This is my submission for the Build With Gemma 4 prompt in the DEV Gemma 4 Challenge.

BriefBench is a small local-first web app that helps builders turn rough project notes into a structured decision brief. The goal is not to hide Gemma 4 behind a generic chat interface. The goal is to make the model's work visible: read context, explain the model choice, surface risks, propose a build plan, and suggest a story angle for a technical post.

What I Built

You paste messy notes about a project: users, constraints, privacy concerns, available hardware, and what you are trying to decide. BriefBench asks Gemma 4 to return strict JSON with:

summary

model rationale

risks

build plan

user experience notes

DEV post angle

assumptions

The UI then renders those sections as a scannable brief and lets you copy the result as Markdown.

Demo

Try the app here:

https://gemma-4-briefbench.vercel.app

The public demo runs in demo mode by default so anyone can test the full workflow immediately.…