# SEM vs Terra Supreme Battery

The clearest difference is update cadence: SEM at every 2 weeks against Terra Supreme Battery's every 3 months. 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.

SEM ships an update every 2 weeks, Terra Supreme Battery every 3 months. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | SEM | Terra Supreme Battery |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (11 ratings)](https://appshunter.io/ios/app/sem-meter/id6468902139/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 37.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Free | — |
| Size | 31 MB | 38 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hangzhou Dashi Wisdom Technology Co., Ltd.](https://appshunter.io/developer/1822219570) | [Terra Supreme Battery LLC](https://appshunter.io/developer/1828144508) |

## 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


### Terra Supreme Battery

[App page](https://appshunter.io/ios/app/terra-supreme-battery/id6762522334)

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

**In-app purchases:** none


## Frequently asked questions

### Is SEM free?

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

### Is Terra Supreme Battery free?

Terra Supreme Battery is free to download, with no in-app purchases.

### Do SEM or Terra Supreme Battery have ads?

Neither SEM nor Terra Supreme Battery shows ads.

### Which is updated more often, SEM or Terra Supreme Battery?

SEM ships an update every 2 weeks, and Terra Supreme Battery every 3 months. Most recently, SEM was updated on November 3, 2026 and Terra Supreme Battery on October 31, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*