# BLE Tool

> BLE(Bluetooth Low Energy) test app. This app can be a GATT Server or a Client.

Canonical page: [https://chrome-stats.com/d/com.cozyoz.bletool](https://chrome-stats.com/d/com.cozyoz.bletool)

## Overview

- **ID:** `com.cozyoz.bletool`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** CozyOZ
- **Category:** TOOLS
- **Downloads:** 54,178
- **Rating:** 4.38 / 5 (114 ratings)
- **Version:** 1.35
- **Last updated:** 2019-10-31
- **First published:** 2017-10-20
- **Publisher country:** KR
- **Data as of:** 2026-09-11
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=com.cozyoz.bletool)
- **Privacy policy:** [http://app.cozyoz.com/bletool/privacy\_policy\_en.php](http://app.cozyoz.com/bletool/privacy_policy_en.php)

## Description

BLE Tool is a powerful Bluetooth Low Energy (BLE) test application designed for developers working with BLE embedded devices. It functions as both a GATT Server and Client, allowing users to scan remote BLE devices or advertise like a beacon. Users can configure services, characteristics, and descriptors as part of their device testing process.

This extension streamlines development by enabling seamless sending and receiving of data, making it an essential partner device for BLE device development and debugging. Its user-friendly interface and comprehensive features make BLE Tool an invaluable asset for efficient BLE device development and testing workflows.

## Rankings

- #289,499 — Overall

## Review summary

BLE Tool is a free, open-source Android app highly valued for creating BLE servers and debugging BLE software, especially useful for testing BLE client code with raw byte-level data. However, users report difficulties including inability to save/load configurations, user interface challenges, occasional crashes, and device compatibility issues for scanning advertising devices. The app is not currently visible on Android 14's Play Store, limiting accessibility. Despite these drawbacks, it remains an essential and effective utility for BLE testing and development.

### Pros

- Allows creation of a BLE server from the phone for testing BLE client code
- Free and functional tool for BLE testing and peripheral emulation
- Provides access to raw bytes essential for BLE testing
- Invaluable for debugging BLE software issues
- Open source project with available source code on Github

### Cons

- Cannot save and load GATT services and characteristic configurations, leading to data loss upon exiting the app
- App usability is somewhat difficult or not very user-friendly
- Occasional app crashes, such as on pressing the GATT server button
- Issues with scanning nearby advertising devices on some phones (e.g., Motorola)
- Not available or not displayed on Android 14's Play Store

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Source: [Chrome-Stats](https://chrome-stats.com/d/com.cozyoz.bletool)