Most online tools make you sign up before they do anything useful. I got tired of that, so I started building the opposite: small, free calculators and converters that open and just work — no account, no download, no email wall.
Toolsped now has 600+ of them: finance, mortgage, math, health, home and unit conversion tools, all running client-side in the browser. Your numbers never leave your device.
Two of the newest ones show the idea best:
- The ml to oz converter converts milliliters to US and UK fluid ounces both ways, with a printable kitchen chart and an embed option if you want the converter on your own page.
- The home mortgage calculator works out the monthly payment from home price, down payment, rate and term, then shows the full amortization schedule — principal, interest and balance year by year.
What I learned shipping these:
- Speed beats features. A tool that loads instantly gets used; a tool with a signup wall gets closed.
- One good page beats ten thin ones. Each tool answers one question completely — the working, the table, the worked example, the FAQs.
- Free forever is a feature. No paywall means people actually link to the tool, and those links are how a small site grows.
The whole library is at Toolsped — free, no sign-up. What tool should I build next?
