TokenLens is a VS Code extension that shows your OpenAI, Anthropic, Gemini and Mistral API costs in real time. It runs a local proxy on your machine. Point your SDK at it with one env var and every API call shows its cost in your status bar as it happens. No code changes needed. Nothing leaves your machine on the free plan. Free tier includes unlimited tracking and 7 day history. Pro is £19/mo for unlimited history, CSV export and cloud backup.
