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Calculators for everyday math · Open source

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Watching this group for 24 days, checked once a day · how we check

Free Finance Tools

LiveWatched 9d

A free hub of 25+ e-commerce and freelance calculators (Etsy, Amazon FBA, Shopify, Stripe profit) with a built-in AI helper.

FreeOpen sourceNo ads
What to know▼
How it works
25+ calculators for calculating true profit on Etsy, Amazon FBA, Shopify and Stripe sales, with saved calculations and an open-source AI helper called Penny.
Pricing
Completely free, no ads or paywalls.
Best for
E-commerce sellers, freelancers and small businesses.
Details →

LineSolv

LiveWatched 21d

An open-source desktop calculator that parses phrases like '20% of 150' plus unit conversion and graphing, a general tool despite the developer-flavored tech stack.

Open source
What to know▼
How it works
A cross-platform desktop calculator that parses natural-language phrases like '20% of 150' or '5 kg in pounds', with unit conversion, function graphing and step-by-step evaluation.
What's different
Built with Go + Wails for a roughly 25 MB binary that starts instantly, versus heavier calculator apps.
Pricing
Free and open source, MIT licensed.
Details →

Falah.io — Open-Source Islamic Platform

LiveWatched 22d

A free, open-source, ad-free set of Islamic tools -- prayer times, Quran explorer, Zakat and inheritance calculators, Qibla finder -- a client-side app for personal religious use, not work software.

Open sourceNo ads
What to know▼
How it works
A client-side web app bundling Islamic tools: prayer times and Adhan, a Hijri calendar, Ramadan countdown, Qibla and mosque finder, a Quran and Tafseer explorer, and Zakat/inheritance calculators.
What's different
Open-source, ad-free, and runs client-side rather than sending data to a server.
Pricing
Free.
Best for
Individuals looking for a private, all-in-one set of Islamic religious and calendar tools.
Details →