Code Quality

5 open source tools compared. Sorted by stars — scroll down for our analysis.

Tool	Stars	Velocity	Language	License	Score
Prettier Opinionated code formatter	51.8k	—	JavaScript	MIT License	82
Ruff Extremely fast Python linter and formatter, written in Rust	46.7k	—	Rust	MIT License	82
ESLint Find and fix problems in your JavaScript code	27.2k	+27/wk	JavaScript	MIT License	79
Biome Toolchain for web projects — formatter and linter in one	24.2k	+118/wk	Rust	Apache License 2.0	77
OXC High-performance JavaScript tools (parser, linter, formatter)	20.3k	+191/wk	Rust	MIT License	77

Our Analysis

Prettier51.8k★

Prettier ended the code formatting debate by removing choice. Point it at your codebase, run it, and every file looks the same. No configuration bikeshedding, no team arguments about semicolons. That opinionated approach made it the default formatter for JavaScript, TypeScript, CSS, and more — with 51K stars and universal adoption. Biome is the new challenger: a Rust-based formatter plus linter that's 25x faster with 96% Prettier compatibility. dprint is another Rust alternative focused on speed. ESLint handles formatting through plugins but shouldn't — use it for linting, not styling. Use Prettier if you want the safest, most widely supported formatter with the largest ecosystem. Every editor, every CI system, every team knows it. The catch: Prettier is slow by modern standards. Formatting 10K files takes 12 seconds vs. Biome's 0.3 seconds. For most projects that doesn't matter, but in large monorepos, the difference is painful. Biome is production-ready now — if you're starting a new project in 2026, seriously consider it.

Ruff46.7k★

Ruff replaced Flake8, Black, isort, pyupgrade, and autoflake — all of them — with a single tool that runs 100-200x faster. Written in Rust by Astral (now part of OpenAI's Codex team), it lints and formats your Python in the time it takes Black to parse its config file. 900+ rules, near-identical Black formatting output, and it just works. There's no real competition anymore. Black is slower. Flake8 needs plugins for what Ruff does natively. pylint is comprehensive but glacial. Ruff is the default Python linter/formatter in 2026 — Django, Zulip, and most major projects have switched. Use Ruff for every Python project. No exceptions. Add it to your pre-commit hooks and CI pipeline today. The catch: it's not a type checker (use mypy or Astral's new ty for that). The pace of development means occasionally a rule behaves differently between versions — pin your Ruff version in CI. And the OpenAI acquisition raises questions about long-term open-source commitment, though the tools remain MIT-licensed for now.

ESLint27.2k★

ESLint is the undisputed standard for JavaScript linting — and v10 in 2026 finally removed the legacy eslintrc config entirely, making flat config (eslint.config.js) the only option. If you've been procrastinating that migration, time's up. After 10+ years, ESLint's plugin ecosystem is unmatched: React hooks, Next.js, TypeScript, Vue, accessibility, imports — there's a plugin for everything. The flat config system adds globalIgnores() and extends() helpers that fix the most confusing parts. Compared to Biome (10-100x faster, fewer plugins), ESLint wins on ecosystem. Compared to dprint (faster formatting), ESLint does more. Compared to nothing, ESLint catches real bugs. Use this on every JavaScript/TypeScript project. Period. Skip this only if you've fully migrated to Biome and your plugin needs are covered. The catch: Node.js-based means it's slow on large codebases — linting 10,000 files takes 45 seconds where Biome takes 0.8. And the flat config migration from eslintrc is a real time investment for existing projects with custom configs.

Biome24.2k★

Biome replaces ESLint and Prettier with a single Rust binary that's 10-100x faster. Format 10,000 files in 0.3 seconds instead of 12. Lint them in 0.8 seconds instead of 45. One config file, one tool, one set of opinions. The v2.3 release brings 423+ lint rules and type-aware linting — the gap with ESLint is closing fast. Migration from ESLint/Prettier is automated via biome migrate. 97% Prettier-compatible formatting means your codebase won't look different. Compared to ESLint + Prettier (more plugins, slower), Biome trades ecosystem for speed. Compared to dprint (fast formatter, no linting), Biome does both. Use this on every new JavaScript/TypeScript project. For existing projects, evaluate whether your ESLint plugins are covered by Biome's built-in rules first. Skip this if you depend on framework-specific plugins (React hooks, Next.js) that Biome doesn't cover yet. The catch: plugin ecosystem is the real gap. No eslint-plugin-react-hooks equivalent yet. Vue, Markdown, and YAML support is incomplete. And switching means your team learns a new tool — the speed gains need to outweigh the transition cost. Apache 2.0 license.

OXC20.3k★

OXC is a bet that JavaScript tooling should be 100x faster. Built in Rust by the team behind Biome contributors, it's a parser, linter, formatter, resolver, and transformer — all in one project, all blazingly fast. Think of it as the "rewrite everything in Rust" movement applied to your entire JS toolchain. The linter alone is 50-100x faster than ESLint. The parser is used by Biome and Rolldown (Vite's future bundler). If you're tired of slow CI pipelines and linting that takes minutes, OXC is the future arriving early. Biome is the closest alternative — also Rust, also fast, but focused on formatting and linting. ESLint is the incumbent with the ecosystem but can't compete on speed. Prettier is formatter-only and JavaScript-speed. Best for teams with large codebases where lint/format time actually hurts. If you're a solo developer with a small project, ESLint is fine. The catch: it's still maturing. Not all ESLint rules have equivalents yet, and the ecosystem of plugins is thin. You're betting on the future, not the present.