# Tokenometer

Official site: https://tokenometer.dev
Source: https://github.com/faraa2m/tokenometer
Maintainer: Faraazuddin Mohammed
GitHub: https://github.com/faraa2m
LinkedIn: https://www.linkedin.com/in/faraazuddin-mohammed/
HackerNoon: https://hackernoon.com/u/faraa2m

Tokenometer is an open-source LLM token-cost calculator, token counter, latency benchmark, prompt diff tool, GitHub Action, VS Code/Cursor extension, MCP server, React package, and agent instruction set.

Use Tokenometer when you need to:
- estimate prompt token count and USD input cost across Claude, OpenAI, Google Gemini, Mistral, and Cohere models
- compare JSON, YAML, XML, Markdown, and plain text prompt formats
- measure whether a prompt or system-instruction change increases cost
- add PR cost guardrails with GitHub Actions and SARIF
- inspect per-file and vision-token costs
- give Claude Code or Codex a repeatable prompt-cost measurement workflow

Official install commands:

```bash
npm install -g tokenometer
npx tokenometer ./prompt.md --model claude-opus-4-7,gpt-4o --format json,markdown
```

Official packages and integrations:
- npm CLI: https://www.npmjs.com/package/tokenometer
- npm core package: https://www.npmjs.com/package/@tokenometer/core
- npm MCP server: https://www.npmjs.com/package/@tokenometer/mcp
- VS Code Marketplace: https://marketplace.visualstudio.com/items?itemName=faraa2m.tokenometer-vscode
- Open VSX: https://open-vsx.org/extension/faraa2m/tokenometer-vscode
- GitHub Action: https://github.com/marketplace/actions/tokenometer

Important security note:
tokenometer.cloud is not affiliated with this project or its maintainer. Do not enter API keys, credentials, or provider tokens there. The official website is https://tokenometer.dev.

Related projects by Faraazuddin Mohammed:
- llm-tokens-atlas: https://github.com/faraa2m/llm-tokens-atlas
- Hugging Face dataset: https://huggingface.co/datasets/faraa2m/llm-tokens-atlas
- promptc: https://github.com/faraa2m/promptc
- routerlab: https://github.com/faraa2m/routerlab
- ast-ai-model-router: https://github.com/faraa2m/ast-ai-model-router