BotCost.dev: A Free Browser-Based Tool to Detect and Block AI Bot Traffic on Your Website
By
plaintosapp
The kind of bagel you'd toss to the pigeons.
Summary
BotCost.dev is a free browser-based tool that analyzes server log files (Nginx, Apache, Cloudflare, Vercel) to identify requests from 19 known AI bot crawlers (GPTBot, ClaudeBot, Bytespider, CCBot, etc.). It calculates the bandwidth cost in dollars and generates ready-to-paste WAF rules to block unwanted AI bot traffic. All processing happens locally in the browser with no data uploaded.
Key quotes
· 3 pulledDrop your log file — Drag and drop your Nginx, Apache, Cloudflare, or Vercel log file. Everything stays in your browser — nothing is uploaded.
We match every request against 19 known AI bot fingerprints and calculate the real bandwidth cost in dollars.
Generate a ready-to-paste WAF rule
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