Tap a field and watch a growing season unfold. Epic Fields, by Wildeye / u/Casual_Maker, turns Sentinel-2 observations into shareable movies coloured by NDVI, a measure of vegetation greenness. Frames between clear satellite passes are interpolated, so the smooth playback isn't continuous photography.

The maker used Claude Code and Copilot to help build the native iPhone app, a Rust backend, field-boundary detection and tests to check changes to that detection. Boundaries still work better for some crops than others.

Free on iPhone, iOS 18+, with no signup. A shared season is viewable in a browser:
epicfields.app/s/FSIpzLlUZ4rxQTmbQcHBbA

App and explanation:
epicfields.app/