whereismyai
Free Developer Tool
Free Developer Tool is a web-based developer tool that calculates token counts and estimates LLM API costs.
TokenCost.ai is a free browser-based developer tool that calculates accurate token counts and estimates real-time API costs across OpenAI, Anthropic Claude, Google Gemini, and DeepSeek models. Developers and product teams can upload documents, estimate context usage, and plan batch costs. The platform features a production multi-run batch estimator to project total operational costs at scale and a side-by-side model comparison matrix for flagship and lightweight LLMs. All token calculation, document parsing, and file handling happen one hundred percent locally in the web browser, ensuring prompt content and files never leave the device. Pricing estimates are calculated based on publicly available provider rate cards.
Free Developer Tool at a glance
- Best for: Software engineer, Product manager
- Runs on: Web
- Pricing: Free
- Released: November 2026
- Category: AI productivity tool
- Website: ai-token-estimator.pages.dev
Key features
- Calculate accurate token counts
- Estimate real-time API costs
- Upload and parse documents locally
- Estimate context window usage
- Project multi-run batch costs at scale
- Compare models side by side
Use it for
- Calculate token counts for prompts
- Estimate API costs before deployment
- Compare token metrics across LLMs
- Plan batch deployment operational costs
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