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21st.dev

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What is 21st.dev?

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21st.dev, briefly

A sanity check for modern software projects. 21st.dev turns best practices into an automated audit, so your repo stops being a mystery box and starts being a roadmap. It surfaces what’s broken, what’s merely messy, and what to fix first—without another bloated dashboard.

What it actually does

It scans your codebase and workflow, flags technical debt across the usual suspects—performance, security, testing, docs, release hygiene—and translates those findings into actionable tasks. Think opinionated checklists with context, not hand-wavy “improve quality” vibes. Results are designed to live in your existing workflow, not sit in a PDF nobody reads.

Why you’d use it

You want signal, not status theater. 21st.dev gives you a shared source of truth, reduces bike-shedding in code review, and makes progress measurable over time. Less guesswork, fewer “we should”s, more done.

The fine print

It’s opinionated by design. That’s useful—until it isn’t. You’ll either align with its rules or consciously opt out. It won’t replace engineering judgment; it just forces better ones.

What features and use cases does 21st.dev offer?

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