Canopy is a legitimate parental-control product — it's an AI-based content filter that screens web pages in real time and works across iPhone, Android, Windows and Mac — so the question isn't whether it's a scam but whether its filtering-first approach is what your family actually needs. Real-world feedback on Canopy is genuinely mixed: parents who mainly want inappropriate content blocked tend to like it, while users who expect detailed activity reporting or location history often find its dashboards thin for the yearly price. Evaluate it against the specific problem you're solving rather than generic reviews.
For context on the alternative you mentioned: Ultimate Phone Spy takes the opposite approach — it's a full monitoring dashboard rather than a filter, covering Android, Windows and Mac (not iPhone, since iOS doesn't permit that kind of device-level access; anyone claiming stealth iOS monitoring is selling something that doesn't work). You can compare exactly what you get on the features page and the pricing page — $69.90/month, about $40/month quarterly, and $16/month on the annual plan — before spending anything.
A practical middle path: start with the free first-party options — Google Family Link (Android), Apple Screen Time (iOS/Mac) — both give content filters, app limits and location for $0, and Family Link's free filtering may solve your problem entirely. If your child keeps needing filters bypassed or you need web history outside the built-in dashboard, that's the gap a paid tool fills. Also note honest coverage limits: no monitor can read iMessage on iPhone. Whichever you pick, tell your child the device is supervised — disclosed oversight is both more effective and the only defensible use.