Archived App (Last seen on 15 May 2026)
This is an archived listing of the app previously available on the App Store.Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.
About
This app estimates critical speed—your baseline running capacity—using time and distance data from at least three sessions. It helps runners train smarter, not harder.
What's New in Attention Bubble
1.1
December 1, 2025
An introductory splash video has been included to provide users with a clearer understanding of the app’s purpose and features.