AI Cost —Token Counter & Cost Calculator

你人工智能提示背后的每一个数字。免费，无需注册。

Tired of guessing how much your AI prompts cost? 7 free tools in one place — token counter, cost calculator, context window visualizer, monthly budget planner, throughput timer, and tokens↔words converter. Works with GPT-4o, Claude Sonnet, Gemini, Llama. Uses real tiktoken library for accurate counts. Includes a prompt optimizer that strips filler words to save tokens. Zero backend. Everything runs in your browser. No account, no data stored.