# Field Strength Estimator vs Bluetooth BLE Device Finder

Field Strength Estimator and Bluetooth BLE Device Finder both sit at 4.3 stars, but that hides the real split: 100% of Field Strength Estimator's written reviews are positive against 39% of Bluetooth BLE Device Finder's. Field Strength Estimator also leads on in-app purchases (none vs 4) and iOS requirement (8.0 vs 13.0). Bluetooth BLE Device Finder's advantage is update cadence (every 2 months vs every 13 months) and ratings volume (27K vs 4). On price, rating, ads and device support there is nothing between them.

Both are free to download. Bluetooth BLE Device Finder sells 4 in-app purchases, starting at $3.99 per 7 days. Field Strength Estimator asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.3 for Field Strength Estimator against 4.4 for Bluetooth BLE Device Finder. That said, the two scores are not equally well evidenced: Bluetooth BLE Device Finder has 27K ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 100% of Field Strength Estimator's written reviews are positive against 39% of Bluetooth BLE Device Finder's.

Field Strength Estimator ships an update every 13 months, Bluetooth BLE Device Finder every 2 months. The most recent releases landed on October 23, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Field Strength Estimator | Bluetooth BLE Device Finder |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (4 ratings)](https://appshunter.io/ios/app/field-strength-estimator/id364229792/reviews) | **[4.4 (27K ratings)](https://appshunter.io/ios/app/bluetooth-ble-device-finder/id1465245157/reviews)** |
| Number of ratings | 4 | **27K** |
| Positive reviews | **100.0% of reviews** | 39.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 72 MB | 3 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rohde & Schwarz GmbH & Co. KG](https://appshunter.io/developer/364229795) | [Raymond NG](https://appshunter.io/developer/306272232) |

## What reviewers say

### Field Strength Estimator

[App page](https://appshunter.io/ios/app/field-strength-estimator/id364229792)

This app estimates field strength and power flux density based on transmitted power, frequency, and antenna gain. It calculates received power at a receiver and automatically converts power flux density to electric and magnetic field strength. It provides theoretical best-case values, not accounting for real-world propagation impairments.

**Highlights:** Calculates power flux density, Estimates electric and magnetic field strength, Calculates received power, Considers antenna gain and transmitted power, Assumes theoretical best-case conditions

**Features:** macOS Compatibility

**In-app purchases:** none


### Bluetooth BLE Device Finder

[App page](https://appshunter.io/ios/app/bluetooth-ble-device-finder/id1465245157)

Quickly locate misplaced Bluetooth devices using signal strength and a radar interface. Track devices in the background and receive notifications when they are lost, with the last known location recorded on a map.

**Highlights:** Find lost Bluetooth devices, Track devices in the background, Receive disconnection notifications, View last detected time and location, Use radar interface for proximity, Show signal strength and estimated distance, Display BLE device details

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| One Week Premium | $3.99 | per 7 days |
| One Month Premium | $9.99 | per month |
| One Year Premium | $14.99 | per year |
| Lifetime Premium | $19.99 | one-time |

**What reviewers like**

- 🚀 Accurately locates lost devices
- 👍 Helpful for finding misplaced items
- 🔍 Effective at tracking Bluetooth signals
- 💡 Useful for finding lost AirPods, Fitbits, and other Bluetooth devices

**What reviewers complain about**

- 💰 Mandatory subscription/premium version required for full functionality
- 🤔 Difficulty distinguishing between unknown Bluetooth devices
- 🤷‍♀️ Inconsistent or inaccurate distance/signal strength readings
- 🙄 Constant prompts to upgrade to premium version

**Reported bugs**

- Unable to detect certain Bluetooth devices like Apple Pencil
- App crashes or freezes on some devices
- Persistent pairing requests from unknown devices

**Requested features**

- Ability to name/label Bluetooth devices
- Option to use feet/yards instead of meters
- Improved device filtering and organization
- More precise tracking and direction indicators


## Frequently asked questions

### Is Field Strength Estimator free?

Field Strength Estimator is free to download, with no in-app purchases.

### Is Bluetooth BLE Device Finder free?

Bluetooth BLE Device Finder is free to download, with in-app purchases available.

### Which has better reviews, Field Strength Estimator or Bluetooth BLE Device Finder?

Bluetooth BLE Device Finder is rated higher. Field Strength Estimator averages 4.3 out of 5 from 4 ratings, while Bluetooth BLE Device Finder averages 4.4 from 27K ratings.

### Do Field Strength Estimator or Bluetooth BLE Device Finder have ads?

Neither Field Strength Estimator nor Bluetooth BLE Device Finder shows ads.

### Which is updated more often, Field Strength Estimator or Bluetooth BLE Device Finder?

Field Strength Estimator ships an update every 13 months, and Bluetooth BLE Device Finder every 2 months. Most recently, Field Strength Estimator was updated on October 23, 2026 and Bluetooth BLE Device Finder on November 3, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*