About this app
This app is a fully offline Mandarin tone sandhi practice card tool. It does not require login or network access and does not collect user data. All practice records are stored locally on the user's device.
Latest release
What’s New
Version 1.1
Jul 29, 2026
Added a feedback feature.
Audience growth
Ratings growth
7-day gain
+0
Ratings / day
0.0
30-day gain
+0
Baseline captured. Growth appears after the crawler observes a changed rating count.
Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.
Price tracking
Price intelligence
Current
$0.29
Historical low
USD 0.29
Paid → free
0×
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 15, 2026 · 1:42 PM $0.29
Screenshots
