Cubic

cubic, backed by Y Combinator, is an AI code review platform used by n8n, Cal.com, and Better Auth that analyzes pull requests and entire codebases for bugs, security vulnerabilities, and quality issues, delivering feedback directly in GitHub and the IDE. It provides instant inline PR reviews with automated bug detection and coding-standard enforcement, auto-generated PR summaries, one-click automated fixes, nightly codebase scans across multiple repositories, plain-English custom rule configuration, and a learning capability that adapts to a team's patterns by analyzing how senior developers actually comment on code. Integrations reach Jira, Linear, Notion, and Confluence. Pricing is transparent and tiered: Starter (free, 20 PR reviews/month), Team ($30/month per developer, 40k lines reviewed), Pro ($79/month per developer, 80k lines with faster processing), and Enterprise (custom) — with free access for public/open-source repos. Good fit for a team that wants AI code review that actually learns from how their senior engineers already review code, rather than applying generic rules uniformly.