AsyncReviewvsOpenReview
Generated from the two spec rows. Green marks the better value where a spec has a clear direction. Everything else is just different.
AsyncReview
AsyncFunc AI · Code review agent
#234OSS
Panel
5.91 spec wins
- Reliability
- 5.5
- Usefulness
- 5.8
- Cost
- 7.8
- Longevity
- 4.3
“It reviews issues as well as pull requests, so it can now explain that your bug report was also wrong.”
OpenReview
Vercel Labs · Code review agent
#226OSS
Panel
5.73 spec wins
- Reliability
- 5.8
- Usefulness
- 5.8
- Cost
- 6.2
- Longevity
- 5.0
“Review behaviour extends through skills in a .agents/skills directory, so your review bot now has a professional development plan.”
Spec by spec
| Spec | AsyncReview | OpenReview |
|---|---|---|
| Architecture | ||
| Category | Code review agent | Code review agent |
| Runs | local, sandbox | cloud, sandbox |
| Platforms | macos, linux, windows | web |
| Context window | not documented | not documented |
| Protocols | ||
| MCP client | No | No |
| MCP server | No | No |
| Capabilities | ||
| Runs terminal commands | YesThe agent writes and runs Python inside a REPL sandbox to verify findings, rather than executing shell commands in your repository. | Yes |
| Multi-file edits | No | Yes |
| Git operations | YesIt reads pull requests and issues through the GitHub API; the README documents no commit or branch operations. | Yes |
| Browser control | No | No |
| Sandboxed execution | No | YesEach review runs in an isolated Vercel Sandbox that is torn down afterwards. |
| Multi-agent orchestration | No | No |
| Headless / CI mode | Yes | Yes |
| Models | ||
| Backbone | Gemini | Claude Sonnet |
| Bring your own model | NoGEMINI_API_KEY is the documented credential; no other provider is named. | No |
| Local models | No | No |
| Cost | ||
| Pricing model | byok | byok |
| Starts at | $0/mo | n/a |
| Free tier | Yes | No |
| Bring your own key | Yes | Yes |
| Openness | ||
| Open source | Yes | Yes |
| License | MIT | unspecified |
| GitHub stars | 459 | 1,696 |
Which one would each critic pick
| Critic | AsyncReview | OpenReview | Pick |
|---|---|---|---|
| El Juez | — | — | not enough reviews |
| El Amigo | 6.0 | 5.8 | AsyncReview — Pick AsyncReview when you want a reviewer you run yourself from one command; pick cubic when you want a hosted bot that shows up on every pull request. |
| El Crítico | 5.8 | 5.3 | AsyncReview — It generates Python and executes it, and the only thing separating that code from the rest of the machine is an interceptor inside the same interpreter. |
| El Profesor | 6.5 | 7.0 | OpenReview — The review executes linters, formatters and the test suite inside the environment rather than reasoning about them, which is the only honest form of verification here. |
| La Inversora | 5.3 | 5.3 | no preference |
| La Jefa | 5.5 | 5.3 | AsyncReview — It costs nothing for sixty engineers and it runs unattended, and it wants a model key and a repository token stored wherever it executes. |
| El Hacker | 6.3 | 5.8 | AsyncReview — MIT and it runs straight from npx with no install, but exactly one model provider is documented, so there is no substitution and no routing. |
Picks are derived from each critic's own scores. Humans vote on matchups on the duels page.