Parallax (YC S26) – A live reviewer running alongside each coding agent

Parallax, a Y Combinator S26 startup, launched a live code reviewer that runs alongside coding agents and found 2.24 real, merge-blocking problems per pull request on Martian's open Code Review Benchmark, more than any of the 20 other tools tested. The tool reviews the full agent session rather than only the diff, routes review work through the Conifer router to reviewers from labs other than the one that wrote the code, and automatically switches between connected Claude and Codex subscriptions when one hits its usage limit. Parallax is free to start with $50 of Conifer credit and 5 free reviews on GitHub sign-up, with macOS and Linux builds available.

Parallax A new perspective on parallel work. $50 of Conifer credit and 5 free reviews when you sign up with GitHub. Control all of your agents through the Captain. It keeps them aligned with you. Captain Done. Two pull requests, as you asked. CSV export for billing Claude CodeDone Pull request 745 Stop webhook drops CodexDone Pull request 746 Tests for both Cursor AgentDone All tests passing 2.24 real, merge-blocking problems found per pull request Native code review that's better than anything on the market. On Martian's open Code Review Benchmark, Parallax found more real, merge-blocking problems per pull request than any of the 20 other tools. billing/export.ts +4 const rows = groupBy invoices, "customerId" Review bot Looks good. The grouping is clean and the stream is closed. Parallax You asked for one row per invoice. This groups invoices by customer, so three invoices for one customer export as one row. A test with exactly that fails on this change. for const customer, items of rows { stream.write toCsv customer, items } It reads the session, not only the diff. Agents write better code now. When work goes wrong, it is usually because the session drifted from what you meant. Parallax keeps the whole session and reviews the work against it. The Conifer router picks the best reviewers from labs other than the ones that wrote the code. Automatically switch between subscriptions without losing progress. Connect several Claude and Codex subscriptions. When one hits its limit, Parallax automatically moves the work to the next. Personal 1 Claude Max 100% of this week's limit used Personal 2 Claude Max 73% of this week's limit used Personal 3 Claude Pro 12% of this week's limit used Conifer credit after every plan $50 of credit left Every agent you already use, in one place. Amp and Capy too, and the sessions you run in Codex cloud and Claude Code on the web. - Claude Code - Codex - Cursor - Gemini CLI - OpenCode - pi Get Parallax Free to start, with $50 of Conifer credit and 5 free reviews when you sign up with GitHub. After it opens Parallax opens on its sign-in page. Continue with GitHub and your new account comes with $50 of Conifer credit and 5 free reviews. If you sign up with an email instead, link GitHub in Settings and the credit arrives then. No Claude or ChatGPT plan? Your agents can run on the credit. The first chat keeps a checklist for the rest, from adding a Claude or Codex account and connecting GitHub to starting your first session. First open from the .dmg 1. Open the .dmg and drag Parallax to Applications. 2. Open Parallax from Applications. It is notarized by Apple, so macOS only asks once whether to open it: click Open. On Linux Unpack parallax-linux-amd64.tar.gz https://www.conifer.build/api/download/parallax/parallax-linux-amd64.tar.gz?src=parallax-page the arm64 build is on the releases page https://github.com/ConiferKit/parallax-releases/releases/latest and run ./parallax daemon in that folder. Open http://127.0.0.1:7878 in a browser to use it. There is no native window on Linux yet.