tools
Free AI Tools
Utilities for developers working with LLMs — no signup required.
free · first check no signup
AI Prompt Checker
Score your prompt 0-100 across clarity, specificity, structure, and robustness, with the issues to fix.
free · 1 run a day
A/B Prompt Tester
Paste two prompt variants, run both on the same model, and get a judged winner with per-criterion scores.
free · no signup
Token Counter
Count tokens for GPT-4, Claude, Gemini and more. With API cost estimate.
free · in-browser · no signup
Prompt Format Checker
Test a prompt against the official prompting guides of OpenAI, Anthropic (Claude) and Gemini — XML tags, sections, instruction placement, examples.