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Discover tools from different categories to expand your toolkit beyond Math.
Regular Polygon Calculator
Calculate properties of regular polygons including area, perimeter, and angles
Math
Rate Limiter Simulator
Simulate API rate limiting with configurable request limits and time windows. Test 429 responses.
Developer World
Loan Calculator
Calculate monthly payments and total interest for any type of loan
Financial
Blacklist Checker
Check if an IP address is listed on any spam or security blacklists with our free online blacklist checker tool. Verify your email server's reputation.
Network