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. Chmod Calculator launched in 2014; newer entries below may have overtaken it.

1. 1
   Chmod Command Calculator▲116

   Easiest way to generate file or directory permissions

   2017 · chmodcommand.com · its alternatives →

2. 2
   KnightOS▲136

   An open-source OS for calculators

   2016 · its alternatives →

3. 3
   Best Chmod Calculator Ever (stupid Simple)▲9

   Quickly generate permissions in numerical and symbolic formats. All options included (recursive, sticky, etc). Ready to copy paste to your terminal in seconds.

   2017 · chmodcommand.com · its alternatives →

4. 4CA
   Chebyshev approximation calculator▲278

   Hi everyone, here's a web app I made that generates code for efficiently approximating mathematical functions. This is useful when performance matters more than perfect accuracy, for example in embedded systems. The app uses Chebyshev expansions, which despite their theoretical depth result in suprisingly compact and readable code in practice. This code is generated for you and using it does not require any knowledge of the underlying theory. Source code and more info: https://github.com/stuffmatic/chebyshev-calculator

   2024 · stuffmatic.com · its alternatives →

5. 5TS
   The Surprisal Calculator WM±7▲6

   2025 · surprisal.onrender.com · its alternatives →

6. 6
   Calcbot▲111

   The intelligent calculator and unit converter by Tapbots

   2014 · tapbots.com · its alternatives →

7. 7IS
   Information Silo Calculator▲9

   2017 · datasilos.org · its alternatives →

8. 8
   Calca▲87

   Symbolic calculator

   2014 · calca.io · its alternatives →

9. 9
   Numerical▲70

   Calculator Without Equal

   2014 · its alternatives →

10. 10SC
    Simple calculator, try urlcalc.com/1+2▲5

    2015 · urlcalc.com · its alternatives →

11. 11
    One Button Calculator (Morse code Python REPL)▲6

    2023 · punkx.org · its alternatives →

12. 12NS
    Notepad Style Online Calculator▲6

    2020 · type-calc.herokuapp.com · its alternatives →

13. 13UE
    User Engagement Calculator▲7

    2014 · userengagementcalculator.com · its alternatives →

14. 14
    Rizon▲25

    A beautiful Golden Hour calculator for iOS

    2015 · reiseversicherung.de.com · its alternatives →

15. 15
    Coffee to Water Ratio Calculator▲7

    2019 · honestcoffeeguide.com · its alternatives →

16. 16CA
    CALX, a gestural RPN calculator for iOS▲5

    2015 · protonome.com · its alternatives →

17. 17
    Mec.py Mathematical Expression Calculator▲7

    2020 · github.com · its alternatives →

18. 18PG
    Payment Gateway Calculator▲8

    2019 · founderhacker.com · its alternatives →

19. 19
    A minimal calculator app that demonstrates the microservices concept▲7

    2018 · github.com · its alternatives →

20. 20AJ
    A JavaScript calculator using the latest ES6 features▲7

    2017 · calculator.portfolio.braham.biz · its alternatives →

21. 21PB
    PalWorld Breeding Calculator▲9

    2024 · paldb.net · its alternatives →

22. 22AC
    A collection of tiny web tools and calculators▲5

    2022 · thetinytools.com · its alternatives →

23. 23DC
    Distance Calculator (weekend experiment)▲5

    2014 · distancecalculator.me · its alternatives →

24. 24TE
    tarsnap estimated cost calculator▲5

    2014 · cdn.rawgit.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 →