Here’s my take on this.
It’s not uncommon for monitoring apps to have hiccups with new Android versions, as manufacturers like Samsung add their own security layers. When looking for alternatives, there’s always a trade-off to consider.
On one hand, you have well-established apps like mSpy. They are known for being feature-rich and generally reliable, but they can be on the pricier side. On the other hand, newer apps like uMobix are often praised for their user-friendly interfaces and strong performance on recent Android versions.
Since you’re here, it might also be worth comparing these with Haqerra’s own offerings. The key is to check their official compatibility lists specifically for Android 13 on a Samsung S21 before committing. Each will have its own balance of features, reliability, and cost.