# SEM vs ANCEL BM300 Pro

The clearest difference is rating: SEM at 3.4 against ANCEL BM300 Pro's 2.8. SEM also leads on update cadence (every 2 weeks vs monthly). On price, review sentiment, ratings volume and ads there is nothing between them.

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

SEM holds the better App Store score, 3.4 against 2.8. Both are backed by a comparable volume of ratings — 11 and 21 respectively. Written reviews split almost evenly too, at 38% and 37% positive.

SEM ships an update every 2 weeks, ANCEL BM300 Pro monthly. The most recent releases landed on September 9, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | SEM | ANCEL BM300 Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (11 ratings)](https://appshunter.io/ios/app/sem-meter/id6468902139/reviews)** | [2.8 (21 ratings)](https://appshunter.io/ios/app/ancel-bm300-pro/id6476840644/reviews) |
| Number of ratings | 11 | **21** |
| Positive reviews | **37.5% of reviews** | 36.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Monthly |
| Monetization | Free | Free |
| Size | 31 MB | 68 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Dashi Wisdom Technology Co., Ltd.](https://appshunter.io/developer/1822219570) | [OBDSPACE TECHNOLOGY CO.,LTD](https://appshunter.io/developer/1434956144) |

## What reviewers say

### SEM

[App page](https://appshunter.io/ios/app/sem-meter/id6468902139)

This utility app monitors your household power consumption in real-time, providing historical data and comparisons to help you save on electricity bills. It supports managing multiple devices and customizing electricity fee calculations.

**Highlights:** Real-time power usage monitoring, Historical energy use tracking, Second-to-second, day-to-day, week-to-week, month-to-month, and year-to-year comparisons, Electricity fee gradient calculation, Customizable fee templates, Multiple device management

**In-app purchases:** none


### ANCEL BM300 Pro

[App page](https://appshunter.io/ios/app/ancel-bm300-pro/id6476840644)

This app monitors 6V, 12V, and 24V batteries, allowing simultaneous tracking of up to four. It provides insights into battery health by testing startup and charging system voltage, and accurately records vehicle start and stop times. All data is accessible on your phone via Bluetooth for easy vehicle battery management.

**Highlights:** Monitors 6V, 12V, 24V batteries, Simultaneous monitoring of four batteries, Tests startup and charging system voltage, Records vehicle start/stop times, Bluetooth data display on phone, Vehicle battery power management

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SEM free?

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

### Is ANCEL BM300 Pro free?

ANCEL BM300 Pro is free to download, with no in-app purchases.

### Which has better reviews, SEM or ANCEL BM300 Pro?

SEM is rated higher. SEM averages 3.4 out of 5 from 11 ratings, while ANCEL BM300 Pro averages 2.8 from 21 ratings.

### Do SEM or ANCEL BM300 Pro have ads?

Neither SEM nor ANCEL BM300 Pro shows ads.

### Which is updated more often, SEM or ANCEL BM300 Pro?

SEM ships an update every 2 weeks, and ANCEL BM300 Pro monthly. Most recently, SEM was updated on September 9, 2026 and ANCEL BM300 Pro on September 18, 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.*