Alternatives

Products that do what Bolt: A research language with finer-grained concurrency than Rust does

1. 1IA
   Inko – A safe and concurrent object-oriented programming language▲95

   2018 · inko-lang.org

2. 2SA
   Sauron – A web framework in Rust that adheres to the Elm architecture▲305

   2019 · github.com

3. 3VA
   Vector – A High-Performance Log and Metric Router Written in Rust▲322

   2019 · github.com

4. 4HA
   Hydrogen, a multithread non-blocking Linux server framework in Rust▲154

   2016 · github.com

5. 5IA
   Iron, a fast middleware-oriented Rust web server framework▲81

   2014 · github.com

6. 6SA
   Stretch – A high-performance cross-platform layout engine in Rust▲213

   2019 · vislyhq.github.io

7. 7AA
   Arc, an open-source Databricks alternative▲175

   2021 · arc.tripl.ai

8. 8PA
   Polly: A templating language for Rust▲47

   2016 · gitlab.com

9. 9LA
   Lunatic – Actor System for Rust/WebAssembly▲141

   2020 · github.com

10. 10TA
    Thaum, a simple boilerplate and templating command line utility▲79

    2017 · flaque.github.io

11. 11RS
    Rust-starter, a boilerplate to build Rust CLI applications▲97

    2021 · github.com

12. 12KA
    KeyDB – A Multithreaded Fork of Redis▲17

    2019 · github.com

13. 13WM
    wasm-mt – A multithreading library for Rust and WebAssembly▲5

    2020 · github.com

14. 14PF
    Polyphony – Fine-Grained Concurrency for Ruby▲9

    2020 · github.com

15. 15AT
    A thread hierarchy management library in C▲53

    2020 · github.com

16. 16RL
    Rust-Lazy, safe, concurrent lazy evaluation▲6

    2014 · github.com

17. 17SA
    Scar – A programming language for easy concurrency and parallelism▲7

    2025 · scarlang.pages.dev

18. 18AA
    Alan – An implicitly parallel programming language▲47

    2020 · alan-lang.org

19. 19PA
    Prefect – A workflow engine designed for modern data engineering▲59

    2019 · github.com

20. 20GV
    GoLang vs. Python: deep dive into the concurrency▲10

    2018 · made2591.github.io

21. 21CA
    Cuneiform – A Functional Workflow Language▲39

    2016 · cuneiform-lang.org

22. 22AS
    ACM SIGMOD Programming Contest – Optimistic Concurrency Control▲22

    2015 · db.in.tum.de

23. 23CA
    Cachet – A drop-in semantic cache for LLM APIs, 100% local, in Rust▲5

    Jun 2026 · github.com

24. 24TS
    Timber – Structured Logging for Elixir, Ruby and Node▲23

    2017 · timber.io

Ranked by how close each launch is in meaning, then by votes. Refine with a description →