---
title: "UM_Meter - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "Data display and system operation of the USB tester via Bluetooth, and data storage and sharing functions."
---

# UM_Meter — United States
> USB 测试仪

![UM_Meter App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple123/v4/b2/5b/f5/b25bf5a6-0416-f94f-c64f-7285ec36eb79/AppIcon-3-0-1x_U007emarketing-0-0-85-220-5.png/434x0w.png)

**Developer:** [亮亮 刘](https://apptail.io/developer/developer-aCHc)
**Category:** Utilities
**Rating:** 2.4/5 (17 ratings)
**Price:** Free
**Bundle ID:** com.RuiDengTechnology.ummeter
**Store:** Apple App Store
**Country:** United States
**Version:** 1.2.1 (released 2019-07-23)
**Original Release:** 2018-10-19
**Languages:** German, English, French, Hindi, Indonesian, Japanese, Korean, Latvian, Dutch, Polish, Russian, Slovak, Spanish, Thai, Chinese, Czech, Turkish, Ukrainian, Hungarian

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id1439150213)
**AppTail Page:** [https://apptail.io/app/um-meter-Vbpe/united-states](https://apptail.io/app/um-meter-Vbpe/united-states)

## UM_Meter Description
Data display and system operation of the USB tester via Bluetooth, and data storage and sharing functions.

## UM_Meter Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple113/v4/57/58/6e/57586e7d-2a6c-92e4-3c7d-45f4d7070ea4/pr_source.png/1242x2688.png)

## UM_Meter Rating Breakdown in United States
- 5 stars: 3 (18%)
- 4 stars: 4 (24%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 10 (59%)

## UM_Meter Reviews in United States

### *---- "Used to Work Great"
The app hasn’t been updated in 5 years. As such, it no longer connects to my UM34C. Looking at the reviews, it looks like it doesn’t work with anything running on a remotely modern IOS release. It is now effectively useless. They need to update this app.
-- AtariST512, 2024-11-11

### *---- "App does not work AT ALL!!!"
Update this app!! Or all of your products are useless...
-- pigmen11, 2022-07-08

### *---- "cannot find any devices via bluetooth"
no ble devices show up when you go to the bluetooth menu, or click Find within.
-- auntie.christmas, 2021-08-06

### *---- "Doesn’t find any of my devices!"
I was so happy to see the app is coming on iOS too, but that was for nothing. Because the app doesn’t do anything. I have 6 USB testers, and the app can’t see any of them. They all work on Android though. :(

Update: with the new iPhone 12 Pro Max it doesn't even start anymore.
-- Alfamonk, 2020-11-28

### ***** "Worked on first try, very slick!!!! UM34C"
Awesome! This uses a special minimal Bluetooth connection that DOES NOT REQUIRE ANY PAIRING. You simply grant Yes to Allow app to access Bluetooth and it magically connects! Easiest Bluetooth I’ve ever seen. 

I bought my UM34C from AliExpress for around $20 or less during a sale. ITS INCREDIBLE. I wanted one for so long and I don’t know why I waited this long! I’m interested in evaluating the U2-WEB, a more sophisticated competitor that’s priced around $30-$40 with a larger screen. 
——

Note:
⚠️ Only UM25C bought from official Store before Dec 15th, 2018 support iOS

The AliExpress listing for the UM25C on "RD official store" states: 

"From china time Dec 15th, 2018, UM25C began support iOS app. 
If you buy it AFTER Dec 15th at RD official store, it supports iOS app. BEFORE 15th, it can't."
-- Syclone Josh, 2020-05-27

### ****- "Almost a 5 star app"
I had to knock a star off because I,too got the “unable to connect” and “ device not compatible “ error” when trying to link my BlueTooth to it. 

I found that you still have to open the app and from the first option “find” the device and swipe the toggle switch on THEN you’ll see it under your Bluetooth settings. Essentially... you’ll never use your iPhone settings to manage the Bluetooth connection to this thing. It’s all done within the app. I almost returned it until I blindly stumbled into that ‘fix’. 

Checking out the app though it seems to work very well. I got the UM34C so your mileage may very. Good features that work well. Exports data and a few triggers you can set and options I didn’t even know it had. 

So quite happy but the developer needs to either clarify the Bluetooth setup or make the setup work like every other Bluetooth device does.
-- DeadboltSecurity, 2020-02-19

### *---- "App doesn’t open"
I just bought my usb monitor off AliExpress and paid extra for the Bluetooth option. None of the manuals in the box mention Bluetooth at all. The app doesn’t open, just presents a black screen. I’m going to be asking for a refund. Also the Bluetooth module is too big and blocks access to plug in the device at all! Poor design, I’d say.
-- RulerK, 2019-12-10

### ***** "UM34C v2.3 work perfect"
Using UM34C v2.3 with iphone 7
-- Emilrosales, 2019-05-25

### ***** "Works Great !!!"
Works great on my IPhone SE. Connects fast. Also works great on my iPad.
-- qiopwert, 2019-02-10

### *---- "iOS not!"
If it’s too good to be true, it probably is! App won’t even open! Manual available with QR Code is only for Android, not iOS! Looks like I’ve been suckered!
-- kfmdj, 2019-02-01

[View all UM_Meter reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)





## UM_Meter Available In
- [Germany](https://apptail.io/app/um-meter-Vbpe/germany)
- [United States](https://apptail.io/app/um-meter-Vbpe/united-states)
- [France](https://apptail.io/app/um-meter-Vbpe/france)
- [Taiwan](https://apptail.io/app/um-meter-Vbpe/taiwan)
- [Netherlands](https://apptail.io/app/um-meter-Vbpe/netherlands)
- [Singapore](https://apptail.io/app/um-meter-Vbpe/singapore)
- [Türkiye](https://apptail.io/app/um-meter-Vbpe/turkey)
- [India](https://apptail.io/app/um-meter-Vbpe/india)
- [Indonesia](https://apptail.io/app/um-meter-Vbpe/indonesia)
- [Vietnam](https://apptail.io/app/um-meter-Vbpe/vietnam)
- [Estonia](https://apptail.io/app/um-meter-Vbpe/estonia)
- [Ireland](https://apptail.io/app/um-meter-Vbpe/ireland)
- [Iceland](https://apptail.io/app/um-meter-Vbpe/iceland)
- [Lithuania](https://apptail.io/app/um-meter-Vbpe/lithuania)
- [North Macedonia](https://apptail.io/app/um-meter-Vbpe/north-macedonia)
- [Philippines](https://apptail.io/app/um-meter-Vbpe/philippines)
- [Pakistan](https://apptail.io/app/um-meter-Vbpe/pakistan)
- [Belarus](https://apptail.io/app/um-meter-Vbpe/belarus)

---

## About AppTail

[AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends.

- [Search Apps](https://apptail.io)
- [Top Charts](https://apptail.io/top-iphone-apps)
- [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer)

*Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*