About AI Token Counter

What Is This Tool?

AI Token Counter is a free online tool that helps developers and AI practitioners understand and manage their API costs. With the explosion of AI applications, understanding token counts has become essential for budgeting and optimization.

Why We Built This

As AI developers ourselves, we constantly needed to:

  • Estimate costs before making API calls
  • Optimize prompts to reduce token usage
  • Compare costs across different providers
  • Stay within context limits

Existing tools were either limited to a single provider, required signup, or didn't show cost comparisons. We built the tool we wished existed.

How It Works

Token Counting

We use an algorithm that approximates OpenAI's cl100k_base tokenization, which is used by GPT-4 and GPT-3.5 models. For Claude and Gemini, token counts are estimates since their exact tokenizers aren't publicly available. Our estimates are typically within 5-10% of actual counts.

Cost Calculation

We maintain up-to-date pricing for all major AI providers:

  • OpenAI: GPT-4, GPT-4o, GPT-3.5, o1 models
  • Anthropic: Claude 3.5 Sonnet, Claude 3 Opus, Claude 3 Haiku
  • Google: Gemini 1.5 Pro, Gemini 1.5 Flash, Gemini 2.0
  • Meta: Llama 3.1 models (via inference providers)

Pricing is updated regularly, but always verify with official documentation for production use.

Privacy First

All processing happens in your browser. Your text is never sent to our servers or any third party. When you close the page, your data is gone — we have no record of it.

Free Forever

This tool is completely free with no signup, no limits, and no premium tier. We believe developer tools should be accessible to everyone.

Accuracy Note

While we strive for accuracy, token counts and costs are estimates. Different tokenizers produce different counts, and pricing changes frequently. For production applications, always verify with the official API documentation and test with actual API calls.

Feedback

Found a bug? Have a feature request? We'd love to hear from you. This tool is continuously improved based on user feedback.