Clack Lab is a mechanical keyboard sound analyzer for enthusiasts who want to measure, compare, and improve their builds. Record a repeatable typing test with your iPhone microphone, then compare thock, clack, resonance, decay, and consistency before and after mods. Use the microphone to measure keystroke sound, score the thock, and compare keyboard builds before and after mods like foam, tape, switch changes, lubrication, and O-rings. Features: - Live keyboard sound analysis from the iPhone microphone - Per-session Thock, Clarity, and Consistency scores - Character classification for thocky, marbly, clacky, and clicky builds - Frequency centroid, decay time, level, and high-frequency ratio metrics - Saved sessions for keyboards, switches, and build notes - Side-by-side comparison tools with Clack Lab Pro Clack Lab is designed for hobbyist keyboard tuning and comparison. Results depend on room noise, phone placement, keyboard position, and typing consistency.