Zymbiotech Tools · Runs locally

See your tokens
before you spend.

Count and visualize how an LLM actually splits your text — exact for OpenAI, a calibrated estimate for Claude and Gemini — with context-window fit and cost.

Runs in your browser · text never leaves it
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Token boundaries

Alternating shading = one token each. Exact view available for OpenAI models.

Type something above.

Context-window fit

How much of each common context window your text fills (using the selected model's count).

Cost

Prices change constantly, so nothing is hardcoded — put in the rate from your provider and it computes.

$0.000000
On accuracy. OpenAI counts use the real tokenizer (cl100k / o200k), loaded once in your browser — these are exact. Claude and Gemini do not publish a client-side tokenizer, so those numbers are a calibrated estimate (treat as roughly ±15%). We won't show a fake "exact" where none exists. The token-boundary view is only shown for models we can tokenize exactly.