Developer tools

Free tools for engineers and job seekers.

Small, sharp utilities we needed ourselves. No sign-up, no upsell, and nothing you paste or upload is stored.

Free, instant, and no account required
Processed in your browser or in memory — never stored
Built by working engineers, for working engineers

ATS Resume Checker

Score your résumé against applicant tracking systems in seconds. Five weighted checks, specific fixes, and your file is never stored.

Open tool

JSON Formatter & Validator

Soon

Format, validate and minify JSON in the browser. Nothing leaves your machine.

Regex Tester

Soon

Build and test regular expressions against sample text with live match highlighting and an explanation of each token.

Diff Checker

Soon

Compare two blocks of text or code side by side with word-level highlighting.

JWT Decoder

Soon

Decode and inspect a JSON Web Token's header, payload and expiry — decoded locally, never sent anywhere.

Cron Expression Builder

Soon

Write a cron expression and read back the next ten run times in plain English.

Resume Keyword Matcher

Soon

Paste a job description and your résumé to see exactly which required keywords you're missing.

A better résumé still isn’t proof.

SUNCHAL verifies what you can actually build — a live evaluation with a senior engineer, free for candidates. Pass, and companies see the proof instead of the keywords.

Get verified — free