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Observe measures how fast your Expo app starts and how fast each screen becomes usable, on real user devices. Install the library, wrap your root layout, and startup metrics arrive with nothing to instrument. Every native build and every EAS Update gets its own marker on the chart, so you can see which release moved the line. Full device context on every session: model, OS, country, network type, thermal state, frame data. Free plan covers 100K events a month.