How does the AI prompt checker score my prompt?

It checks your prompt against seven prompt-engineering best practices: assigning a role or persona, stating a clear task, supplying context, including an example, specifying the output format, setting constraints, and being specific enough. Each met criterion adds to a weighted score out of 100. It is a transparent heuristic that runs in your browser — not an AI judgement — so the same prompt always gets the same score.

Is the prompt checker free and private?

Yes. It is completely free with no sign-up. The analysis runs entirely in your browser using JavaScript — your prompt is never uploaded, logged, or stored anywhere.

What makes a good AI prompt?

Strong prompts give the model a role, a specific task, the context and inputs it needs, at least one example of the desired output, an explicit output format, and clear constraints (length, tone, audience, what to avoid). The more of these you provide, the more reliable and consistent the response.

Does this work for ChatGPT, Claude and Gemini?

Yes. The best practices it checks — role, task, context, examples, output format and constraints — apply to every major large language model, including OpenAI GPT, Anthropic Claude, Google Gemini, and open models like Llama and Mistral.

Where can I get ready-made high-quality prompts?

GeraPrompts is a marketplace of vetted, runnable prompts, skills, and plugins from verified creators. Browse the catalogue, or read the free prompt engineering guides for templates you can copy.

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AI Prompt Checker

Paste any prompt and get an instant quality score out of 100, plus specific fixes for the parts that make AI answers vague or inconsistent.

Quick answer

A good AI prompt does six things: it assigns the model a role, states a specific task, supplies the context and inputs, shows at least one example, names the output format, and sets constraints (length, tone, audience, what to avoid). The checker below grades your prompt against these — score 85+ and it is well-structured; below 65 the model is guessing on too much.

Paste your prompt

Runs entirely in your browser. Nothing is uploaded, logged, or stored.

0 words

What a strong prompt includes

The checker uses the same rubric taught across our free prompt engineering guide. These six ingredients work on every model — OpenAI GPT, Anthropic Claude, Google Gemini, and open-source models alike:

Role / persona
Who the model should act as.
Specific task
The exact thing to produce, led by a verb.
Context & inputs
The background, data, or source text.
Examples (few-shot)
One or two ideal input→output pairs.
Output format
JSON, a table, N bullets, markdown…
Constraints
Length, tone, audience, what to avoid.

Frequently asked questions

How does the AI prompt checker score my prompt?: It checks your prompt against seven prompt-engineering best practices: assigning a role or persona, stating a clear task, supplying context, including an example, specifying the output format, setting constraints, and being specific enough. Each met criterion adds to a weighted score out of 100. It is a transparent heuristic that runs in your browser — not an AI judgement — so the same prompt always gets the same score.
Is the prompt checker free and private?: Yes. It is completely free with no sign-up. The analysis runs entirely in your browser using JavaScript — your prompt is never uploaded, logged, or stored anywhere.
What makes a good AI prompt?: Strong prompts give the model a role, a specific task, the context and inputs it needs, at least one example of the desired output, an explicit output format, and clear constraints (length, tone, audience, what to avoid). The more of these you provide, the more reliable and consistent the response.
Does this work for ChatGPT, Claude and Gemini?: Yes. The best practices it checks — role, task, context, examples, output format and constraints — apply to every major large language model, including OpenAI GPT, Anthropic Claude, Google Gemini, and open models like Llama and Mistral.
Where can I get ready-made high-quality prompts?: GeraPrompts is a marketplace of vetted, runnable prompts, skills, and plugins from verified creators. Browse the catalogue, or read the free prompt engineering guides for templates you can copy.

Keep going

Once your prompt scores well, find vetted, ready-to-run prompts and skills — or learn the techniques behind the rubric.