Tokensense

Tokensense-Ai is a free LLM token cost calculator built for developers, AI engineers, and prompt designers who want to estimate API costs before going live. When you build with large language model APIs like OpenAI, Anthropic Claude, or Google Gemini, you're billed by the token — not the word, not the character. A single system prompt, a long user message, or an attached file can quietly balloon your cost-per-call. Tokensense-Ai makes that visible.