HikariYomi (光読み) is a native iOS AR optical ephemeris & field planner for photographers. Unlike scouting tools that push subscriptions and fail off-grid, HikariYomi runs 100% offline via on-device astronomical algorithms. Highlights: • Live AR celestial arcs & golden hour countdowns • Prime lens FOV simulator (24mm–135mm) with 3:2 frames • Map shadow projections & 16-day sunset scores • Milky Way core tracking + NPF shutter limits • Free core tools, one-time $7.99 Pro buyout