# LightBlue® — The go-to BLE development tool

> Bluetooth Low Energy development and testing tool for central and peripheral modes. (iPhone/iPad app by Punch Through.)

- Source: https://appshunter.io/ios/app/lightblue/id557428110 (this page in markdown: same URL + `.md`)
- Developer: [Punch Through](https://appshunter.io/developer/557428113)
- Category: Utilities
- Price: Free
- Rating: 4.30/5 from 940 App Store ratings · 292 written reviews indexed
- Age rating: 4+
- Requires: iOS 16.4 · 22 MB
- Languages: American English
- Released: 2012-09-08
- Data updated: 2026-08-27
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/lightblue/id557428110/reviews.md

## What is LightBlue®?

LightBlue® by Punch Through®
Your ultimate BLE debugging and development toolkit. Trusted by BLE developers and engineers since 2012 to scan, inspect, and troubleshoot Bluetooth Low Energy devices with precision.

Scan For Peripherals
 Discover, connect, and interact with nearby BLE devices. Quickly view advertising peripherals, sort by signal strength (RSSI), and connect with a single tap. Once connected, explore the device's advertisement data, services, and characteristics.

Isolate SDK Issues
 Simplify debugging by pinpointing issues in your BLE SDKs. LightBlue lets you isolate your app's business logic and focus on core tasks like connecting, scanning, reading, writing, and receiving notifications, built on years of BLE development experience and platform best practices.

Mimic Your Devices
 Prototype your application by creating virtual BLE peripherals. Build a profile from scratch or clone an advertising peripheral to mimic your product's functionality, even before your own firmware is ready.

Key features:

- Scan and discover BLE peripherals nearby
- Browse services and characteristics in detail
- Read, write, and subscribe to notifications and indications
- Send data from notifications to AWS IoT or Adafruit IO via Cloud Connect
- Write to characteristics in Hex, Octal, Binary, Decimal, or ASCII
- Clone peripheral profiles or build your own from scratch
- Advertise as a custom peripheral to simulate your device
- Thoroughly log and share BLE events
- Available on iPhone, iPad, Mac, and Android

LightBlue started in 2012 as an internal tool. Punch Through built it to test and debug BLE devices while working on client projects. It worked well, so we shared it with the community. We've kept it free ever since. Today, LightBlue is used by solo developers and engineering teams alike, including inside some of the world's most respected tech and device companies.

## Key features

- Scan and discover BLE peripherals
- Connect and view device profiles
- Read and write characteristics
- Subscribe to notifications
- Create and advertise virtual BLE devices
- Clone peripheral profiles
- Log and share BLE events

## What do users think of LightBlue®?

Overall sentiment: positive

**Pros**

- 🚀 Found lost devices
- 🔍 Helpful for locating Bluetooth devices
- 👍 Works great
- 👍 Lifesaver
- 👍 Fantastic app

**Cons**

- 🐛 Doesn't work with dead devices
- 🐛 Unreliable connection
- 🐛 Confusing to use
- 🐛 Doesn't work with all devices

**Commonly reported bugs**

- Crashes after updates
- Fails to connect Apple Pencil
- Doesn't detect all nearby devices

**Most requested features**

- Ability to manually name devices
- More precise location tracking
- Integration with Siri/Shortcuts

## Recent user reviews (10 of 292)

All indexed reviews: https://appshunter.io/ios/app/lightblue/id557428110/reviews.md

### 3/5 — Kinda works

*2026-08-07, version 5.3.7*

I can connect to my BLE IoT device, I can’t write UTF-8 Text because the popup thing has no “Ok” button when I try changing from Hex to a different format… it doesn’t make sense

### 5/5 — Found My Fitbit

*2026-07-14, version 5.3.6*

I Tried around 3 apps and couldn’t find it, on this app, the lower the signal of the number became, I knew I was closer, and eventually found it.

### 5/5 — pencil

*2026-07-06, version 5.3.6*

it connected my pencil to my iPad just fine! the password is 1234 for the Apple Pencil 1st gen

### 1/5 — Inaccurate

*2026-06-26, version 5.3.6*

Found my thing but bc it was my memory. 98 when I was in the same room with it.

