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What is Prompt A/B Tester?

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Prompt A/B Tester is one of our Developer Tools. Compare two system prompts side-by-side. Run the same user input through both and vote on which response is better. Work through the questions at your own pace and get a structured result at the end, with an explanation of what it means. It runs on our servers, so it needs a free AnythingText account to use — AI-powered tools may also require an active plan. More in this collection: A toolkit for software engineers.

How to use Prompt A/B Tester

  1. 1

    Sign in to AnythingText with your Google account.

  2. 2

    Open Prompt A/B Tester and start the questions.

  3. 3

    Answer honestly — there is no timer and nothing is shared while you work.

  4. 4

    Read your result, including what each part of the score means.

Key Features

Explained results

Your score comes with what it means, not just a number.

Private by default

Answers are not published and nothing is shared unless you share it.

Processed, not stored

Your input is used to produce the result and is not kept afterwards.

Works on any device

Full functionality on phone, tablet, and desktop.

Who Is This For?

Personal insight

A structured result instead of guesswork.

Coaches and teachers

A consistent starting point for a conversation.

Self-review

Re-take it later and compare against where you were.

Frequently Asked Questions

Is Prompt A/B Tester free?

You need a free AnythingText account to use it, because it runs on our servers rather than in your browser. AI-powered tools also draw on a paid plan — the pricing page lists what each plan includes.

Do I need to create an account?

Yes — sign in with Google and you can start straight away. The account exists so the server-side run can be attributed and rate-limited fairly.

What happens to my data?

Your input is sent to our server, used to produce the result, and not stored afterwards. Tools that call an AI provider are covered in detail on our AI processing page.

Is my result shared with anyone?

No. Your answers and your result stay on the page. Nothing is published and nothing is sent anywhere unless you choose to share it.

Do I need to install anything?

No. Prompt A/B Tester runs in the browser on desktop, tablet, and phone. There is nothing to download and nothing to keep updated.

More detail on plans is on our pricing page, and how AI-powered tools handle your data is covered on the AI processing page.

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Quick Start

Use your API key in the X-API-Key header:

curl -X POST https://anythingtext.com/api/tools/case \
  -H "Content-Type: application/json" \
  -H "X-API-Key: atk_your_key_here" \
  -d '{"text": "hello world", "mode": "upper"}'

See API Documentation for all available endpoints.

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