Biome
Toolchain for web projects — formatter and linter in one
The Lens
Biome replaces ESLint and Prettier in a single tool that's 20-35x faster, ending the configuration fights and slow lint runs. It formats and lints your JavaScript, TypeScript, JSX, JSON, and CSS in one pass. Written in Rust, so speed isn't a marketing claim. It's the whole point.
Everything is free for individual and team use. There's an 'enterprise' page on their site, but the core tool is fully open source under Apache 2.0. No features are gated. You install it, configure your rules, and run it.
The catch: Biome's rule set is still catching up to ESLint's plugin ecosystem. If you rely on specialized ESLint plugins (React hooks rules, accessibility linting, import sorting with custom groups), check that Biome covers your specific rules before migrating. The gap is closing fast, but it's not 1:1 yet.
Free vs Self-Hosted vs Paid
fully freeFully open source under Apache 2.0. The enterprise page appears to be for consulting/support services, not feature gating. Every formatting and linting feature is free.
Replaces two free tools (ESLint + Prettier), so the savings aren't monetary. They're in CI time and developer friction. A project that takes 45 seconds to lint with ESLint might take 1-2 seconds with Biome. Across a team of 10 running lint on every commit, that adds up to hours per week.
Free. Enterprise page is for support, not feature gating.
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