Drive a browser

Kernel

Cloud Chromium browsers for AI agents, controlled over CDP, Playwright or an API, with proxies, logins and replays.

Rate limits

API requests: Per organisation, per minute; the number is not published. Over the limit returns 429 with Retry-After3
Browser creation: Rate limited separately from concurrency; acquiring from a pool is not subject to it3
Rate limit numbers: Not published

Other limits

Concurrent browsers: 5 / 10 / 150 / custom by plan; standby browsers and reserved pool capacity count3
Memory per browser: Headful 8 GB (default) or 16 GB; headless 1, 2 or 4 GB3
Idle timeout: Default 60 s, max 72 h; billing stops after 5 s of inactivity (standby)2
App invocations: 5 / 10 / 50 / custom by plan3
Managed auth health check interval: 6 hours / 1 hour / 20 minutes minimum by plan3
Replay retention: 1 day / 7 days / 30 days / custom by plan2

Read from Kernel (kernel.sh)’s own pages on 2026-11-04. Every number links to the page a value came from. For agents, the same facts as markdown: /tools/drive-a-browser/kernel.md