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What is burn0?

burn0 is a lightweight cost observability tool for developers. Add one import to your app and instantly see what every API call costs — LLMs, SaaS APIs, and infrastructure.

Quick Start

Get up and running in 2 minutes

50+ Services

OpenAI, Stripe, Twilio, Supabase, and more

CLI Tools

Terminal-first cost tracking

Dashboard

Visual cost breakdown in the browser

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How it works

Add one line to your app’s entry file:
That’s it. burn0 automatically:
  1. Intercepts every outbound HTTP/fetch call
  2. Identifies which service it’s calling (OpenAI, Stripe, Twilio, etc.)
  3. Calculates the cost based on the provider’s pricing
  4. Shows costs in real-time in your terminal

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Two modes

Everything stays on your machine. Costs shown in terminal and stored in .burn0/costs.jsonl. No network calls to burn0.dev.

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What it tracks

burn0 supports 50+ services across three categories:

See all 50+ supported services →