Data Monitor: Simple Net-Meter

This app has a nice array of features and is easy to use. However, it's mobile data usage value is at least 10% greater than a similar app & reporting from my mobile service provider. I am less likely to overrun my monthly allotment than if the app under reported my usage but I would rather have a maximum error of 2% or less. I paid to unlock the widgets but they have the same error. There isn't any contact for support & the provided website has no content.

Samsung S8+ with Android 8. Paid version. But free version did everything I wanted. This app has a clean design which makes it easy to use and quickly get the data usage info I want. I mainly wanted an app that upon opening displays the status of my current data plan. Both the free and paid versions did that. Five stars for a solid, efficient design. I paid happily to remove the ads.

Initially, there are two in-app purchases - one for $3.00 for premium features, and one for $1.30 to remove the ads. That's bad enough. (One reasonable charge should cover both.) Then, after you pay those, you still get a "Store" button where the developer nags you for yet another $1.30 "donation." Worse, under Settings, he advertises even more apps! Once we pay, ALL ads should go away.