Tools to break software — before your users do.
fixture.dev · Flawd · Support
Fixture builds sharp, focused developer tools for software quality — paid tools with free supporting courseware that teaches the craft behind them.
More of your code is written by AI than ever. Flawd tells you whether your test suite would notice if that code were wrong: it introduces small, realistic faults (mutations) into your codebase and checks that your tests catch them. Surviving mutants are gaps in your safety net.
- 🌐 Learn more: fixture.dev/flawd
- 📥 Download: flawd-releases — prebuilt binaries
- 🧪 Try it free: 14-day evaluation, no credit card required
- 📋 Lash — a minimalist, Markdown-native task tracker for developers and coding agents
- 🐢 Pageshell — a pragmatic shell for single-page apps, built on web components
- Browse the help center
- Reach us through the contact form
- Found a security issue? Please report it privately — see our security policy
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