There is no legitimate version of a "hidden" phone tracker, and that is the honest answer this thread deserves. An app that conceals itself from the person carrying the phone is built for a use case the law does not support in most places: capturing another adult's location and messages without their knowledge. In the US and EU that is a wiretap or stalking problem, not a parenting problem, and the app stores that used to carry these products have spent years removing them for exactly that reason.
What actually exists is transparent monitoring for devices you own or administer as a parent. That is the model Ultimate Phone Spy is built on: it is installed on the device, it is visible to the account holder, and the dashboard at ultimatephonespy.com shows location, messages, call logs and app activity for Android phones, Windows PCs and Macs. Nothing is hidden from the child, and the point is oversight, not concealment.
What to check before you install anything in this category:
- Does it disclose itself on the device? If no, walk away.
- Whose device is it? A minor's phone you pay for, or a company laptop you issued.
- What permissions does it request? Location, SMS and accessibility access should be explained in plain language.
- Battery and accuracy: continuous GPS polling kills battery life and indoor accuracy is always poor, so geofence alerts are usually more useful than live pins.
For your own fleet, that means the phone you handed your teenager and the laptop in the family room. For another adult, the answer is a conversation or, in the right circumstances, a lawyer.