Every iOS light meter app I tried treated all film the same: one ISO, one reciprocity curve, no roll context. F8t is different. Per-stock reciprocity for 30+ films, multi-spot Zone System, leaf shutter flash sync per camera, shot log with GPS and EXIF info card auto-saved to your camera roll, MF film back tracking, sun widget. 800+ cameras and films in the gear DB. SwiftUI, no backend, no account, all data on-device. One-time purchase EUR 14.99, no subscription, ever.