# justbuildthings > A collection of 500+ free online tools for AI, design, development, music, finance, utilities, and games. No signup required. All tools run in browser. justbuildthings provides instant access to productivity tools without accounts, subscriptions, or ads. Tools are organized into categories and work directly in the browser. ## AI Tools - [AI Chat](https://justbuildthings.com/ai-chat): Chat with 100+ AI characters including philosophers, historical figures, and custom personalities - [AI Text Generator](https://justbuildthings.com/ai-writer): Generate marketing copy, business names, social media posts, creative writing, and 100+ content types - [AI Image Generator](https://justbuildthings.com/ai-image-generator): Create AI images with 118+ style presets including portraits, landscapes, anime, fantasy, and artistic styles - [AI Video Generator](https://justbuildthings.com/ai-video-generator): Generate AI videos with cinematic, nature, abstract, and themed styles - [AI Image Analysis](https://justbuildthings.com/ai-image-analysis): Analyze images with 121+ tools for accessibility, style, content, prompts, and technical details - [AI Text Analysis](https://justbuildthings.com/ai-text-analysis): Analyze text for readability, sentiment, keywords, tone, grammar, and 40+ metrics - [AI PDF Analysis](https://justbuildthings.com/ai-pdf-analysis): Summarize, extract data, and analyze PDFs with 29+ specialized tools - [AI Audio Analysis](https://justbuildthings.com/ai-audio-analysis): Analyze audio for emotions, speech patterns, music genres, and 42+ audio properties - [AI Music Generator](https://justbuildthings.com/ai-music-generator): Create original music compositions and melodies - [Speech to Text](https://justbuildthings.com/speech-to-text): Convert audio recordings to text instantly - [Text to Speech](https://justbuildthings.com/text-to-speech): Convert text to natural speech with multiple voices - [Vibe Coder](https://justbuildthings.com/vibe-coder): AI code generator that creates complete web apps, games, and interactive experiences - [AI Flashcard Generator](https://justbuildthings.com/ai-flashcard-generator): Create educational flashcards from any topic - [AI Quiz Generator](https://justbuildthings.com/ai-quiz-generator): Create quizzes from any topic or text - [Online Tests & Quizzes](https://justbuildthings.com/online-tests): 50+ personality assessments including MBTI, Big Five, Enneagram, Love Language, and more ## Design Tools - [Logo Generator](https://justbuildthings.com/logo-generator): Create professional logos with AI assistance - [Color Palette Generator](https://justbuildthings.com/color-palette-generator): Generate harmonious color schemes for designs - [Font Pairing Generator](https://justbuildthings.com/font-pairing-generator): Find perfect font combinations - [Golden Ratio Calculator](https://justbuildthings.com/golden-ratio-calculator): Calculate golden ratio proportions - [RGB to HEX Converter](https://justbuildthings.com/rgb-to-hex-converter): Convert between RGB and HEX color formats - [Pixel Art Creator](https://justbuildthings.com/pixel-art-creator): Create retro pixel art and 8-bit graphics - [Color Contrast Checker](https://justbuildthings.com/color-contrast-checker): Check WCAG accessibility compliance - [Image to GIF](https://justbuildthings.com/image-to-gif): Convert images to animated GIFs - [Image Compressor](https://justbuildthings.com/image-compressor): Compress images while maintaining quality - [Image Resizer](https://justbuildthings.com/image-resizer): Resize images with aspect ratio control - [Convert to JPG](https://justbuildthings.com/convert-to-jpg): Convert images to JPG format - [Image Rotator](https://justbuildthings.com/image-rotator): Rotate images by any angle ## Development Tools - [SEO Checker](https://justbuildthings.com/seo-checker): Analyze websites for technical SEO issues - [JSON Formatter](https://justbuildthings.com/json-formatter-validator): Format, validate, and beautify JSON - [Code Beautifier](https://justbuildthings.com/code-beautifier): Format and beautify code - [Code Minifier](https://justbuildthings.com/code-minifier): Minify CSS, JavaScript, and HTML - [Markdown Editor](https://justbuildthings.com/markdown-editor-preview): Write and preview Markdown live - [UUID Generator](https://justbuildthings.com/uuid-generator): Generate unique