Launching today
CalcSpin
Free calculators and decision tools, no sign-up needed
1 follower
Free calculators and decision tools, no sign-up needed
1 follower
Small, fast browser tools: US state paycheck calculators, an EU261/UK261 flight delay compensation calculator, tip calculator, spin the wheel, random picker and QR codes. No sign-up, mobile friendly, and the math shows its sources.
Free
Launch Team
Render Sandboxes: a computer for every agentRun untrusted code safely. Idle sandboxes cost nothing
Promoted
Hi Product Hunt! I'm Justin, a solo maker. I started CalcSpin because most calculator sites I landed on from search were full of pop-ups, or gave a number without saying where it came from. So every calculator here shows the rules and sources it uses, and the date they were last checked. You can share a result as a link that reopens with the same inputs, or print it. Nothing you type is sent to a server. It started in Korean and is growing in English and German. Feedback I'd love: a number that looks wrong, wording that confuses you, or the next tool you'd want.