The AMBOSS Knowledge USMLE and the AMBOSS Qbank app together offer a complete and streamlined study resource for your Clerkships, NBME Subject Board (Shelf) Exams, and the USMLE Step 1 and Step 2 CK & CS. It can also be used as a supplementary resource for the USMLE Step 3 exam. Both apps are free with a subscription to AMBOSS. No Wi-Fi? No problem.
Download the free .apk file of AMBOSS Knowledge USMLE 18.104.22.1688 and have a look at users' reviews on Droid Informer. This installation package takes up 6 MB of disk space. The antivirus report has confirmed that the app is totally safe for usage. AMBOSS is the official developer of this application that can be found in the Medical tools category.