I built a free API cost calculator after a $340 surprise invoice

Show HN: I built a free API cost calculator after a $340 surprise invoice

I built a free API cost calculator after a $340 surprise invoice is a company in show hn launch.

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I was building a small LLM-powered side project and forgot to account for my system prompt tokens. 800 tokens × 2,000 requests/day × input token rate = $340 invoice I wasn't expecting.Built APICalculators to avoid doing this math in spreadsheets every time. It now covers 16 calculators: LLM APIs (GPT-4o, Claude, Gemini), vector databases (Pinecone, Qdrant, Supabase), serverless (Lambda, Cloudflare Workers), auth providers (Clerk, Auth0), payment processors (Stripe vs Paddle), and cloud VPS comparison.Everything runs in the browser — no signup, no data sent anywhere.Would love feedback on what's missing or wrong.

Within the show hn launch space, the company focuses on its core offering rather than a broad product line.

Directory data places it at the Show HN launch stage.

Website: apicalculators.com