20+ instant-use tools across five categories. Everything runs directly in your browser — no signup, no account, no data sent anywhere.
Ten tools built for developers who open a new browser tab a dozen times a day. Format and validate JSON, decode JWTs and Base64, generate UUIDs and passwords, test regex patterns, convert colours, preview Markdown, and convert Unix timestamps — all in your browser, nothing sent anywhere.
Explore 10 tools →Five everyday calculators for the arithmetic nobody wants to do manually. Count words and characters, calculate exact ages and date differences, convert between metric and imperial units, and estimate how long any piece of content takes to read.
Explore 5 tools →Two straightforward health calculators with no jargon. Check your Body Mass Index against WHO categories in seconds, or calculate your Basal Metabolic Rate to set a realistic daily calorie target — whether you want to lose, maintain, or gain.
Explore 2 tools →Two calculators for the questions that matter most. See exactly how compound interest grows an investment over time — and why starting earlier beats investing more. Or calculate the true monthly payment and total cost of a mortgage before you sign anything.
Explore 2 tools →Solve any percentage problem in three seconds. What is 15% of $85? Is 47 out of 60 a pass? How much did revenue grow this quarter? Three types of percentage calculations in one tool — no formula, no spreadsheet, no mental gymnastics.
Explore 1 tool →