One install. 7 detectors. Every wasted dollar, found. Most API dashboards show you what you spent - not why. Costly is an open-source SDK that wraps your AI client, logs every call with zero latency, and runs 7 automated waste detectors: prompt bloat, model overkill, duplicate queries, error waste, and more. Setup with 1 command: npx costly init. Starting with Anthropic, more providers coming soon.

Framer — Launch websites with enterprise needs at startup speeds.

Launch websites with enterprise needs at startup speeds.

Hey PH! I'm Danny, the builder behind Costly. I realized I spent $97 last month on Anthropic API calls and had no idea where it was going. The dashboard showed me the total and a chart - but not which features caused the spike, how much of that was duplicate prompts, or if I was running expensive models on tasks a cheaper one would handle fine. So I built Costly. It's an open-source TypeScript SDK that wraps your Anthropic client in two lines of code, logs every call asynchronously (zero added latency), and runs 7 waste detectors automatically. Setup is one command: npx costly init What makes it different: most monitoring tools show you dashboards. Costly actually tells you what's wrong and how to fix it - prompt bloat, model overkill, duplicate queries, runaway features, error waste, output over-generation, and cost trajectory warnings. Starting with Anthropic, OpenAI support is next. Would love your feedback - what would make this useful for your stack?

Framer — Launch websites with enterprise needs at startup speeds.

Launch websites with enterprise needs at startup speeds.

Costly

Your AI is Costly. Let's fix that.

Your AI is Costly. Let's fix that.