Dev tools · alternatives · 2026
24 alternatives to Fcal
Open source cross platform calculator for programmers
Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Fcal launched in 2020; newer entries below may have overtaken it.
- 1
Extensive math expression evaluator library for JavaScript and Node.js - 5anthosh/fcal
2020 · github.com · its alternatives →
- 2
I launched NumPad v1 on here a few years ago, and back then it wasn't much more than a thin CodeMirror wrapper around the calculator engine I'd written. Now I've rewritten it as a PWA that supports multiple documents, persists them to IndexedDB, and has a syncing service for paying customers. Syncing is handled by Automerge[1] under the hood, which should make it relatively easy to get document sharing working too. [1] https://automerge.org/
2022 · numpad.io · its alternatives →
- 3
- 4
- 5
:1234: Bits, bytes and general-purpose calculator. Contribute to jarun/bcal development by creating an account on GitHub.
2020 · github.com · its alternatives →
- 6
Hissab▲108Hissab is a strict, unit-aware natural-language calculator for exact units, dates, finance, developer math, and AI-agent workflows. Free, open-source, and installable.
2023 · hissab.io · its alternatives →
- 7FM
Free and Open Source software for managing math homework. Students digitally record step-by-step math work. Teachers simultaneously review all assignments with complete solutions grouped by similar final answer. Grade faster and more thoroughly every day!
2017 · freemathapp.org · its alternatives →
- 8CA
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 →
- 9
- 10AD
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 · its alternatives →
- 11
Advanced Mathematics Library for Node.js and JavaScript - numbers/numbers.js
2012 · github.com · its alternatives →
- 12
uCalc▲194Functional calcs and forms, no developers or coding required
2020 · ucalc.pro · its alternatives →
- 13
A free-form calculator for Chrome
2022 · chromewebstore.google.com · its alternatives →
- 14
Terminal based bit manipulator in ncurses. Contribute to mellowcandle/bitwise development by creating an account on GitHub.
2019 · github.com · its alternatives →
- 15
Portal for integrating and running third party web apps
2023 · totaljs.com · its alternatives →
- 16
An npm library package to calculate everything you want.
2022 · npmjs.com · its alternatives →
- 17
Calculate percentages in a neumophic and efficient interface
2021 · pourcentag.es · its alternatives →
- 18AB
2020 · saasformulas.com · its alternatives →
- 19IB
You know that old TI calculator you used in high school, then put in a box and forgot about? Have you ever wished you had an operating system for your calculator with preemptive multitasking, dynamic memory management, a tree filesystem conforming to the FHS, and all the comforts of Unix? Well, good news: that's totally a thing that exists. I've been working on my kernel for about three and a half years now and I'm looking for new contributors to help out. It's written entirely in z80 assembly, and it's both challenging and fun to work on. There's an IRC channel for contributors or people…
2014 · its alternatives →
- 20AO
2018 · medium.com · its alternatives →
- 21
Advanced calculator suite for desktop and mobile
Jun 2026 · nexus-calc-by-mh.lovable.app · its alternatives →
- 22
GitHub▲5Minimal calculator built with core web technologies
Jan 2026 · github.com · its alternatives →
- 23
Every Calculation Tool You'll Ever Need. Growing list of calculators, in a clean, simple design.
2025 · calculation-hub.com · its alternatives →
- 24
Crunch numbers using functional programming!
2025 · rohanphanse.github.io · its alternatives →
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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 →