The reason Spyic’s reviews are all over the place comes down to one thing: iOS compatibility drift. Apple updates its OS roughly annually and every major update can break apps that rely on certain system permissions. If a monitoring app company doesn’t push patches within a reasonable window, their iOS product basically stops working but the reviews from before the break still show up in search results looking positive.
On Android, the situation is a bit more forgiving because the permission model is more open, so apps tend to stay functional longer between updates.
When comparing Spyic alternatives, the question to ask isn’t “which has the best feature list” it’s which company is actively maintaining their app right now. Check the changelog in the app store. That tells you more than any review. Xnspy show recent update activity, which is a solid starting point. 