The AI tool landscape is noisy. Every week there is a new "game-changing" tool that costs $20/month and requires three API keys to set up.
These 7 are different. They are free, they work right now, and they solve real problems I hit every day as a developer. No waitlists. No credit card required. Just tools that save time.
1. mcp-openapi -- Connect Claude to Any REST API in One Command
If you work with APIs (and you do), this is the one tool that changed my workflow the most. Point mcp-openapi at any OpenAPI or Swagger spec URL, and it auto-generates MCP tools for every endpoint. Claude can then explore and call the API directly from your terminal.
No code. No config files. No manual mapping.
Install:
npx -y mcp-openapi
Example -- connect Claude to the Petstore API:
{
"mcpServers": {
"petstore": {
"command": "npx",
"args": ["-y", "mcp-openapi"],
"env": {
"API_BASE_URL": "https://petstore3.swagger.io",
"OPENAPI_SPEC_URL": "https://petstore3.swagger.io/api/v3/openapi.json"
}
}
}
}
Swap the URLs for any API that publishes a spec -- Stripe, GitHub, CoinGecko, Twilio, you name it. It handles OpenAPI 3.x, Swagger 2.0, Bearer tokens, API keys, and OAuth2.
Why it is free: Open source, MIT licensed. GitHub repo
2. Cursor -- AI Code Editor with a Generous Free Tier
Cursor is a VS Code fork with AI built into every interaction -- Tab completions, inline edits, and a chat sidebar that understands your entire codebase. The free Hobby plan gives you 2,000 code completions and 50 premium requests per month, which is enough to seriously evaluate it.
Install: Download from cursor.com. Your VS Code extensions and settings import automatically.
What you get for free:
- 2,000 inline code completions/month
- 50 premium chat requests (Claude Sonnet, GPT-4.1)
- Full editor features with no lockouts
Why it matters: The AI completions are context-aware -- they read your open files, imports, and project structure. It is noticeably better than vanilla VS Code with a generic Copilot extension for multi-file edits.
3. FreeTools -- 22 Browser Tools, No Sign-Up Required
I built this because I was tired of signing up for yet another SaaS to do a simple task. FreeTools is a collection of 22 browser-based utilities that run entirely client-side. No accounts, no data collection, no server calls.
Link: docat0209.github.io/free-tools
What is included:
- Developer tools: JSON formatter, regex tester, Base64 encoder, diff checker, JSON-to-YAML converter, UUID generator
- Text tools: Markdown preview, word counter, text case converter, lorem ipsum generator
- Conversion tools: CSV to JSON, timestamp converter, URL encoder/decoder, number base converter, HTML entities
- Business tools: Invoice generator, privacy policy generator, password generator, QR code generator
Everything runs in your browser tab. Open it, use it, close it. No data leaves your machine.
Why it matters: Bookmark it once and stop Googling "json formatter online" five times a week.
4. GitHub Copilot Free -- AI Completions in Your Existing Editor
GitHub launched a permanent free tier for Copilot in late 2024, and it is genuinely useful. You get 2,000 inline suggestions per month and 50 premium requests for chat and agent mode. It works in VS Code, JetBrains, and Neovim.
Install: Enable it at github.com/features/copilot. Sign in with your GitHub account.
What you get for free:
- 2,000 code completions/month
- 50 chat and agent requests (Claude Sonnet 4.6, GPT-4.1)
- Multi-file editing in agent mode
- Works across VS Code, JetBrains, Neovim
Why it matters: If you already use VS Code and do not want to switch editors, this is the lowest-friction way to add AI to your workflow. The 2,000 completions per month covers most hobby and side-project usage comfortably.
5. v0 by Vercel -- Generate UI Components from Text Prompts
Describe the UI you want in plain English, and v0 generates production-ready React + Tailwind code. The free tier gives you $5 in monthly credits (roughly 200 generations), which is more than enough for prototyping.
Link: v0.dev
Example prompt:
"A pricing card with three tiers, a toggle for monthly/yearly billing, and a highlighted 'Popular' badge on the middle tier."
v0 generates the component, renders a live preview, and gives you copy-paste code. It uses shadcn/ui components by default, so the output integrates cleanly into existing Next.js projects.
Why it matters: Building UI from scratch is slow. v0 handles the 80% -- layout, responsive design, component structure -- so you can focus on the 20% that makes your product unique.
6. Free MCP Plugins -- One-Click Claude Extensions (Weather, Currency, Country, Dictionary)
These are pre-configured MCP servers packaged as Claude Desktop Extensions (.mcpb files). Download, double-click, and Claude gets a new capability. No terminal, no JSON config, no API keys.
Available for free:
- Weather -- current conditions and forecasts via Open-Meteo (download)
- Currency -- live exchange rates for 30+ currencies via Frankfurter API (download)
- Country -- population, capital, languages, and more via RestCountries (download)
- Dictionary -- word definitions, pronunciation, and examples via Free Dictionary API (download)
Why it matters: MCP servers usually require terminal setup. These skip that entirely. If you use Claude Desktop and want to try MCP without touching a command line, start here. All four use public APIs with no authentication required.
7. Biome -- Linting and Formatting at 20x the Speed
Biome replaces both ESLint and Prettier with a single tool written in Rust. It formats 10,000 files in 0.3 seconds (Prettier takes 12 seconds) and lints them in 0.8 seconds (ESLint takes 45 seconds). It ships with 450+ rules and 97% Prettier compatibility out of the box.
Install:
npm install --save-dev --save-exact @biomejs/biome
npx @biomejs/biome init
That creates a biome.json with sane defaults. No plugins to install, no .eslintrc to configure, no Prettier-ESLint conflicts to debug.
What you get:
- Lint + format for JS, TS, JSX, JSON, CSS, and GraphQL
- Zero config required (works out of the box)
- 450+ lint rules with clear error messages
- Import sorting built in (no separate plugin)
Why it matters: I switched a monorepo from ESLint + Prettier to Biome and the CI pipeline went from 45 seconds to under 2 seconds. The migration took 20 minutes. If your lint step is the slowest part of your CI, try this.
The Common Thread
Every tool on this list follows the same pattern:
- Free to start -- no credit card, no trial countdown
- Solves one thing well -- not a platform, not a suite, just a tool
- Works immediately -- install and use in under 2 minutes
The best developer tools are the ones you actually use. Bookmark the ones that solve a problem you have today and skip the rest.
Which free tool has saved you the most time this year? Drop it in the comments -- I am always looking for tools to add to my workflow.
If you found this useful, follow @docat0209 -- I write about AI-assisted development and developer tools every week.
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