There are a couple of Libre apps with similar names.
The one I linked to earlier, Freestyle LibreLink app, was the one which scans your sensor to collect the reading. There are minimum system requirements of the mobile phone required to use this app. Most importantly NFC (Near field communication) compatibility.
More information and list of phones can be found here.
https://freestyleserver.com/Payloads/IFU/2019/q2/ART39109-001_rev-F-Web.pdf
There is also the LibreLinkUp which is for family and caregivers, so they can receive the readings when the patient has scanned the sensor with the LibreLink app.
https://www.freestylelibre.co.uk/libre/products/mobile-app-librelinkup.html
Then the company also has a cloud based storage system, LibreView, which store your data and you can share with medical professionals etc.