# STEMS EV vs 电耗账本

The clearest difference is in-app purchases: STEMS EV at none against 电耗账本's 1. STEMS EV also leads on device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. 电耗账本 sells 1 one-off in-app purchase. STEMS EV asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 5 days. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | STEMS EV | 电耗账本 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | Every 5 days |
| Size | 16 MB | 2 MB |
| Requires iOS | **16** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [台科電科技股份有限公司](https://appshunter.io/developer/1826972531) | [杰栋 何](https://appshunter.io/developer/1896629335) |

## What reviewers say

### STEMS EV

[App page](https://appshunter.io/ios/app/stems-ev/id6753740708)

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

**In-app purchases:** none


### 电耗账本

[App page](https://appshunter.io/ios/app/id6773849566)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 电耗账本 Pro | $3.99 | one-time |


## Frequently asked questions

### Is STEMS EV free?

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

### Is 电耗账本 free?

电耗账本 is free to download, with in-app purchases available.

### Do STEMS EV or 电耗账本 have ads?

Neither STEMS EV nor 电耗账本 shows ads.

### Which is updated more often, STEMS EV or 电耗账本?

STEMS EV ships an update every 5 days, and 电耗账本 every 5 days. Most recently, STEMS EV was updated on October 6, 2026 and 电耗账本 on October 8, 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.*