Free developer tools
Small, fast, browser-only utilities. No account, no ads, no email gate, and no request carrying your data to a server — every one of these runs entirely in your own tab.
CTC to monthly take-home, with the new and old tax regimes side by side. EPF, gratuity, professional tax, surcharge and cess included.
Work backwards from the take-home you want to the hourly rate, day rate and retainer you should be charging. Handles 44ADA and the GST threshold.
Paste a cron expression, read it in English, and see the next ten fire times in your timezone or UTC. Explains the day-of-month/day-of-week rule that catches everyone.
Decode header, payload, claims and expiry. The token never leaves the tab — which is the entire point — and there is deliberately no box for your signing secret.
Paste a Meta webhook body and get a readable breakdown of messages, delivery statuses, conversation billing category, and what each error code actually means.
Why these exist
Every one of these started as something I needed and could not find a clean version of. Salary calculators want your phone number. Freelance rate calculators assume you are American. Cron explainers are wrapped in three layers of ad.
So these are deliberately boring: a single page, no tracking on the numbers you type, and the calculation logic sitting in plain TypeScript that runs on your machine. If one of them is wrong or missing a case, tell me and I will fix it.
What is coming
If there is something you keep googling and never find a decent version of, that is genuinely useful input — send it over and it may well end up here.
Built and maintained by Himanshu Srivastava, a backend systems engineer in Bengaluru, India.