# SMS Alert vs YY BMS

The clearest difference is update cadence: YY BMS at every 6 weeks against SMS Alert's every 14 months. SMS Alert's advantage is iOS requirement (9.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SMS Alert ships an update every 14 months, YY BMS every 6 weeks. The most recent releases landed on July 7, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | SMS Alert | YY BMS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (2 ratings)](https://appshunter.io/ios/app/sms-alert/id1100172188/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 7 MB | 30 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [朝山 马](https://appshunter.io/developer/596304901) | [Wuhan Yanyang IoT Technology Co., Ltd.](https://appshunter.io/developer/1573509034) |

## What reviewers say

### SMS Alert

[App page](https://appshunter.io/ios/app/sms-alert/id1100172188)

This app monitors temperature, humidity, analog signals, and power status for various devices. It sends alerts via SMS and phone calls when predefined limits are reached. Users can also query device status via text and schedule periodic reports.

**Highlights:** Temperature and humidity monitoring, Analog signal monitoring (4-20mA, 0-5V), Power monitoring (single/three-phase), SMS and phone call alerts, Remote status query via text, Scheduled status reporting, Modbus RTU/TCP cloud platform support

**Features:** macOS Compatibility

**In-app purchases:** none


### YY BMS

[App page](https://appshunter.io/ios/app/yy-bms/id1574291362)

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

**In-app purchases:** none


## Frequently asked questions

### Is SMS Alert free?

SMS Alert is free to download, with no in-app purchases.

### Is YY BMS free?

YY BMS is free to download, with no in-app purchases.

### Do SMS Alert or YY BMS have ads?

Neither SMS Alert nor YY BMS shows ads.

### Which is updated more often, SMS Alert or YY BMS?

SMS Alert ships an update every 14 months, and YY BMS every 6 weeks. Most recently, SMS Alert was updated on July 7, 2026 and YY BMS on September 7, 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.*