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Essential developer utilities: JSON formatter, regex playground, SQL formatter, JWT decoder, Base64 encoder, UUID generator, diff checker, and more.
Your AI API bill on the day each price change lands, and the cheapest switch
Open →DeveloperFind what breaks when Chrome 158 turns XSLT off on 17 Nov 2026
Open →DeveloperHow many days your $100, $200 or $500 API credit lasts
Open →DeveloperPrice an agent fleet per run, day and month on every major model at once
Open →DeveloperBuilder/critic agent prompts with brakes built in
Open →DeveloperFormat, validate & diff JSON — runs entirely in browser
Open →DeveloperTest regex live — railroad diagrams + plain English explained
Open →DeveloperBeautify and format SQL queries instantly
Open →DeveloperDecode JWT header, payload & expiry — tokens stay private
Open →UtilitiesEncode and decode Base64 instantly
Open →UtilitiesGenerate unique IDs with one click
Open →DeveloperMD5, SHA-1, SHA-256, SHA-512 hashes in your browser
Open →DeveloperCompare two texts and spot every difference instantly
Open →DeveloperConvert cURL commands to Python, JavaScript, Go, and PHP
Open →DeveloperValidate, compare, and convert .env files
Open →DeveloperFormat, validate and minify XML with syntax highlighting
Open →UtilitiesConvert timestamps to human dates and back
Open →DeveloperBuild cron jobs visually — no syntax to memorize
Open →DeveloperWrite Markdown with instant live preview and HTML export
Open →DeveloperCompare AI API costs across every major LLM
Open →DeveloperCount tokens & estimate costs for GPT-5.4, Claude 4.6 & Gemini 3.1 Pro
Open →DeveloperVisualize project dependencies as an interactive graph
Open →Every developer needs a reliable set of online utilities. Our developer tools handle the everyday tasks — formatting JSON, testing regex patterns, decoding JWTs, converting cURL commands to code, and more.
All tools run entirely in your browser with zero server communication. Your code, API keys, and data never leave your device. No accounts, no tracking, no limits.