Check my prompt

For everyone who talks to AI

Make AI do what you mean.

Paste your prompt. Find what's wrong. Get a version that actually works.

Check my prompt See how it works

No sign-up needed to see your first diagnostic.

How it works

  1. 01

    Paste

    Give Prompt.ist the prompt you were about to use.

  2. 02

    Diagnose

    We find ambiguity, missing context, contradictions, weak instructions and other problems.

  3. 03

    Improve

    Get a clearer, stronger prompt designed to produce a better answer.

One prompt, rewritten

The same request — before Prompt.ist and after.

Comparison: a vague marketing prompt is rewritten into a structured prompt with role, context, goal, audience, constraints, and expected output.

What Prompt.ist checks

Clarity

Detect vague or ambiguous instructions before they confuse the model.

Context

Find information the model needs but wasn't given.

Contradictions

Spot instructions that conflict with each other.

Output format

Make sure the requested answer has a usable structure.

Hallucination risk

Identify prompts likely to encourage unsupported assumptions.

Prompt efficiency

Remove unnecessary text and improve instruction hierarchy.

Works with the AI you already use

ChatGPT Claude Gemini Perplexity Copilot Other LLMs

Better prompts. Better answers.

You shouldn't need to become a prompt engineer just to get useful results from AI.

Building toward a full toolkit

A few things on the way, for when you need more than a quick check.

Coming soon

Prompt Debugger

Coming soon

Prompt Optimizer

Coming soon

Skill Creator

Coming soon

Security Checker

Coming soon

Hallucination Checker

Coming soon

Prompt Versions

Coming soon

Production-Ready Prompts

Before you ask AI, ask Prompt.ist.

Check a prompt