Google Sheet
Also called spreadsheet interface · Sheets
A spreadsheet used as the interface and lightweight database for a DIY production stack, usually wired to an API through Apps Script.
In more detail
In this context a Google Sheet is doing three jobs at once: holding configuration such as which model and which prompt rules to use, acting as a simple database of past runs and outputs, and providing a usable interface without building one from scratch. That combination is what makes it a common front end for a bring-your-own-key tool built by one person rather than a software team.
Example
A single Sheet can hold a config tab with the model and word-count target, editable prompt fields for tone and structure rules, and a log of every script generated, all visible and editable without opening a code editor.
Why it matters
Everything the Sheet holds, prompts, settings, output history, is a plain file you can open, copy, or export at any time, which is the opposite of a hosted tool's dashboard that disappears if the subscription lapses. It is the reason a Sheet-based stack is comparatively easy to hand off, back up, or rebuild.