Free AI Tools
Utilities for developers working with LLMs — no signup required.
Nano Banana Prompt Checker
Check an image prompt against the Nano Banana and GPT Image 2.5 guides: negation, exact text in quotes, settings, edits, references. Copy the fixed prompt.
Veo 3.1 Prompt Checker
Catch what wastes a video generation (camera conflicts, "no …" phrasing, dialogue, settings in the text) and copy the fixed prompt. Also for Gemini Omni Flash.
AI Prompt Checker
Score your prompt 0-100 across clarity, specificity, structure, and robustness, with the issues to fix.
A/B Prompt Tester
Paste two prompt variants, run both on the same model, and get a judged winner with per-criterion scores.
Token Counter
Count tokens for GPT-4, Claude, Gemini and more. With API cost estimate.
Prompt Format Checker
Test a prompt against the official prompting guides of OpenAI, Anthropic (Claude) and Gemini — XML tags, sections, instruction placement, examples.