devwithcoffee

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.

Killed by MeGitHub · For fun

Type a GitHub username and see every project they abandoned, laid out as a graveyard — kill count, median lifespan, and an epitaph for each repo.

Image to ASCII ArtImage · Live camera

Turn a photo or your live camera into text art. Choose the characters, add colour, or paint it with your own word. Copy it, or save a PNG, video or GIF. Nothing is uploaded.

Claude Code Email Leak CheckerPrivacy · Offline

Drop in your Claude Code transcripts and see every web request that carried your email in its User-Agent, with the site and date. Nothing is uploaded.

Claude Code Settings Secret ScannerSecurity · Offline

Paste .claude/settings.local.json and see every API key, token or password that "Don't ask again" saved in your allow rules. Copy a cleaned file. Nothing is uploaded.

Claude Code Usage Cost CalculatorClaude Code · Offline

Drop your .claude/projects folder and see your tokens and what they would cost at API prices, by day, model and project. Each reply counted once. Nothing is uploaded.

In-Hand Salary CalculatorIndia · FY 2026-27

CTC to monthly take-home, with the new and old tax regimes side by side. EPF, gratuity, professional tax, surcharge and cess included.

Freelance Rate CalculatorIndia · Freelance

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.

Cron Expression ExplainerScheduling

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.

JWT DecoderAuth · Offline

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.

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.