App limits

Use these limits when preparing an app for validation, upload, and review.

Limit	Current bound
Rendered frame	64×32 pixels
Top-level Starlark files	Exactly one
Source encoding	Non-empty UTF-8, no NUL bytes
Source size	128 KiB maximum
Review preview	Non-empty WebP, 2 MiB maximum
Local validation render	1 second maximum
Local push render timeout	30 seconds
Developer projects	5 per account during developer preview
Saved developer source	50 MiB per account during developer preview
Review submissions	3 per account in any 24-hour period
Project resubmission	1 per project per hour
Active submission	One queued or in-review submission per project

MCP tools also enforce field-specific bounds, UUID formats, settings schemas, rate limits, and confirmation for destructive actions.

These developer-preview limits may change before public launch. A passing browser preview confirms local behavior, not hosted review or physical-display readiness.

Last modified on September 2, 2026

App runtime

Platform