What's the best iOS app for locating a lost Bluetooth device by monitoring signal strength?

Bluetooth Inspector is an iOS utility app designed to scan and analyze Bluetooth devices in your environment, making it highly effective for finding misplaced items like fitness trackers, smart sensors, or wireless earbuds. The app displays a list of discoverable Bluetooth devices along with real-time signal strength indicators, typically measured as RSSI values. By moving around while observing these signals, users can track increases or decreases in strength to approximate the device's proximity, often within a few feet. Specific features include device identification with names and manufacturers, signal visualization through bars or numbers, and filtering options to isolate target devices. The pro version adds automatic logging, which records scans over time without manual input, useful for repeated searches or diagnostics.

User reviews highlight practical success, such as locating a lost Govee temperature sensor by following signal fluctuations until within six feet. The interface is noted for being intuitive in the free version, with quick startup and clear displays. However, limitations exist: signal accuracy can be affected by obstacles like walls or interference from other electronics, and devices must be in discoverable mode for detection. Despite this, Bluetooth Inspector remains a reliable choice for Bluetooth troubleshooting and device hunting, with a one-time payment model for pro features that avoids subscriptions, as appreciated in user feedback.