identifiers - [Epoch Timestamp](https://justbuildthings.com/epoch-timestamp): Convert Unix timestamps - [Base64 Encoder/Decoder](https://justbuildthings.com/base64-encoder-decoder): Encode and decode Base64 - [URL Encoder/Decoder](https://justbuildthings.com/url-encoder-decoder): Encode and decode URLs - [SVG Converter](https://justbuildthings.com/svg-converter): Convert and optimize SVG files - [Lorem Ipsum Generator](https://justbuildthings.com/lorem-ipsum-generator): Generate placeholder text - [Responsive Testing Tool](https://justbuildthings.com/responsive-testing-tool): Test website responsiveness ## Music Tools - [Guitar Tuner](https://justbuildthings.com/guitar-tuner): Tune guitar using microphone - [Metronome](https://justbuildthings.com/metronome): Digital metronome with adjustable BPM - [Chord Progression Generator](https://justbuildthings.com/chord-progression-generator): Generate chord progressions - [Music Scale Practice Tool](https://justbuildthings.com/music-scale-practice-tool): Practice scales interactively - [Perfect Pitch Trainer](https://justbuildthings.com/perfect-pitch-trainer): Develop perfect pitch - [Interval Trainer](https://justbuildthings.com/interval-trainer): Learn musical intervals by ear - [Drum Machine](https://justbuildthings.com/drum-machine): Create beats and drum patterns - [Radio](https://justbuildthings.com/radio): Listen to radio stations worldwide ## Finance Tools - [Compound Interest Calculator](https://justbuildthings.com/compound-interest-calculator): Calculate investment growth - [Savings Goal Calculator](https://justbuildthings.com/savings-goal-calculator): Plan savings goals - [Bill Splitter](https://justbuildthings.com/bill-splitter): Split expenses among friends - [Tip Calculator](https://justbuildthings.com/tip-calculator): Calculate tips and split bills - [Invoice Generator](https://justbuildthings.com/invoice-generator): Create professional invoices ## Utilities - [Pomodoro Timer](https://justbuildthings.com/pomodoro-timer): Boost productivity with focused sessions - [Countdown Timer](https://justbuildthings.com/countdown-timer): Set custom countdown timers - [Unit Converter](https://justbuildthings.com/unit-converter): Convert between measurement units - [Password Generator](https://justbuildthings.com/password-generator): Generate secure passwords - [QR Code Generator](https://justbuildthings.com/qr-code-generator): Create QR codes - [Text Case Converter](https://justbuildthings.com/text-case-converter): Convert text cases - [Word Count Tool](https://justbuildthings.com/word-count-tool): Analyze text with word/character counts - [Cryptography Tool](https://justbuildthings.com/cryptography-tool): Encrypt and decrypt text - [PDF Merger](https://justbuildthings.com/pdf-merger): Merge multiple PDFs - [PDF Splitter](https://justbuildthings.com/pdf-splitter): Split PDFs by page ranges - [Fourier Transform Visualizer](https://justbuildthings.com/fourier-transform-visualizer): Visualize wave analysis ## Games - [Snake Game](https://justbuildthings.com/snake-game): Classic Snake arcade game - [Tetris](https://justbuildthings.com/tetris): Classic falling block puzzle game - [Pong](https://justbuildthings.com/pong): Classic paddle game, 1P or 2P mode - [Tic Tac Toe](https://justbuildthings.com/tic-tac-toe): Classic Tic Tac Toe - [Rock Paper Scissors](https://justbuildthings.com/rock-paper-scissors): Play against the computer - [Game of Life](https://justbuildthings.com/game-of-life-simulator): Conway's cellular automaton - [Dice Roller](https://justbuildthings.com/dice-roller): Roll virtual dice - [Coin Flip](https://justbuildthings.com/coin-flip-simulator): Flip virtual coins - [Magic 8 Ball](https://justbuildthings.com/magic-8-ball): Get mystical answers ## Optional - [Blog](https://justbuildthings.com/blog): Articles about web development, design, and productivity - [All Design Tools](https://justbuildthings.com/design-tools): Browse all design tools - [All Development Tools](https://justbuildthings.com/development-tools): Browse all dev tools - [All Music Tools](https://justbuildthings.com/music-tools): Browse all music tools - [All Finance Tools](https://justbuildthings.com/finance-tools): Browse all finance tools - [All Utilities](https://justbuildthings.com/utilities): Browse all utility tools - [All Games](https://justbuildthings.com/games): Browse all games