Market Mood doesn't have user accounts. There's nothing to log in to and nothing to upload. The app shows public market sentiment indices — Crypto Fear & Greed, VIX, BTC dominance — and all the personalisation (alert thresholds, watchlist preferences) lives on your device.
What we fetch over the network. The app makes calls to the public data feeds it needs to render the indices. Those calls are made directly from your device to the public providers; the request includes only what the public API requires (generally none of your information). The app makes no analytics calls, no telemetry calls, and no calls to any server I run.
Local storage. Your alert thresholds, complication choices, and the indices you've pinned are saved on the device. iCloud sync is optional and uses Apple's CloudKit private database; if enabled, those preferences sync between your own devices and only your devices.
Notifications. Threshold alerts are scheduled locally on the device. There's no push server. The app evaluates the latest reading against your thresholds and posts the notification through iOS — same mechanism as any local reminder.
No tracking. No analytics SDKs, no advertising frameworks, no fingerprinting, no third-party trackers. The app is built with Apple frameworks plus the data-feed clients and nothing else.
If you want to dig into any of this, email chen.he@icloud.com.