# Welcome to Haystack

Introduction to Haystack's AI code review and QA platform.

## Overview

Haystack gets your human code review time to zero. It reads the transcript and the changes behind every PR, tests the risky ones end-to-end in cloud sandboxes, and only pulls a human in when something genuinely needs one.

## What Haystack Does

- **Triage on every PR**: rating, concrete findings, and a safe-to-merge verdict
- **Risk-based QA**: verification flows build and exercise your app in a cloud sandbox
- **Merge queue**: rebases, resolves conflicts, retries CI, auto-fixes straightforward findings
- **Smart inbox**: a card feed that surfaces the one PR that needs your attention
- **AI reviewer aggregation**: CodeRabbit, Copilot, Greptile, and 10+ AI reviewers in one view
- **PR chat with coding-agent context**: trace changes, ask anything

## Next Steps

1. [Try Haystack](/docs/trying-out-haystack) - Test on a PR without installing anything
2. [Install Haystack](/docs/installing-haystack) - Set up the GitHub App
3. [Learn Features](/docs/pr-chat) - Explore PR Chat and other features