Dev tools · alternatives · 2026

24 alternatives to AsyncNinja

Concurrency library for Swift

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

1. 1
   Code Podcast 3: Concurrency – Event Loop & Coroutines▲54

   Concurrency in UIKits, browsers and web servers

   2016 · its alternatives →

2. 2
   Async UI: A Rust UI Library Where Everything is a Future▲173

   2022 · wishawa.github.io · its alternatives →

3. 3GS
   Go's concurrency features in Swift 2 (Linux ready)▲14

   2015 · github.com · its alternatives →

4. 4NJ
   Nsynjs – JS engine with stoppable threads and without callback hell▲51

   2017 · github.com · its alternatives →

5. 5AA
   Axax – Async iterator extensions for JavaScript▲74

   2018 · github.com · its alternatives →

6. 6
   Ensembles▲66

   Objective-C synchronization framework for apps

   2016 · its alternatives →

7. 7WA
   Whirlwind – Async concurrent hashmap for Rust▲140

   Hey HN, this is Will and David from Fortress (https://news.ycombinator.com/item?id=41426998). We use a lot of async Rust internally, and created this library out of a need for an async-aware concurrent hashmap since there weren’t many available in the Rust ecosystem. Whirlwind is a sharded HashMap with a fully asynchronous API. Just as dashmap is a replacement for std::sync::RwLock, whirlwind aims to be a replacement for tokio::sync::RwLock. It has a similar design and performance characteristics to dashmap, but seems to perform better in read-heavy workloads with tokio's…

   2024 · github.com · its alternatives →

8. 8
   Timekit▲97

   A comprehensive scheduling API (pre-launch)

   2014 · its alternatives →

9. 9CA
   Cancelable async primitives for JavaScript▲84

   2017 · github.com · its alternatives →

10. 10SM
    SyncNinja – Mirroring browser execution on the server▲20

    2015 · github.com · its alternatives →

11. 11PC
    Pure C Asynchronous HTTP Framework▲80

    2022 · github.com · its alternatives →

12. 12AT
    Await-Tree – Visualize Async Rust Task Execution in Real-Time▲28

    2025 · github.com · its alternatives →

13. 13
    Then▲3

    Elegant Async Code in Swift

    2016 · its alternatives →

14. 14TA
    Truck.app – an rsync client for Mac▲33

    2018 · bonhardcomputing.com · its alternatives →

15. 15DC
    Digital Carburetor Synchronizer (C, Swift)▲61

    2020 · github.com · its alternatives →

16. 16SI
    Short Implementation of Goroutines in Swift▲38

    2014 · github.com · its alternatives →

17. 17PA
    Parallel async JavaScript micro library in 25LOC▲7

    2014 · gist.github.com · its alternatives →

18. 18
    AsyncDisplayKit 2.0▲27

    Modernizing iOS Development

    2016 · its alternatives →

19. 19CJ
    Callbaxx.js – A utility library to bring callbacks to synchronous code▲43

    2018 · github.com · its alternatives →

20. 20BF
    ButterflyNet – Fully async networking framework for Python 3.4▲25

    2015 · github.com · its alternatives →

21. 21EC
    Evenk C++ concurrency library▲35

    2015 · github.com · its alternatives →

22. 22NJ
    Node.js async iterators in Real-Time market data feeds▲7

    2019 · docs.tardis.dev · its alternatives →

23. 23CH
    Coseq – high order functions for JavaScript async/sync iterators▲9

    2017 · github.com · its alternatives →

24. 24AA
    Async/await alternative▲17

    2016 · 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 →