Quick Answer: The AI Prompt Tester analyses any prompt against the STCO framework — System, Task, Context, and Output — returning a 0–100 quality score with per-component feedback. It works across all major AI models including ChatGPT, Claude, and Gemini. Your prompt is never stored.
Free AI Tool · Zero Data Retention
AI Prompt Quality Scorer
Paste any prompt below and our AI will score it against the STCO framework — System, Task, Context, Output — with specific improvement feedback.
Your prompt is never stored, logged, or tracked. Privacy by design.
3,000
What is the STCO Framework?
STCO stands for System, Task, Context, Output — a structured prompt engineering framework that reduces AI hallucinations by up to 73%. Instead of writing unstructured paragraphs, you break your prompt into 4 clear components.
Learn more: Complete STCO Guide · STCO vs Other Frameworks · Best Practices
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Frequently Asked Questions
Is my prompt stored or logged?
No. Your prompt is processed entirely in memory and immediately discarded. We never write it to any database, log, or analytics system.
What AI model powers the scorer?
We use Google Gemini Flash via Vertex AI for fast, accurate evaluations against our STCO framework.
How many times can I use this?
The tool is free with a fair-use rate limit of 5 scores per minute to prevent bot abuse.