### 5/5 — Found my oura ring!!

*2026-05-18, version 5.3.6*

Great app!! Helped me find my Oura ring!!!

### 1/5 — Complete lies

*2026-05-16, version 5.3.6*

Preview images show names of devices, which it in-fact does not do, you have to name them manually.. lets not even get started on its scan or connect for device alone, 5ft away from a device with bluetooth and it doesn’t even show up in the app at all, and dont even get me started with a smart watch, it doesnt even see that and thats less then 2 feet away at any time..

Completely broken with absolutely no point to the app other then seeing your device names(once input manually)

### 1/5 — The app does not work

*2026-04-23, version 5.3.5*

Lost my Fitbit while out hiking. Found out on the Fitbit app that there is no good way to locate it. The best suggestion they had was to see the last time it synced. These days it always tries to sync so there’s no record.

This app was mentioned in the Help files as a solution for iOS users. After walking for hundreds of yards, I started to doubt that this was even doing anything. Why not just open iOS settings, and look at my Bluetooth device devices that are connected?

Eventually, I found my watch on the trail. That was with my own eyes. The iOS settings did indicate a connection.  Went back to LightBlue to test it, toggled, a few buttons, no indication at all!

Dvlpr: 
Please reach out to Fitbit to remove this as a possible solution, finding one

### 5/5 — Helped me find my lost FitBit!

*2026-02-27, version 5.3.5*

I lost my FitBit in my house and the forums suggested this app. You do have to keep connecting to it as they don’t maintain a steady connection but it led me right to it. 
Fantastic for helping you track down your devices and free too!

### 5/5 — Works like a charm!

*2026-02-19, version 5.3.5*

Lost my Fitbit. Was able to walk around my home and was directed to the laundry room. Found it in the hammer there.  Highly recommended app!

### 1/5 — Not Useful Due To

*2026-01-12, version 5.3.5*

The app could not be used by me due to the apps design. The app uses very light colored fonts on a white background with no way to change or use dark mode to help use the app. Larger fonts would be nice to.

## Frequently asked questions about LightBlue®

### What does the LightBlue app do?

LightBlue is a tool designed for interacting with Bluetooth Low Energy (BLE) devices. It allows you to scan for and connect to BLE peripherals, inspect their services and characteristics, read and write data, and subscribe to notifications. It also enables you to simulate your own BLE peripheral devices.

### What are the key features of LightBlue?

Key features include scanning for BLE devices, viewing device information like UUID and RSSI, browsing services and characteristics, registering for notifications, reading and writing characteristic values in various formats, cloning peripheral profiles, creating custom virtual peripherals, and logging BLE events.

### Is LightBlue free to use?

Yes, the app is free to download and use. It is supported by advertisements, which are displayed within the application.

### What kind of devices can I test with LightBlue?

You can use LightBlue to test a wide range of BLE devices, including heart rate monitors, temperature sensors, development boards from manufacturers like Microchip and Nordic, and custom BLE peripherals you are developing.

### How can I use LightBlue to test my own BLE firmware?

LightBlue is ideal for testing your own BLE peripherals. You can advertise your iOS device as a custom BLE peripheral, define its services and characteristics, and then use the central mode to connect to and test its functionality, ensuring your firmware behaves as expected.

## Version history (last 5 releases)

### 5.3.7 — 2026-07-24

Minor bug fixes and app improvements.

### 5.3.6 — 2026-05-05

New Log Filtering and Bug fixes.

### 5.3.5 — 2025-10-25

Minor bug fixes and updates

### 5.3.4 — 2025-08-15

Bug fixes and minor performance improvements.

### 5.3.3 — 2025-05-20

- Updated our Privacy Policy link
- Added new User Education feature that enables navigation to related webpages to enhance understanding of app functionality
- Minor bug fixes

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## More apps by Punch Through

- [Bean Loader - LightBlue Bean](https://appshunter.io/ios/app/bean-loader-lightblue-bean/id936509473)

All apps by Punch Through: https://appshunter.io/developer/557428113

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-27.*