HOSFU BLOG · APP SUPPORT
HOSFU App FAQs & Troubleshooting
The HOSFU app is free to download and use. No app subscription is required.
Do these trainers need an app?
Gen 1 and Gen 2 work without an app. Gen 3 is controlled through the HOSFU app. Gen 4 supports the app and on-device controls.
What does real-time training feedback mean?
Gen 3 and Gen 4 provide real-time training feedback in the HOSFU app. Product feedback does not diagnose a condition or replace professional assessment of technique.
Is the HOSFU app free?
The HOSFU app is free to download and use. No app subscription is required.
Before your first Gen 4 app session
Connected, but not sure what to do next?
Connect before sitting down: enable Bluetooth, power on Gen 4 and open the HOSFU app. The indicator turns blue when connected. Then sit as instructed, choose a program and complete its Calibrate or Reset prompts. The connection and calibration are separate steps; do both before following the exercise cues.
The curve looks different after you move?
Your posture and the air cushion affect the pressure signal. Return to the instructed position and recalibrate if you change your seating position or cushion inflation, or if the curve looks abnormal. Do not press with your thighs or shift your body to make a higher reading. The graph is feedback from the device, not a clinical strength measurement.
Why is Quick Comfort not an app workout?
Quick Comfort is the separate three-minute vibration-and-warmth mode and does not record active training. To move to Smart Training, switch Gen 4 off, turn it on again and connect the app. In Smart Training, the 15-minute inactivity shutdown is an idle timeout, not an instruction to exercise for 15 minutes.