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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.
83 tools in 13 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.
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Cloud Pricing Comparison
NewPut any two clouds head to head on the same workload: AWS, Google Cloud, Azure, Cloudflare.
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Legal generators
Privacy policies, terms and EULAs for apps, extensions, games and websites.
Privacy Policy Generator
NewDraft a privacy policy for your app, website, extension or game, with GDPR and SDK clauses.
Open toolPrivacy Policy Generator for Apps
NewWrite the privacy policy the App Store and Google Play require, with your SDKs disclosed.
Open toolPrivacy Policy Generator for Websites
NewCreate a website privacy policy covering forms, cookies, analytics, ads and embedded content.
Open toolTerms and Conditions Generator
NewDraft terms and conditions for your website, app or SaaS: accounts, payments, content and liability.
Open toolPrivacy Policy Generator for Chrome Extensions
NewWrite a Chrome extension privacy policy with the Limited Use statement the Web Store expects.
Open toolPrivacy Policy Generator for Games
NewDraft a game privacy policy covering player accounts, chat, ads, analytics and young players.
Open toolEULA Generator
NewCreate an end user license agreement for your app, desktop software or game.
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SEO and marketing tools
Meta tags, Open Graph previews, robots.txt, sitemaps, UTM links and QR codes.
Meta Tag Generator
NewWrite title, description, Open Graph and X tags with live Google and share previews.
Open toolOpen Graph Preview
NewSee how a link looks on Facebook, X, LinkedIn, Slack, Discord, WhatsApp and iMessage.
Open toolQR Code Generator
Make QR codes for links, text, email, calls and texts, with a logo, colors, PNG and SVG.
Open toolRobots.txt Generator
NewBuild a valid robots.txt with presets, AI crawler opt-outs and live RFC 9309 checks.
Open toolXML Sitemap Generator
NewTurn URL lists or CSV into sitemap.xml with lastmod and hreflang, or validate a sitemap.
Open toolUTM Builder
Build campaign URLs with UTM tags, see the GA4 channel they land in, and tag links in bulk.
Open toolRobots.txt Tester
NewCheck which URLs a crawler may fetch, with the exact rule that decides each one.
Open toolllms.txt Generator
NewBuild a valid llms.txt from a form, a URL list or a sitemap, and validate existing files.
Open toolWiFi QR Code Generator
Let guests join your Wi-Fi with one scan, and print a ready-made Scan to join card.
Open toolvCard QR Code Generator
Put your contact details in a QR code that saves straight to any phone's address book.
Open toolWhatsApp QR Code Generator
A QR code and wa.me link that open a WhatsApp chat with your number and a ready message.
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Notion widgets
Free, good-looking widgets for Notion: clocks, countdowns, calendars, quotes and trackers.
Free Notion Widgets
NewClocks, countdowns, Pomodoro timers, calendars and more for Notion, in five styles. Free.
Open toolNotion Clock Widget
NewDigital, analog, flip or word clock for Notion in any time zone, in five styles.
Open toolNotion Countdown Widget
NewCount down to any date and time in Notion, then show a message or keep counting up.
Open toolNotion Progress Bar Widget
NewHow much of the year, month, week, day or your own date range has passed, live in Notion.
Open toolNotion Calendar Widget
NewA mini month calendar for Notion with today marked, week numbers and month buttons.
Open toolNotion Pomodoro Timer Widget
NewA Pomodoro focus timer for Notion with breaks, session dots and a soft chime.
Open toolNotion Quote Widget
NewA quote of the day for Notion, from a collection with checked sources or your own list.
Open toolNotion World Clock Widget
NewUp to eight cities' times side by side in Notion, with day and night and time differences.
Open toolNotion Life Calendar Widget
NewYour life in weeks for Notion: a box for every week, filled up to today.
Open toolNotion Habit Tracker Widget
NewA habit tracker for Notion: tick off daily habits for the week or month and keep streaks.
Open toolNotion Moon Phase Widget
NewToday's moon phase for Notion, drawn to scale, with the next full and new moon.
Open toolNotion Counter Widget
NewA tap counter for Notion with plus and minus buttons, a goal and an optional daily reset.
Open toolNotion Water Tracker Widget
NewA water tracker for Notion: tap a glass each time you drink, toward a daily goal.
Open toolNotion Reading Tracker Widget
NewA reading tracker for Notion: a yearly book goal with your pace, or your page in a book.
Open toolNotion Greeting Widget
NewA greeting for your Notion dashboard: good morning, afternoon or evening, with your name.
Open toolNotion Affirmation Widget
NewA daily affirmation for Notion from our own collection of 60, or from your own list.
Open toolNotion Button Widget
NewA styled link button for Notion that opens any web page or email address in a new tab.
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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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Chrome extension tools
Build, validate and migrate Manifest V3 Chrome extension manifests.
Chrome Extension Manifest Generator
NewBuild a Manifest V3 manifest.json, preview install warnings and download a starter project.
Open toolManifest V3 Validator
NewCheck a Chrome extension manifest.json: errors by line, MV3 rules, install warnings, review risk.
Open toolMV2 to MV3 Converter
NewConvert a Manifest V2 manifest.json to Manifest V3, with a diff and a code checklist.
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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.