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AI Prompt Analyzer
Paste a ChatGPT, Gemini or Claude prompt and get a score out of 100: five checks of 20 points, each with a one-line reason and a tip for the biggest gaps. Free, no sign-up, and it runs in your browser.
Paste your prompt to score it
How the score works
Five checks, 20 points each: is the task clear, is there context, is the output format named, are there limits, and are there concrete details. Each check looks for signals in your words, such as an action word, who it is for, a word count, a "do not" rule, or a name or number. Vague words like "good" or "stuff" take points off details.
The score is a guide to what is missing, not a promise of a good answer. It reads your words with fixed rules and cannot judge your idea. A short prompt can still work well for a simple question. Writing a new one? Print the free prompt-writing checklist with the same 5 checks.
The 5 checks behind the score
An AI cannot ask what you meant before it starts. When you paste a short request like "write a blog post", it has to guess the reader, the length, the tone and the details. The analyzer gives up to 20 points for each of five checks, so you can see which part of your prompt leaves the most to guesswork.
| Check (20 points) | What earns points | How to add it |
|---|---|---|
| Clear task | An action word near the start, a named result (email, list, plan), or a direct question. | Start with the action: Write a 3-paragraph cover letter for... |
| Context | A role for the AI, who the result is for, and a line about your situation. | Act as a hiring manager. It is for a junior marketing role. I have 2 years in social media. |
| Output format | A layout (bullets, table, steps), a length, and a tone or style. | 5 bullet points, under 150 words, warm and plain. |
| Limits | Rules on what to avoid, hard limits, and a guard against made-up facts. | Do not use jargon. Do not invent numbers; ask me if something is missing. |
| Concrete details | Numbers, names and examples. Vague words like "good", "nice" or "stuff" take points off. | Swap "a good post" for a 300-word post for first-time home buyers in Leeds. |
Scores of 80 or more mean the AI has most of what it needs. Under 40 means it knows little more than the topic. The Prompt Optimizer uses the same checks and adds what is missing for you, and our guide to writing AI prompts explains each part with examples.
Explore all free prompt tools
Prompt Idea Generator
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Open Generator →Prompt Optimizer
Get a clearer version of your prompt side by side with the original, plus a list of what changed and why.
Open Optimizer →Prompt Converter
Translate prompt framing between ChatGPT, Claude, Midjourney parameter tags, and video tools like Veo and Kling.
Open Converter →Questions, answered
How does the Prompt Analyzer work?
It scores your prompt out of 100 using five checks of 20 points each: a clear task, context, an output format, limits and concrete details. Each check comes with a one-line reason, and the two weakest checks get a tip on what to add.
Does a high score mean the AI will give a good answer?
No. The score is a guide to what is missing, not a promise of a good result. It looks for signals in your words with fixed rules, so it cannot judge whether your idea or facts are right. A short prompt can still work well for a simple question.
Does the analyzer send my prompt to a server or external AI?
No. The score is worked out in your browser. No AI service is called, and your text is not sent or saved anywhere.
Can I use this tool for image or video prompts?
Yes, though the checks are built mostly for text prompts. For image and video prompts with camera, lighting and style words, the Prompt Doctor gives more specific fixes, and the Prompt Converter adapts a prompt for a different AI tool.