Documentation

Sixteen developer verifiers that run entirely in your browser. Nothing you paste is uploaded, and every verdict is reproducible — the same input gives the same answer, in the page, in the CLI and over MCP.

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Getting Started

DevTools by Hakeemify is a suite of professional developer utilities — free to use, no account required. Every tool works instantly in your browser with no installation, no signup, and no loading delays.

⚡LIVE

RegexLab

Visual regex builder & tester

⏱LIVE

CronBuilder

Cron expression generator

{}LIVE

JSONCraft

JSON formatter & transformer

🔐LIVE

HashLab

Hash, encode, decode & generate

🔗LIVE

URLInspector

Parse, inspect & build URLs

📝LIVE

DiffViewer

Side-by-side text diff viewer

🎨LIVE

ColorSystemPro

Design system from one brand color

🧾LIVE

InvoiceZen

Professional invoices in 60 seconds

📊LIVE

CSVStudio

Preview, filter & convert CSV files

🧪LIVE

APITester

Lightweight HTTP request builder

🔑LIVE

JWT Decoder

Decode, inspect & verify JWTs

🕐LIVE

Timestamp Converter

Unix time, humanized

📄LIVE

YAML ⇄ JSON

Convert between YAML and JSON

🔒LIVE

Password Generator

Strong passwords & passphrases

🗄LIVE

SQL Formatter

Beautify and minify SQL

🔧LIVE

.env Comparer

Diff two environment files

How it works

Open any tool

Navigate to a tool directly. No account required — everything works instantly. Try RegexLab or CronBuilder.

Build your pattern or expression

Type directly into the main input. Results appear live as you type — no submit button, no waiting.

Share or export

Every tool encodes its full state in the URL. Copy the URL from your browser and share it — your recipient sees exactly what you built. Use Export Code to get production-ready snippets in JS, Python, PHP, or Go.

Install it (optional)

DevTools is installable as an app on desktop and mobile — look for an install prompt, or install manually from your browser's menu. Once installed, tools you've visited keep working even offline.

Everything else

The verification workflowWhat a verdict means, what PASS does not promise, how HEURISTIC findings differ from proven ones, and how to hand findings back to an assistant.Verdicts and findings · Verify Anything · Copy Findings for agents · Workbench and history Privacy, local processing and sharingEverything runs in your browser. What is never put in a share link, how fields are classified, and what an export contains.Local processing · Sharing safely · Share and export CLI and MCP serverRun the same verifiers from the command line or expose them to an assistant over MCP. One implementation, asserted by the test suite.Tool referenceWhat each of the 16 tools checks, what it proves, and what it deliberately does not claim.CronBuilder · RegexLab · JSONCraft · APITester · DiffViewer · URLInspector · JWT Decoder · HashLab · CSVStudio · YAML ⇄ JSON · SQL Formatter · .env Comparer · Timestamp Converter · ColorPro · Password Generator · InvoiceZen · Coming soon Pro and LifetimeSaving named patterns, expressions and snippets to an account is the only thing a paid plan unlocks. Every verifier, every export and every share link stays free.Frequently asked questionsDo you need an account, does anything get uploaded, does it work offline, and what happens to a share link — answered.ChangelogEvery release of DevTools by Hakeemify, newest first: new verifiers, changes to what a verdict means, and fixes worth knowing about.

DevTools by Hakeemify — 16 tools live

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