Free AI & Developer Tools

5 tools. No accounts, no paywalls, no tracking. Everything runs in your browser.

Prompt Injection Tester
Check a prompt against a live corpus of real injection attacks
no key needed dataset-backed LLM Refusal Detector
Detect soft refusals in model output — the failures that look like success
no key needed dataset-backed LLM Cost Calculator
What your prompt actually costs, across every major model
no key needed LLM JSON Repair
Fix the truncated JSON your model returned
no key needed Prompt Optimizer
Rewrite a weak prompt into one that actually works
bring your own key