Hum

Hum is an AI coding tool that runs entirely in your browser. No install, no account, no subscription. Open heyhum.net on your phone, tablet, or laptop and start building. Most AI coding tools hide what's happening. You send a prompt, get code back, and somewhere in between the model read files, burned tokens, and made decisions you never saw. Hum shows all of it. Every file the model touched. Every token spent. The full prompt that left your browser. The API call with status and timing. You see what happened before you commit anything. Hum is BYOK. Bring your own key from Anthropic, OpenRouter, or run local models through Ollama. Hum charges nothing on top. You pay your provider directly, only for what you actually use. Skip a week, pay nothing. Or use the free tier with 20 messages a day, no key needed, no card, no signup. Code changes arrive as real diffs inside Hum's built-in editor. Review line by line, accept or reject each hunk, spot-edit before applying, or open the full file and write the line yourself. Nothing overwrites your code without your hand on it. Your workspace is the same across devices. Start on your laptop, pick it up on your phone, push a fix from the couch. Same files, same diffs, no install on either. What makes Hum different from every other tool in this space is Walkthrough. Select any block of code and Hum opens a side panel that walks you through what it does, line by line, in plain language. Pick a difficulty level: Beginner spells things out as if you're new to the codebase, Normal gives a mid-level read, Expert skips the basics and focuses on edge cases, performance, and gotchas. There's a "Watch Out" callout when something deserves a closer look, and you can save any walkthrough to your notes for later. Walkthrough also works on whole files. Open it from the file menu and Hum breaks the file into 4 to 8 beats organized by responsibility. It reads your pinned project files for context, so it can tell you "this hook is the one Settings.tsx imports" instead of guessing. No other coding tool does this. Every competitor buries explanation inside a chat window where it scrolls away. Hum makes understanding your code a first-class feature, not an afterthought. Compare Mode lets you ask two models the same question side by side and pick the winner. Great for stubborn bugs where one model is confidently wrong, or for testing whether your prompt works across providers before you commit your workflow to one. Pipelines let you chain tasks together with control flow. Set a task to auto-run or require manual review. Define what happens on pass or fail: move to the next step, stop, retry, or jump. Attach files, notes, and presets to each task. It's automation with guardrails. Hum has a community prompt library where users share and fork system prompts, and a profiles system for swapping between custom configurations. Drop a file into a fresh workspace and Hum parses it instantly on your machine: lines, functions, exports, TODOs, imports, size. No model call, no key needed. The chat input pre-fills a starter question based on the file type. Drop a diff and it asks what changed. Drop a test file and it asks how the tests are organized. Security is the architecture, not a feature. API keys live in your browser and are never stored on Hum's servers. Requests pass through as a stateless proxy. Your key is attached in flight, forwarded to your provider, and dropped. There is no user database to breach because there are no user accounts. Enable Transparency Mode to audit every request before it leaves your browser. Enable Safe Mode to require approval before any file write or shell command. Encrypted exports wrap your workspace backup in AES-GCM with a passphrase only you know. Hum was not built to compete with Cursor or Copilot. It was built for the people those tools were never designed for. The developer who wants to ship from a phone at midnight. The learner who wants to understand the code, not just receive it. The engineer who cares where their data goes. The solo founder who can't justify $20 a month to test an idea. Free tier, no signup, runs in your browser. BYOK when you're ready. Hum Pro lifts the limits with Walkthrough, encrypted exports, and more. Built by one person on a phone. No VC, no team, no runway. Just a small bird and a stubbornness problem.