Built-in iPhone and Android tracker alerts vs a scanner app

What built-in alerts do well

Built-in unknown-tracker alerts run automatically in the background, cost nothing and are deeply integrated into the phone: they can show a map of where the tracker travelled with you, play a sound, help you find it and show how to disable it.

• iPhone and iPad: “AirTag Found Moving With You” and similar alerts for Find My accessories and AirPods; since iOS 17.5 also for compatible trackers from other brands. Precision Finding for AirTags on iPhones with Ultra Wideband. Serial number via NFC and disable instructions.
• Android: unknown tracker alerts for Find Hub compatible tags, headphones and AirTags, a map, Play sound, Find nearby for Find Hub trackers and a Scan now button.

Where built-in alerts stop

• They take time. Alerts appear when a tracker is seen moving with you over time; Google notes you need to physically move with the tracker before an alert. Apple does not publish the exact timing.
• No manual scan on iPhone. You can’t ask iOS to check a hotel room or a second-hand bag right now.
• Coverage depends on the tracker. Trackers outside the Find My and Find Hub networks are only covered if their model supports the shared specification.
• Identifiers change. When a tracker changes its Bluetooth identifier, your phone may treat it as a new tracker.
• Settings matter. On iPhone, Location Services, Significant Locations, Bluetooth and Tracking Notifications must be on and Airplane Mode off.

What a scanner app adds

A dedicated tracker detector such as TrackerSonar listens to all Bluetooth signals around you on demand and shows you what it finds, in seconds.

• Check right now — a hotel room, a rental car, a bag after a trip — on iPhone and iPad too.
• See every tracker nearby: AirTag and Find My accessories, Tile, Samsung Galaxy SmartTag, Chipolo, Pebblebee and Google Find Hub tags, plus other Bluetooth devices.
• Find it physically: TrackerSonar’s Live Locate (Premium) turns any detected device’s signal into a warmer/colder guide with a direction sweep.
• Your own evidence: TRACKED badges and (Premium) a sightings map and timeline of where a device turned up in your scans.
• Background alerts (Premium) as an extra layer while the app runs in the background.

What a scanner app can’t do

• It can’t tell you who owns a tracker or show an AirTag’s serial number; use the NFC steps in what to do if you find a tracker.
• It can’t disable a tracker remotely.
• It can’t find trackers that are switched off, out of range or don’t use Bluetooth.
• On iPhone, background scanning is limited by iOS; scans while the app is open are the most complete.

Side-by-side comparison

When built-in alerts are enough — and when to add an app

Built-in alerts are usually enough if you have no specific reason for concern, your phone is up to date with alerts switched on, and you mainly worry about AirTags.

Add a scanner app if you want to check a place or a bag right now, you use an iPhone (no manual scan), you are worried about Tile, SmartTag or other brands, you received an alert but can’t find the tracker, or you want your own record of where a device turned up. TrackerSonar is one such app; Android users also have the free built-in manual scan.