Devices that still work when the internet doesn't.

Health & Personal Care / pulse oximeter

iHealth Labs iHealth Air Pulse Oximeter (PO3)

D2 Cloud-Optional — Full function with the router off.

The unplug test

Turn it on, clip it to a finger, and the number appears on the device's own LED screen within seconds — no phone required at all. What the Bluetooth link and the MyVitals app add is a continuous history, a plethysmograph waveform, and a perfusion index; without them you still get the same SpO2 and pulse-rate reading the device exists to produce, you just do not get a log of past readings, since the device does not appear to keep one on its own.

Why this tier: The manufacturer's own product page states the device has its own LED screen that displays the SpO2 and pulse-rate reading directly, and that the free iHealth MyVitals app (backed by iHealth Cloud) is something you 'can' pair for extra history and waveform visualization, not something setup requires. Core function (taking and displaying a reading) works with the device never paired to anything, and the vendor's cloud is a named, optional add-on, which is the D2 row on the decision table.

Specifications

Account requiredapp only
Works offlinefully
Lost when offlinetrend history and logging of past readings over time, in-app plethysmograph waveform and perfusion-index visualization, iHealth Cloud sync and any sharing features tied to the MyVitals app
Forced firmware updatesunknown
Radiosble
FCC IDno intentional-radiator grant found
Local controlble
Phones homenone
Self-hostable none — no self-hosted replacement exists
No self-hosted or third-party replacement for iHealth Cloud/MyVitals was found. The device's own LED display is the only local output; there is no on-device history to fall back on beyond the current reading.
Parts availableunknown
Availabilityin stock
Price band$35-45 (seen 2026-09-03)
Vendor risk 0 / 3

Where to buy

Open questions

Sources

Class A is primary (manual, FCC filing, teardown). Class B is corroborated community reporting. Class C is never sufficient alone.

History

Last verified 2026-09-03 — 3 days ago.