Free tools for ai / prompt engineering calculations and conversions. All tools run in your browser with no data sent to any server.
6
Tools
Free
Forever
100%
Private
All AI / Prompt Engineering Tools
AI Token Counter
Estimate tokens and characters for a prompt
OpenAI Cost Calculator
Estimate API cost from token counts
OpenAI Token Counter
Count tokens and estimate costs for GPT-5.x, GPT-4o, and other OpenAI models
Claude Token Counter
Count tokens and estimate costs for Claude Opus 4.6, Sonnet, and Anthropic models
Gemini Token Counter
Count tokens and estimate costs for Google Gemini 3 Pro, 2.5 Pro and Flash models
Llama Token Counter
Count tokens and estimate costs for Meta Llama 4, 3.3, and open-source LLM models