uMobix is a competent Android monitoring app and a mediocre iPhone one, priced in the middle of the market. Buy it for an Android phone you can hold for ten minutes; do not buy it expecting iPhone WhatsApp, because that needs a jailbreak and the vendor says so only in the fine print.
Strengths, from use rather than marketing: fast dashboard, reliable SMS and call logs, social-app capture on Android that includes Snapchat and TikTok notifications, a keylogger that works on unrooted Android in many builds, and location with a decent history view. Installation is straightforward and the licence is per device.
Weaknesses: iPhone coverage is backup-based and laggy; the refund window is short and support can be slow to honour it; there is no free trial despite what affiliate sites say; and the screen recorder is an extra purchase, not part of the base plan.
Legal reality, which applies to all of these: monitoring an adult's phone without consent is a criminal offence in the EU and most US states. A parent monitoring a minor in their care is the one relationship where this is normally lawful, and even then, disclosure is what keeps it defensible if it ever comes up.
Where our app fits. Ultimate Phone Spy runs on Android 4.0+, Windows and macOS (supported devices) and covers messages, calls, social notifications, app usage and location in one dashboard. Compare on Android capability; on iOS, both products are constrained the same way, and Screen Time is free.