AI Token Cost Tracker

Track and estimate AI API token costs in real time across popular models.

Track exactly what you're spending on AI API calls before they happen. Token Cost Tracker estimates your input and output token counts in real time as you type or paste a prompt, then calculates the cost across today's most popular models — including Claude Opus, Sonnet and Haiku, GPT-4o, GPT-4o mini, Gemini 1.5 Pro and Flash, and GPT-3.5 Turbo. Features: — Instant token estimation as you type — Live cost breakdown for input and output separately — Side-by-side model comparison so you can pick the most cost-effective option — Adjustable output token estimator for realistic total cost previews — Budget cap with a visual progress bar and color-coded alerts (green / amber / red) — Session logger to track cumulative spend across multiple API calls — State persists between browser sessions — your prompt, model, and budget are remembered Who it's for: Developers, researchers, and power users who call AI APIs directly and want visibility into token costs before they hit their billing dashboard. Particularly useful when switching between models or optimizing long system prompts for cost efficiency. Privacy: No data ever leaves your browser. Token counting and cost calculations happen entirely on your device. Nothing is sent to any server.