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Make sure your face is visible to the front camera and you're looking at something at least 20 feet (6 m) away — not the screen. If you use multiple monitors, re-run calibration in Settings so Blink knows where your screens are.
No. During sessions the camera samples about 5 seconds per minute and only tracks continuously in the 90 seconds before a break is due.
Open Blink → Settings → paywall → "Restore purchases". Make sure you're signed into the same Apple Account that bought it.
Blink needs an iPhone with a TrueDepth (Face ID) camera running iOS 26 or later.