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Prompt Scripter

Live product: a Chrome extension that runs one prompt template over a list of rows in ChatGPT, Claude and Gemini, with accounts, per-plan limits and Stripe subscriptions behind a FastAPI backend.

The Problem

Asking the same question forty times with one word changed. Anyone who can call an API solves this in an afternoon — which is exactly why the people doing the retyping never solve it: they are not going to write a script.

The Solution

A Manifest V3 extension that types into the chat you are already signed in to: a prompt saved with blanks, a list of rows, one run per row, and the answers kept together. It connects to nobody's systems and needs no API key. Behind it, a FastAPI and SQLModel backend holds accounts, templates, datasets, run history and the per-plan limits, with Stripe as merchant of record for the paid tier.

Tags

Chrome MV3TypeScriptFastAPIStripe

Outcomes

  • Live in the Chrome Web Store and at promptscripter.javieraguilar.ai
  • Runs in ChatGPT, Claude and Gemini — no API key, nothing to configure
  • Billing proven end to end on live Stripe: checkout, signed webhook, subscription, customer portal, cancellation and refund