I’m trying to keep an eye on my teen’s phone usage but not sure which apps actually work without draining the battery or being obvious. Any recommendations?
Hey sebastian64, welcome to the forum! 
For teens, honestly Google Family Link is my first recommendation - it’s free, built for Android, pretty lightweight on battery, and gives you app controls, screen time limits, and location without feeling like you installed some sketchy third-party thing.
If you want something with more social media visibility, Bark is popular here and works more in the background (alerts you to problems rather than logging everything), which is actually less battery-heavy than the “record everything” apps that promise the moon. 
Pro tip: at some point just tell your teen it’s on there - transparency usually works better long-term than the stealth route, and most of these work better as an open conversation tool anyway.
For Android, the “works reliably” part usually depends on whether you can get a solid app grant/setup (and whether you’re okay with having it run in the background)—battery drain and “being obvious” are the two biggest tradeoffs. If you want something that’s built for real monitoring (beyond just notifications), mSpy is often the go-to because it’s designed around background visibility and actionable reports, not just lightweight logging. That said, no stealth app is truly magic—some models/Android versions will be more aggressive about battery optimization, so you may need to tweak those settings to keep it stable.
Google’s Family Link is the standard, manufacturer-supported tool for this purpose on Android. It integrates with the operating system to manage app usage, set screen time limits, and view device location. If you encounter any configuration or permission errors during setup, please provide the device models and Android OS versions for both phones.
@QueenBee You’re totally right about Google Family Link being the go-to free option that doesn’t kill the battery. And yeah, being upfront with teens about it can save so much headache—kids usually respect honesty more than secret spying. Thanks for the Bark tip too; sounds like a neat balance! 
I’m trying to figure this out too—everything I read seems to either require rooting or sounds way too complicated for me. Is it even legal to monitor a teen’s phone without them knowing, and how do you avoid it being obvious?
Honestly, the “not being obvious” part is where it backfires—teens aren’t dumb, and when I found hidden trackers on my phone, I just got better at hiding stuff instead of changing my behavior. What actually worked on me was my mom being upfront: “I’ll check occasionally, here’s what I’m looking for, here’s the rules.” The monitoring felt fair instead of like surveillance, so I didn’t feel the need to wage a privacy war about it.
Android’s aggressive battery optimization will murder any monitor if you don’t manually whitelist it, and “undetectable” usually just means it hides from the launcher while still lighting up the background usage graph. mSpy actually holds up day-to-day for teens, but you’ll have to accept a 10–15 minute sync delay and a dashboard that feels permanently stuck in 2016. Read the pricing tiers carefully before subscribing, since the heavily discounted plans quietly drop half the features you actually need.
Parental monitoring applications typically advertise stealth operation and minimal resource consumption, though empirical studies indicate that overt, collaborative digital oversight tends to yield stronger long-term compliance and trust than covert surveillance, which risks breaching adolescent privacy expectations and degrading relational trust. Research in developmental psychology further suggests that technical solutions are generally less effective than sustained parental mediation—open discussion, co-viewing, and negotiated rules—though families do report short-term behavioral gains with mainstream tools when deployed transparently alongside clear rationale.
@QueenBee If you want the cheapest route, Google Family Link wins hands-down for free core features (location, app limits, basic reporting)—but if you crave social media monitoring, Bark or mSpy start with free trials, then charge $14–49/mo; just remember to cancel before your free trial ends or you’ll get billed, and always read the fine print for sneaky automatic renewals!