Launching RapidCalc: 300+ Zero-Backend Utilities & Converters

Hey everyone!

We're thrilled to officially launch RapidCalc on Product Hunt.

We built RapidCalc because we got tired of utility sites that gatekeep features behind sign-ups, slap on aggressive paywalls, or quietly upload sensitive data to remote backend servers just to format JSON, calculate a loan, or convert an image.

RapidCalc runs entirely client-side using pure Vanilla JavaScript, HTML5, and CSS3. Your data never leaves your browser sandbox, meaning zero data logging, zero latency, and instant execution across 9 dedicated hubs (Finance, Dev, Math, Converters, and more).

We’d love your feedback, feature requests, and thoughts on the zero-backend architecture!