Keyboard Heatmap Lab

Keyboard Heatmap Lab is a local-first Android tool for analyzing text against physical keyboard layouts. See where typing effort concentrates, compare layouts, and tune your own layout designs — all offline on your device.

Key features:
• Create and manage analysis projects with search, sort, duplicate and undo
• Built-in QWERTY, Dvorak and Colemak layouts
• Create and edit custom keyboard layouts
• Live character frequency, bigrams, hand alternation, hand balance and finger-load metrics
• Compare two layouts against the same source text
• Interactive zoomable heatmap canvas with pinch and pan
• Draft autosave and recovery after app restart
• Light, dark and system themes
• JSON backup import/export via Storage Access Framework

Privacy-friendly by design: no account, no ads, no internet permission, and no analytics SDKs. Your projects and custom layouts stay on the device unless you export a backup.