Instant Analysis Optional AI Rewrite

Prompt Analyzer

Transform your basic prompts into powerful AI instructions. Instant analysis, no account needed.

✓ Free instant heuristic scoring
✓ Instant browser analysis with secure API-based rewriting
✓ Improve prompt quality with optional AI rewriting
✓ Get specific suggestions to fix weak prompts

Start Analyzing

Analyze instantly with no setup. Choose an API model only if you want AI rewriting.

Before

"Write a story"

📝

Score: 15/100

Very basic prompt

→

After

"You are an expert fiction writer. Write an engaging short story about a magical forest."

✨

Score: 85/100

Excellent prompt structure!

How it works

Analyze, improve, and perfect your prompts in three simple steps

1

Enter your prompt

Type or paste any prompt you want to analyze

2

Get instant feedback

See your score across 6 quality metrics with specific improvement suggestions

3

Optional AI improvement

Use an API model to automatically rewrite your prompt

Ready to analyze

1. Input

2. Analyze

3. Improve (Optional)

4. Export

📝 Your Prompt

Tip: Start with Analyze Instantly, then use Rewrite with AI if needed.

OpenRouter API models are available below for optional rewriting.

Quality Score

0/100

Detailed score calculation

Run an analysis to see per-criterion scores. 0%

⚠️ Suggested Improvements

Run an analysis to see targeted improvements.

Support Promptup

Promptup is 100% free to use, with no paywall. If this tool helps you write better prompts, your donation keeps it online, fast, and continuously improved for everyone.

Even a small contribution makes a real difference. Use the donation button in the top-right header or the widget below.