Base Rates

Base Rates is a web-based learning tool that helps developers internalize essential performance metrics and cost estimates through spaced repetition. It covers CPU latencies, network round-trip times, throughput, storage costs, and other numbers that systems thinkers use for quick calculations. The app organizes content into eight decks covering units, cache operations, latency, networking, throughput, compute costs, data operations, and compression ratios.

The trainer automatically saves your progress without requiring authentication. The maker used Claude to help generate the initial logic and content structure, then spent significant effort verifying the accuracy of each metric against real-world data.