About this app
This app measures the quality of used tennis balls by comparing the bounce height of a used ball to that of a new ball. One-Time In-App Purchase – $3.99: Unlock unlimited lifetime access to bounce height comparisons.
Latest release
What’s New
Version 1.0.4
Aug 7, 2026
Bug Fixes
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
Free
Historical low
Free
Paid → free
0×
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 23, 2026 · 5:37 AM Free
Screenshots
