Three seconds to calibrate
Keep your forearm level while the app finds a neutral position before counting relative angle.
Wrist TrainerWrist Trainer
Clear records for
every wrist session.
Hold your phone sideways, calibrate a neutral position, and count extension and flexion with calm, immediate feedback.
On-device processing · raw sensor samples never uploaded · no login for core training
Focus on the session
Less tapping,
clearer feedback.
From setup and calibration to saving, every step is designed to make the next action obvious.
Training stays on-device
Raw accelerometer and gyroscope samples are processed in memory during training, not sent to the cloud.
Two directions, one record
Extension and flexion are counted separately, then saved as a local session summary you can revisit.
From start to save
A session you can understand.
A simple entry point, a clear target, and safe stop conditions keep every screen focused on training.
From training to consistency
Keep each movement
in your own rhythm.
Offline training is the default. Accounts and membership are optional, with a clear boundary around what needs a sign-in.
Offline core
Finish a session without a network
Calibration, counting, feedback, saving, and basic history do not depend on an account or connection.
Motion logic
See both directions clearly
Extension and flexion have separate counts and a neutral return rule to avoid threshold jitter.
Account boundary
Sign in and membership are separate
Core training never waits for a login. Sign-in establishes identity; purchases and entitlements are verified separately.
Interface
Language and theme choices
Chinese and English, light and dark themes, plus system appearance in a fixed portrait interface.
Three steps
Position the phone and start.
No wearable and no repeated screen controls during the movement.
- 1
Hold the phone sideways
Screen facing down, forearm level, with the phone and wrist moving in the same plane.
- 2
Stay still for three seconds
Calibration confirms a stable position; fast movement or an off-axis pose restarts the progress.
- 3
Move slowly and save
Reach the target, return to neutral to unlock the next count, then save the session summary when you finish.
This estimates phone posture, not a clinical joint angle. Stop and seek professional advice if you feel pain, numbness, swelling, or discomfort.
Before you start
A few useful answers.
Grip, counting, privacy, and account boundaries in plain language.
How should I hold the phone?
Hold it sideways with the screen facing down and your forearm level for three seconds. The interface stays portrait while you train.
Is training data uploaded?
Raw accelerometer and gyroscope samples are processed in device memory and are not saved or uploaded. Session summaries and settings stay local. Read the privacy policy.
How does it avoid duplicate counts?
After extension or flexion reaches the target, the phone must return to the neutral zone before the next count unlocks. Threshold jitter does not keep adding reps.
Do I need an account to train?
No. Core training, settings, history, and local deletion work without an account or network. Accounts are for identity, membership ownership, and purchase recovery.
Is this a medical measurement tool?
No. Wrist Trainer is not a medical device and does not diagnose, treat, or judge recovery. Its angle is a phone-posture estimate, not a clinical joint measurement.
How can I contact support?
For privacy, product, or usage questions, email mhgd3250905@gmail.com.