About this app
Columbia library users with borrowing privileges can check out books in Butler Library using the device app. More library locations will be added soon.
Latest release
What’s New
To make our app better for you, we bring updates to the App Store regularly. This update also includes minor usability improvements and bug fixes.
Audience growth
Ratings growth
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
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 12, 2026 · 6:31 AM Free
Screenshots
