How to handle crash monitoring, analytics, update prompts, and review requests for an iOS app without sending user data to external services — using only Apple-native tools and open-source libraries. Based on real-world experience with an App Store-published app.
A development log for "IIIF AR," an iOS app that places high-resolution IIIF Image API images at real-world scale on detected floor surfaces using ARKit, dynamically loading tiles as the camera approaches.
Investigation and fixes for a 6.7% crash rate in KotenOCR, an iOS OCR app using ONNX Runtime with 6 models totaling ~230MB on disk.
KotenOCR v1.3.0 adds NDLOCR-Lite support for modern printed text OCR alongside the existing classical text (kuzushiji) mode, with one-tap mode switching and parallelized recognition for up to 6.7x speedup.
Using withThrowingTaskGroup to parallelize OCR recognition in an iOS app, achieving 1.4x to 6.7x speedup depending on the number of detected text regions.
KotenOCR is a free iOS app that runs the NDL Koten OCR-Lite model entirely on-device, enabling offline recognition of kuzushiji (classical Japanese cursive script) from photos.