Alternatives

Products that do what Passive Low Pass Filter Calculator does

Design an RC filter

1. 1AD
   All desktop software calculators are wrong, so I had to build my own▲286

   A new calculator software cannot really bring attention (https://chachatelier.fr/chalk/) However, I wrote a full article explaining why I had to build something "new" that does not behave like usual desktop calculator softwares : TL;DR All "small" calculator softwares I know share the same design flaws. And the GUI is not the only stumbling block in their poor efficiency. Handling correctly numerical approximations - expected or not - is crucial to trust the results. It is usually not done in lightweight tools. It should. So I prove that if I could do it, OS manufacturers…

   2022

2. 2PA
   Procal: A simple Qt-based programming calculator▲173

   2023 · github.com

3. 3
   Caligator▲134

   An open-source calculator & convertor that thinks like you

   2019

4. 4
   Subtle Calculator▲110

   A Simple & Gorgeous Android Calculator for Everyday Use

   2021

5. 5
   Calca▲87

   Symbolic calculator

   2014

6. 6
   Webacus▲106

   Swiss-army knife for developers

   2022

7. 7IM
   I made a resistor calculator with TS+React▲20

   2023 · ubavic.rs

8. 8CA
   Calc, a simple command-line calulator in C▲31

   2015 · github.com

9. 9
   Calculator Notepad▲75

   A free-form calculator for Chrome

   2022

10. 10CC
    Concrete Calculator for your weekend projects around the house▲38

    2018 · concretecalculator.io

11. 11VA
    val – An arbitrary precision calculator language▲34

    Wrote this to learn more about the `chumsky` parser combinator library, rustyline, and the `ariadne` error reporting crate. Such a nice DX combo for writing new languages. Still a work in progress, but I thought I'd share :)

    2025 · github.com

12. 12
    SLABreachCalculator.site▲7

    Instant engineering and structural reach calculations.

    Jul 2026 · slabreachcalculator.site

13. 13CA
    calcl – A Programmatic Calculator▲8

    2019 · github.com

14. 14SL
    Simple live calculator in Tree-sitter and cranelift JIT▲29

    2024 · github.com

15. 15
    Electra Calc▲1

    Engineering calculators for PCB, RF & components

    May 2026 · resicalc.com

16. 16KC
    Kalu – Calculator concept for long and inter-linked calculations▲17

    2015 · kushagragour.in

17. 17BS
    bcal – Storage & general-purpose CLI calculator for programmers▲18

    2020 · github.com

18. 18SC
    Sod Calculator▲7

    2023 · sodcalculator.com

19. 19XE
    xxcalc – embeddable floating-point polynomial calculator in Rust▲17

    2016 · github.com

20. 20
    DIYdigits▲9

    Stop guessing. Free calculators for every home project.

    Feb 2026

21. 21
    GitHub▲5

    Minimal calculator built with core web technologies

    Jan 2026

22. 22CC
    Chmod Calculator▲6

    2014 · chmodcalc.com

23. 23
    EngineeringTools▲1

    Precision engineering calculator tools. Fast, free

    Mar 2026

24. 24AC
    ABTestCalculator.com, an open source A/B test significance calculator▲7

    2015 · abtestcalculator.com

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