Calculators & Developer Tools.
Fast, accurate, embeddable.
From compound interest to SHA1 hashing — instant results, clean design, and one-line embeds for your own site.
Everything you need, nothing you don't
A growing library of well-documented calculators, each ready to embed and optimized for the web.
Instant Results
Every calculation runs client-side for zero-latency answers as you type.
One-Line Embeds
Drop any calculator into your site with a single script tag or web component.
Finance Tools
Mortgage, loan, compound interest and more — accurate to the cent.
Developer Utilities
Hashing, encoding, and conversion tools built for engineers.
100% Private
No accounts, no tracking of your inputs. Everything stays on your device.
Mobile First
Responsive, touch-friendly interfaces that work on any screen size.
Start with a favorite
Hand-picked calculators our visitors use most.
Compound Interest Calculator
Calculate compound interest on your investments with our free online calculator
Mortgage Calculator
Calculate monthly mortgage payments, amortization, and total interest with our free calculator
SHA1 Hash Generator
Generate SHA1 hashes from text input with our free online tool
Build your embed package
Configure options step by step and watch your estimate update in real time.
Choose the package that fits your needs.
Pick the level of help you want after launch.
One-time, billed on approval
- Single Calculator Embed
- Community (free)