alternatives →

14. 14
    RunSwift▲134

    Try Swift in Your Browser

    2014 · its alternatives →

15. 15CA
    Codebeat – automated code review for Swift▲68

    2016 · codebeat.co · its alternatives →

16. 16
    The REST & JSON in Swift Bundle▲57

    Learn to build REST apps in Swift

    2016 · its alternatives →

17. 17AC
    Async – Claude code and Linear and GitHub PRs in one opinionated tool▲107

    Hi, I’m Mikkel and I’m building Async, an open-sourced developer tool that combines AI coding with task management and code review. What Async does: - Automatically researches coding tasks, asks clarifying questions, then executes code changes in the cloud - Breaks work into reviewable subtasks with stack diffs for easier code review - Handles the full workflow from issue to merged PR without leaving the app Demo here: https://youtu.be/98k42b8GF4s?si=Azf3FIWAbpsXxk3_ I’ve been working as a developer for over a decade now. I’ve tried all sorts of AI tools out there including…

    2025 · github.com · its alternatives →

18. 18AT
    Async Transducers with Promises▲5

    2014 · github.com · its alternatives →

19. 19SI
    Short Implementation of Goroutines in Swift▲38

    2014 · github.com · its alternatives →

20. 20PO
    Proof-of-concept Node.JS-like interface with iOS 7 JavaScriptCore▲30

    2013 · github.com · its alternatives →

21. 21
    Perfect▲9

    Use Swift for all of your server-side and client-side apps

    2015 · its alternatives →

22. 22MA
    Mastering Async JavaScript - learn async JS through live examples▲8

    2018 · frontarm.com · its alternatives →

23. 23CJ
    Channel.js – the missing class for creating safe async iterators▲6

    2019 · github.com · its alternatives →

24. 24DR
    Django REST Framework Async▲6

    2022 · github.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 →