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Free tools for developers and designers
Compare cloud costs, format JSON, test regex, build cron schedules and pick colors — instantly, in your browser. Nothing you paste ever leaves your device.
45 tools in 9 categories
Cloud cost calculators
Compare AWS, Google Cloud, Azure and Cloudflare prices for the same workload.
Cloud Cost Calculator
NewCompare monthly costs on AWS, Google Cloud, Azure and Cloudflare for the same workload.
Open toolAWS Cost Calculator
NewEstimate EC2, Lambda, S3, RDS and data transfer costs in seconds, next to other clouds.
Open toolGoogle Cloud Cost Calculator
NewEstimate Compute Engine, Cloud Run, Cloud Storage and Cloud SQL costs, next to other clouds.
Open toolAzure Cost Calculator
NewEstimate Azure VMs, Functions, Blob Storage and PostgreSQL costs, next to other clouds.
Open toolCloudflare Cost Calculator
NewEstimate Cloudflare Workers, R2, D1, KV and CDN costs, next to AWS, Google Cloud and Azure.
Open tool- Compare
Cloud Pricing Comparison
NewPut any two clouds head to head on the same workload: AWS, Google Cloud, Azure, Cloudflare.
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JSON tools
Format, validate, diff and turn JSON into typed code.
JSON Formatter
Pretty-print, minify, sort and repair JSON, with the exact line and column of every error.
Open toolJSON Validator
Find every JSON syntax error, duplicate key and unsafe number, each with a plain-English fix.
Open toolJSON to TypeScript
Generate TypeScript interfaces from JSON, with optional and nullable fields detected.
Open toolJSON Diff
Compare two JSON documents by value and see every added, removed and changed path.
Open toolJSON to Zod
Turn a JSON sample into Zod schemas and inferred TypeScript types for runtime validation.
Open toolJSON to Go
Generate gofmt-ready Go structs with json tags, omitempty and pointers for optional fields.
Open toolJSON to C#
Generate C# records or classes with JSON attributes and nullable reference types.
Open toolJSON to Dart
Generate null-safe Dart models with fromJson, toJson and copyWith for Flutter apps.
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Code converters
Turn cURL, SQL and SVG into production-ready code.
SQL Formatter
Beautify or minify SQL in 12 dialects, with keyword case, indent and line:column errors.
Open toolcURL to Python Converter
NewConvert cURL commands into Python requests or httpx code with params, json, files and auth.
Open toolcURL to Fetch Converter
NewTurn any cURL command into JavaScript fetch() code with headers, JSON, forms and auth.
Open toolcURL to Axios Converter
NewConvert cURL commands into an Axios request config with params, data, auth and timeouts.
Open toolSQL to Prisma Converter
Turn SQL DDL into a schema.prisma with native types, relations and enums.
Open toolSQL to Drizzle Converter
Turn SQL DDL into a typed Drizzle schema.ts with indexes, enums and relations().
Open toolSVG to JSX Converter
Turn SVG markup or files into clean React and React Native components.
Open toolcURL to Dart Converter
NewConvert cURL commands into Dart http or Dio code for Flutter apps and dart run scripts.
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Regex and cron
Test regular expressions and build cron schedules.
Encoding and security
Decode JWTs, encode Base64 and URLs, generate hashes.
JWT Decoder
Decode JWTs, explain every claim and expiry, verify signatures and sign new tokens.
Open toolBase64 Encoder and Decoder
Encode text or files to Base64 and back, with Base64url, data URIs and type-detected downloads.
Open toolURL Encoder and Decoder
Percent-encode or decode URLs and query values, and inspect every parameter.
Open toolHash Generator
MD5, SHA-1, SHA-256, SHA-384 and SHA-512 for text or files, with HMAC and checksum verify.
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ID generators
UUID, ULID and nanoid generators with bulk export.
UUID Generator
Generate v4 and v7 UUIDs in bulk, and decode any UUID's version and timestamp.
Open toolNanoid Generator
Generate nanoid IDs with any alphabet and length, and check how long until a collision.
Open toolULID Generator
Generate sortable ULIDs in bulk, decode their timestamps and convert them to UUIDs.
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CSS generators
Gradients, shadows, glassmorphism and clip-paths with live preview.
CSS Gradient Generator
Linear, radial and conic gradients with draggable stops, OKLCH blending and layers.
Open toolBox Shadow Generator
Layered, smooth and Material shadows for box-shadow, drop-shadow and text-shadow.
Open toolGlassmorphism Generator
Frosted glass panels with live preview, contrast checks and backdrop-filter CSS with fallbacks.
Open toolClip-Path Generator
Drag points to build polygon, circle, ellipse and inset clip-paths, then copy CSS or SVG.
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Color tools
Color wheel, color theory, palettes, contrast and conversions.
Color Contrast Checker
NewCheck WCAG 2.2 contrast for text and UI, and fix failures with the nearest passing color.
Open toolColor Wheel
RYB, RGB, CMY and OKLCH wheels with 13 color harmonies.
Open toolColor Converter
NewConvert any color between HEX, RGB, HSL, OKLCH, LAB and CMYK, with code for every platform.
Open toolTailwind Color Generator
NewTurn one brand color into a Tailwind 50–950 scale on v4's OKLCH curve, with v4 and v3 exports.
Open toolColor Theory Guide
An interactive guide to hue, harmony, temperature, contrast and color in UI design.
Open toolColor Blindness Simulator
NewSee palettes and images through 7 types of color blindness and catch hard-to-tell-apart pairs.
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Timers
Countdown timer, stopwatch, interval and Pomodoro timers.
Online Timer
Countdown timer with several named timers, six alarm sounds and a fullscreen focus mode.
Open toolPomodoro Timer
25/5 focus timer with long breaks, auto-start, focus sounds and today's session stats.
Open toolStopwatch
Precise stopwatch with lap and split times, fastest and slowest laps, and CSV export.
Open toolInterval Timer
HIIT, Tabata and boxing round timer with sets, countdown beeps, voice cues and phase colors.
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Why developers use these tools
Private by design
Everything runs on your device. Paste API responses, tokens or SQL without wondering where they go.
Fast on any device
No heavy editors, no ads, no pop-ups. Pages load quickly on phones and work on every screen size.
Built by working engineers
Every tool explains the why, not just the how — with examples you can copy straight into your code.
Frequently asked questions
Missing a tool you need? Tell us
From the engineers who built this tool
Building something bigger than a quick fix?
Auth, payments, dashboards and security are where web apps get hard. We have shipped them many times. Share your idea and we will map out a realistic plan and estimate, free and with no obligation.