GlassWire unfortunately does not count data usage of apps it cannot identify which includes stuff like work folders, samsung's "Secure Folder" thing and many other similar features. That unfortunately makes the data shown quite misleading. While the app, Traffic Light, cannot link that info to specific apps either, imo it's important to be transparent and still show that that data has been used.

Also, the app has a bunch of other features such as a persistent network speed (live-)notification, extensive data plan tracking and widgets.

F-Droid: https://f-droid.org/en/packages/com.leekleak.trafficlight/

Github: https://github.com/leekleak/traffic-light

Play Store: https://play.google.com/store/apps/details?id=com.leekleak.trafficlight

Actually, the title is a bit of a lie, as that was not the core intention of making the project, but I've made previous posts attacking Internet Speed Meter and the app does much more :D

GitHub: https://github.com/leekleak/traffic-light

Play: https://play.google.com/store/apps/details?id=com.leekleak.trafficlight

F-Droid: https://f-droid.org/en/packages/com.leekleak.trafficlight/

Traffic Light is an open-source tool for tracking your network usage while ensuring total privacy. Inspired by Internet Speed Meter and GlassWire.

Features

• Data plan tracking (including multiple SIMs)
• Beautiful widgets
• Status bar network indicator
• In-depth historical data tracking
• At a glance usage analytics
• Uses less battery than alternatives
• Fast and modern with a stunning design