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Browser extension for ChatGPT
ChatGPT prompt checker
A free browser extension that reads your ChatGPT draft as you type: the token count and what it would cost on the API, any personal data or pasted secret (one click redacts it), the writing slips, and whether a smaller model would do. Runs in the page; nothing leaves your browser by default.
An e-mail address and a phone number, caught and redacted before send.
You write your prompt on ChatGPT, Claude, Gemini, Copilot or Perplexity exactly as you always do. A small pill sits by the box and keeps quiet.
The drafts are examples with made-up names, addresses and numbers - nothing here is a customer's prompt. Every price is a real quote from POST /api/v1/estimate against the public catalogue; the personal-data scan and Redact run in your browser with the extension's own patterns. Type in the composer to quote a draft of your own.
What ChatGPT does not show
Where the card appears
The card sits under ChatGPT's composer, in the same column, and updates with every keystroke. ChatGPT's own send button and model picker are untouched.
The model hint compares the task with GPT-5, GPT-5 mini, GPT-4.1 and o-series reasoning models and with every other model in the OpenSmartRoute catalogue; the recommendation comes from the same decision engine as the router behind the API. Counting, task detection and redaction run on your device.
What it does
The same card on every site it runs on - these are its rows as they appear under the composer.
E-mail addresses, phone, card and account numbers, API keys and tokens are spotted before they leave. Redact swaps them for placeholders in the draft itself; the mapping stays in the page so you can restore the answer.
The card knows whether a draft is a quick rewrite or a step-by-step analysis and compares that with the model the site's picker shows - so you switch to a fast model for the simple task and a thinking model for the hard one.
Filler, duplicated lines and stray whitespace are compacted in the draft when you ask - the card shows the tokens saved and you keep the wording.
One click quotes the same draft against every candidate in the catalogue: the router's pick, the cheapest and the best published quality, each with its estimated cost.
Switch on sharing and the extension reports the shape of each call - site, model, tokens, task - never the text. The Opportunity page in your workspace prices every call as you paid it and as the router would have routed it.
Download for Chrome
Edge
Firefox
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