Life & fun · alternatives · 2026

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Recursi – a recursive memory/logic puzzle launched in 2014; newer entries below may have overtaken it.

1. 1
   Purely Functional Data Structures▲61

   A guide to functional programming

   2016 · amazon.com · its alternatives →

2. 2
   ej▲64

   An 11MB local model for typed decisions in one pass

   13d ago · hitl.systems · its alternatives →

3. 3
   Reika▲72

   A coding agent CLI designed around small local models first

   15d ago · reikacode.com · its alternatives →

4. 4
   Re/code Decode - Y Combinator's Sam Altman▲92

   and the internet of things and Google

   2015 · serve.castfire.com · its alternatives →

5. 5
   X – A programming language with switchable memory modes▲5

   Jun 2026 · github.com · its alternatives →

6. 6HB
   Heap-Based Quicksort, Visualized▲7

   2014 · quicksort-heap.herokuapp.com · its alternatives →

7. 7
   A Golang library to build Turing machine▲6

   2019 · made2591.github.io · its alternatives →

8. 8
   Lambda Lessons▲6

   Pattern-matching, first-class functions, and more in Haskell

   2014 · stevekrouse.github.io · its alternatives →

9. 9
   Recursive acknowledgment pattern▲5

   2016 · github.com · its alternatives →

10. 10RR
    RDBTools – Redis Memory Analyzer▲9

    2018 · rdbtools.com · its alternatives →

11. 11
    Passambler: A toy language I made in Java over the course of 4 months▲5

    2015 · github.com · its alternatives →

12. 12
    Boolr▲5

    A digital logic simulator

    2017 · boolr.me · its alternatives →

13. 13
    Scar – A programming language for easy concurrency and parallelism▲7

    2025 · scarlang.pages.dev · its alternatives →

14. 14
    Nirvana, a WIP programming language▲8

    2018 · github.com · its alternatives →

15. 15TY
    The Y Combinator Codex▲8

    2021 · phoe.github.io · its alternatives →

16. 16
    A REPL for practising bitwise operations, written in Rust▲5

    2017 · github.com · its alternatives →

17. 17FA
    Ferret – A Hard Real-Time Clojure for Lisp Machines▲7

    2016 · nakkaya.com · its alternatives →

18. 18PS
    PDRT-Sandbox: A Haskell NLP Library for Computational Semantics▲7

    2014 · hbrouwer.github.io · its alternatives →

19. 19
    Adas.ana – clojure productivity macros, a novel take on anaphoras▲5

    2018 · github.com · its alternatives →

20. 20CF
    Conduit for C++: Lazy Sequences Using the Coroutine TS▲7

    2018 · medium.com · its alternatives →

21. 21PA
    Philip2 – an Elm-to-OCaml compiler▲8

    2019 · medium.com · its alternatives →

22. 22AV
    A very simple Lisp interpreter in 250 lines of literate Python▲5

    2017 · khamidou.com · its alternatives →

23. 23IA
    Implementing a Lispy Language in Haskell: Part 1▲6

    Software Engineer in New York specializing in Apple platforms

    2015 · harlanhaskins.com · its alternatives →

24. 24DI
    DataInStructures, interactive analysis of data structures▲6

    2016 · joshuablaine.github.io · 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 →