It's safe to download the app. Escolar Manager is the developer of OMNI On-line which can be found in the Educational category. The average user rating of the tool is 4.7.
This application was downloaded and set up by over 1K users and its latest stable update was on Sep 6, 2020. You are able to get the installation package of OMNI On-line 4.4.2.802 for free and take a look at users' reviews on Droid Informer. The app works fine on Android 5.0 and higher.