Looking into screenless fitness tracker app compatibility before you buy? It’s the right question to ask — a screenless band is only as good as the app it syncs to, since every reading, chart and alert lives there instead of on a wrist display. Here’s exactly which REXQU screenless bands pair with which phones, and what you need to know before you unbox one.
Why Screenless Fitness Tracker App Compatibility Matters
With no on-band screen, the app isn’t optional — it’s the entire interface. Heart rate, blood pressure, blood oxygen, sleep stages and daily activity all get pushed from the band to your phone over Bluetooth, then rendered as dashboards in the app. If the app doesn’t support your phone’s operating system version, the band effectively can’t be used, so checking compatibility is worth doing before you buy rather than after.
REXQU GuardBand, PulseBand & CardioBand: What They Require
Three of REXQU’s screenless bands — the GuardBand, PulseBand and CardioBand — all pair with the same free G BAND app, and all three officially support Android 8.0 and up, plus iOS 13.0 and up. That covers the overwhelming majority of phones sold in the last several years, but it’s worth a quick check if you’re still running an older iPhone or a budget Android device with an outdated OS.
The PulseBand specifically pairs over Bluetooth 5.3, which gives it a steadier connection and lower power draw during continuous heart-rate and HRV syncing compared to older Bluetooth versions. The GuardBand and CardioBand connect over Bluetooth as well, syncing GPS location, SOS alerts, and blood pressure/SpO₂ readings back to the same G BAND dashboard.
| Model | App | Android | iOS | Bluetooth |
|---|---|---|---|---|
| GuardBand | G BAND | 8.0+ | 13.0+ | BLE |
| PulseBand | G BAND | 8.0+ | 13.0+ | 5.3 |
| CardioBand | G BAND | 8.0+ | 13.0+ | BLE |
| AeroBand | Companion app | Yes | Yes | BLE |
What About the AeroBand?
The AeroBand uses its own free companion app rather than G BAND, but works the same way in practice: everything — 24-hour heart rate, blood pressure, blood oxygen, sleep and activity — syncs over Bluetooth to clear dashboards on both Android and iOS. Screenless fitness tracker app compatibility here follows the same pattern as the rest of REXQU’s band lineup: pair once, and the app becomes the only place you’ll ever check your data.
Setting Up Pairing the First Time
Pairing takes a few minutes: install the app, create a free account, enable Bluetooth on your phone, and follow the in-app prompt to find and connect your band. No subscription is required for any of these bands — the app and its core tracking features are free. If your phone falls just short of the minimum OS version, most manufacturers still let you update to a newer version of Android or iOS from your device settings before you try pairing again.
Common Questions
Can two people share one band’s app account? Each account is meant for one wearer, since sleep, heart-rate and activity baselines are personalized — a household with multiple wearers should use separate accounts, one per band.
Does the band need to stay near my phone to keep tracking? No. The band stores a rolling window of data on-device and syncs it to the app the next time your phone is nearby with Bluetooth on, so short trips away from your phone won’t lose readings.
What happens if I switch phones? Reinstall the app on the new phone, sign back into the same account, and re-pair the band over Bluetooth — your historical data stays tied to your account, not to a specific handset.
Non-Medical Use Disclaimer
These bands are wellness devices, not medical equipment. Heart rate, blood pressure and blood oxygen readings are meant for everyday awareness and trend-spotting, not diagnosis — talk to a physician about any reading that concerns you.
The Bottom Line
If you’re checking screenless fitness tracker app compatibility before ordering, the short version is: any phone running Android 8.0+ or iOS 13.0+ will work with REXQU’s GuardBand, PulseBand and CardioBand through the G BAND app, and the AeroBand pairs just as easily through its own companion app. Browse the full screenless fitness tracker collection to compare features side by side. For more on how Bluetooth wearables maintain a low-power connection to your phone, see Wikipedia’s overview of Bluetooth Low Energy.