The Grayscale toggle now also desaturates Google Photorealistic 3D Tiles in the 3D site view. Every streamed tile switches instantly when you toggle, and switches back just as fast - no re-download. The crowd and zone colours stay untouched, so a grey basemap makes the people and density read even more clearly.
This completes grayscale coverage across the app: 2D basemaps (OSM, Esri, Google), the 3D tile floor, and Google 3D tiles.
Includes everything from v2.1.0 (multi-point density gradients) and the v2.0.x fixes.
Download crowd-count.html below for the offline single-file app - save it anywhere and double-click it. Map tiles, place search, Google features, and the animated density references need an internet connection; everything else works offline.