# Energy Efficiency Technologies vs i

The clearest difference is update cadence: Energy Efficiency Technologies at every 9 days against i's every 4 months. Energy Efficiency Technologies also leads on iOS requirement (9.0 vs 15.6). 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.

Energy Efficiency Technologies ships an update every 9 days, i every 4 months. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Energy Efficiency Technologies | i |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 4 months |
| Size | 99 MB | 86 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Guangdong Meizhi Compressor Co., Ltd.](https://appshunter.io/developer/1441287281) | [THINKCAR INC](https://appshunter.io/developer/1464847379) |

## What reviewers say

### Energy Efficiency Technologies

[App page](https://appshunter.io/ios/app/energy-efficiency-technologies/id6450695630)

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

**In-app purchases:** none


### i

[App page](https://appshunter.io/ios/app/i-venu/id6747736157)

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

**In-app purchases:** none


## Frequently asked questions

### Is Energy Efficiency Technologies free?

Energy Efficiency Technologies is free to download, with no in-app purchases.

### Is i free?

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

### Do Energy Efficiency Technologies or i have ads?

Neither Energy Efficiency Technologies nor i shows ads.

### Which is updated more often, Energy Efficiency Technologies or i?

Energy Efficiency Technologies ships an update every 9 days, and i every 4 months. Most recently, Energy Efficiency Technologies was updated on October 10, 2026 and i on October 14, 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.*