Observed arrival · 2026-09-27

Ninebrains: parallel coding agents, separated by worktree

ninebrains.dev Visit website

Editorial interest 78/100 Selection signal · not a rating of the site

Ninebrains presents a free, open-source desktop app for coordinating Claude Code, Codex, and OpenCode agents across macOS, Windows, and Linux.

Landing page captured for the 2026-09-27 issue.

For: Developers coordinating multiple coding agents on one repository
Worth noticing: The page describes up to four lanes per tab, with verification gates allowing three attempts before a job fails.

Field notes

The Brain is described as turning a brief into jobs with dependencies, then assigning each ready job to an idle lane. The example shows a screenshot check catching a navigation overlap at 390 pixels, sending feedback, and allowing a second attempt. The page lists Claude Code, Codex, and OpenCode, and provides install commands for the supported desktop platforms.

Observed signals

Read the marks

Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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