HeyDeer

HeyDeer is a coding tool. HeyDeer reviews GitHub pull requests with multiple AI models, verifies findings, and can open fix PRs. Teams add custom repository checks as Markdown files. Pricing has a free tier and paid plans from $9 a month with no seat fees.

HeyDeer is an AI code review service built around GitHub pull requests. When a PR is opened, separate AI reviewers examine the change from independent perspectives, the findings are checked against the code, and the results are combined into a single review that is posted by a bot. Each finding carries a priority and a short explanation, often with a suggested code change, so reviewers can see why something was flagged rather than reading a wall of generic comments. The product is aimed at development teams and individual developers who want automated review without per-seat pricing. Paid plans are priced per usage rather than per developer, and the homepage states that any number of developers can be covered. The review models come from OpenAI and Anthropic, and reviews run in isolated environments provided by Vercel Sandbox. HeyDeer positions itself on signal over volume: the pitch is fewer false positives, and the site links to a research page that describes its evaluation of review quality, based on more than 6,000 internal review runs. In practice there are three working parts. Reviews run at a Standard depth for everyday changes or a Deep depth for complex code, billed by usage. Repository checks let a team define its own rules as Markdown files in an .agents/checks folder, each handled by a dedicated reviewer scoped to matching files, such as React best practices or dependency rules. Finally, the fix workflow lets a user pick findings, add instructions, and have HeyDeer open a separate fix PR against the original branch. The original branch stays untouched until the fix PR is merged, and the PR includes the changes, skipped findings and local test results. Among alternatives, HeyDeer competes with other GitHub-centered AI review bots. Its distinguishing points are the multi-model verification step, team-defined checks living in the repository, and a pricing model without seat fees. A free plan with monthly credits and a demo review make it easy to judge on a real PR. The scope is GitHub only, so teams on other platforms are not served.