Settings

Models, generation defaults, and where your data lives.

Gemini API key

SIGIL never calls Google from the browser. Requests go to this application's own server routes, which hold the key.

Checking for a server-side key…

Use my own key insteadStored in this browser's local storage and sent to SIGIL's own server on each request. Convenient for trying the app; a server-side environment key is safer.

Get a key from Google AI Studio

Models

Defaults come from environment variables. Anything set here overrides them for this browser.

Text modelInterview and quick structured work

Latest Flash reasoning model. Recommended default.

Reasoning modelBrief, directions, critique, iteration

Latest Flash reasoning model. Recommended default.

Image modelExploration batches — speed matters here

Nano Banana 2 — fast, ideal for large exploration batches.

Finalist image modelLockups and delivery assets — fidelity matters here

Nano Banana Pro — highest fidelity, best for finalists and delivery.

Generation defaults

Starting values for new runs. Every stage lets you change them before generating.

Batch concurrency1–8 · lower this if rate limited

Automatic retriesPer failed image, 0–5

Creative directionsDefault count

Concepts per directionDefault count

Variations per refinementDefault count

Image aspect ratio

Local storage

Projects and generated artwork live in this browser's IndexedDB. They survive refreshes and restarts, and never leave your machine except as the prompts sent to Gemini.

Security model

· The API key is read server-side and travels to Google in a request header — never in a URL, never in the client bundle.
· Error messages are scrubbed for key-shaped strings before they reach logs or the browser.
· Client information is sent to Gemini only as part of the prompts needed to do the design work.
· A browser-stored key, if you choose one, is held in local storage and is readable by anything running on this origin. Prefer the environment key.