Free Developer Tools

Fast, private tools built by engineers.

Developer utilities that run entirely in your browser — nothing uploaded, nothing stored. Free, instant, and made by the team you can hire to build the real thing.

Developer Toolkit

Developer tools

Free

API Client & REST Tester

Build and send HTTP requests and inspect responses — a Postman-style client in your browser.

Open

Free

Webhook Inspector

Get a URL, send any webhook to it, and watch requests arrive live.

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Free

Code Playground

Write HTML, CSS, and JS with a live sandboxed preview.

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Free

QR Code Generator

Turn any URL or text into a customizable QR code — PNG or SVG.

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Free

JSON to TypeScript

Generate typed TypeScript interfaces from any JSON — nested objects and arrays included.

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Free

JSON Formatter & Validator

Beautify, minify, and validate JSON with clear error messages.

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Free

Diff Checker

Compare two blocks of text or code with an LCS line diff.

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Free

Cron Expression Explainer

Explain a cron schedule in plain English and see the next 5 run times.

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Free

JSON ↔ CSV Converter

Convert JSON arrays to CSV and back, with correct quoting.

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Free

JWT Decoder

Decode a JWT's header, payload, claims, and expiry.

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Free

Regex Tester

Test regular expressions with live match highlighting.

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Free

Timestamp Converter

Convert Unix/epoch time to a date and back — seconds or ms.

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Free

Base64 Encoder / Decoder

Convert text to and from Base64 (UTF-8 and URL-safe).

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Free

Case Converter

camelCase, snake_case, kebab-case, slug, and more.

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Free

Hash Generator

SHA-1, SHA-256, SHA-384, and SHA-512 of any text.

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Free

Color & Gradient Picker

HEX / RGB / HSL conversion and a CSS gradient builder.

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For your business

AI & business tools

Free

AI Text Humanizer

Rewrite AI or stiff text to sound natural and human.

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Free

AI Summarizer

Summarize any article or document into key points.

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Free

AI Translator

Translate text into any language, naturally.

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Free

AI Code Explainer

Paste code and get a clear, plain-English explanation with bugs and fixes.

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Free

AI Regex Generator

Describe a pattern in plain English and get a working regex.

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Free

AI SQL Generator

Turn a plain-English request (and your schema) into a SQL query.

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Free

AI Unit Test Generator

Paste a function and get thorough unit tests in the right framework.

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Free

AI Error Explainer

Paste an error or stack trace and get the cause and a fix.

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Free

AI Commit Message

Paste a git diff and get a clean Conventional Commits message.

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Free

AI Mock Data Generator

Describe fields and get realistic sample JSON to test with.

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Free

AI Cron Generator

Describe a schedule in plain English and get the cron expression.

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Free

AI Prompt Improver

Turn a rough prompt into a clear, effective one.

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Free

LLM Token & Cost Calculator

Estimate tokens and compare API costs across Claude, GPT, and Gemini.

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Free

AI Content Detector

Estimate whether text is AI-written, with the writing signals behind it.

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Free

AI Opportunity Finder

Pick your industry and get a tailored list of high-impact AI opportunities.

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Free

Automation ROI Calculator

Estimate the hours and money automation could save your team.

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Free

AI Readiness Assessment

A quick score for how ready your business is to adopt AI.

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Free

Resume Scorer

ATS score and specific fixes against an optional job description.

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Want this built into your own software?

These free tools are a taste of what we do. Leave your details and our team will reach out — or build something like this into your systems.

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