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Prototype a small web app in Gemini Canvas

Use Gemini Canvas to prototype a small web app or page with a clear spec and test checklist.

GeminiCodingRuleStack original

Written for Gemini 4 Argon (Canvas) · Updated 2026-10-17

Note: Review and test before use. Provided as is, without warranty. See Terms.

In Canvas, build a [type of app, e.g. trip budget splitter] as a single web page.
Features: [list]. Data: stored in the browser only. Style: [style].
After it works, give me a test checklist of 5 things to try and note any limitations.

Replace everything in [square brackets] with your own details.

Settings & parameters

• Open Canvas in the Gemini app

Variations

• Landing page for a side project.
• Simple game for kids.

Tips

• Small, clear feature lists produce working prototypes.
• Do not put real personal data into prototypes.