From skeptic to convert: how Fieldy adopted Expo for their AI wearable

2026-03-27

Fieldy (an AI wearable app relying heavily on BLE and background audio) was skeptical of Expo adding overhead, but migrated and cut app size by 25%. The gains came from Expo Atlas-guided bundle cleanup (removing bloated date/calendar libs, fixing lodash tree shaking, and deleting an 18MB bundled SF Pro font), replacing XHR/blob hacks, and fully automating deployments with EAS Workflows.