Score the structure of any AI prompt, then rewrite it
Prompt Analyser checks any prompt for the seven parts a reliable one has — role, task clarity, context, constraints, output format, examples and specificity — shows which are missing, and rewrites it using patterns drawn from production agent prompts. The score counts parts, not prose; the rewrite is what reads what you actually wrote. Scoring is free, unlimited, and runs in your browser.
Your prompt
Scoring runs in your browser — instant, offline, unlimited, no account. The AI rewrite runs on the server against the prompt corpus: sign in for 3 a day free, unlimited with a pass.
Proof desk
Start typing. The marks appear as you write.
- Where context, role or constraints are missing
- What already reads well enough to leave alone
- The corpus pattern each suggestion comes from
No prompt handy? Load a sample from the menu on the left.
Nothing filed yet. Analyse a prompt and choose “Save to library” to keep it here.
What it scores
Every prompt is measured against seven dimensions. The percentage is how much each one moves the overall score.
- Role / persona12%
- Who the model should be. Naming a persona sets the vocabulary, the depth, and the default assumptions for everything that follows.
- Task clarity22%
- What you actually want done, stated as a clear instruction rather than a topic. The heaviest-weighted dimension.
- Context20%
- The facts the model needs but cannot infer — the audience, the inputs, what already exists, and what counts as success.
- Constraints14%
- The boundaries: length, tone, what to avoid, what must be included. Constraints are what keep an answer on scope.
- Output format16%
- The exact shape the answer should take. Specifying JSON, a table, or a word count removes the most common reason a response gets thrown away.
- Examples (few-shot)8%
- One input-output pair, which anchors tone, format, and edge handling far more efficiently than describing them.
- Specificity8%
- Concrete nouns and numbers instead of vague qualifiers. "Under 120 words" is scoreable; "keep it short" is not.
Common questions
What does Prompt Analyser cost?
Scoring is free and unlimited, with no account required. The free plan also includes 3 AI rewrites per day. To lift that cap you buy a one-time pass — Day pass, Week pass or Month pass. Passes expire on their own; nothing auto-renews and there is no subscription to cancel. Pricing is shown in rupees inside India and dollars elsewhere. See passes.
How is the score calculated?
By a transparent heuristic, not a model judgement. Each of the seven dimensions is scored 0–100 by pattern checks and combined as a weighted mean, using the weights listed above. Because it inspects structure rather than meaning, a high score means a prompt covers the things strong prompts usually cover — not that its content is correct.
Does my prompt leave the browser?
Scoring does not: it runs entirely in your browser with no network request, which is why it is instant and unlimited. The AI rewrite is different — it posts your prompt to the server, which calls the Anthropic API to generate the rewrite.
What is the difference between the suggested rewrite and the AI rewrite?
The suggested rewrite is a template assembled from your own text plus the dimensions you are missing — instant and offline. The AI rewrite sends the prompt to a model along with matching patterns retrieved from the corpus, and returns a version written for the specific agent you selected.
Which AI tools does it target?
12 of them, including Cursor, Claude, ChatGPT, Gemini, v0, Devin, Windsurf, Replit Agent and Perplexity. Choosing a target changes which corpus patterns are retrieved, so the rewrite matches that tool's conventions.