# HD EIS vs KnowCamera

The clearest difference is iOS requirement: HD EIS at 8.0 against KnowCamera's 15.6. On price, update cadence, ads and in-app purchases there is nothing between them.

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

HD EIS ships an update every 2 weeks, KnowCamera fortnightly. The most recent releases landed on September 30, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | HD EIS | KnowCamera |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Size | 49 MB | 2 MB |
| Requires iOS | **8.0** | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Shenzhen Logic Electronics Technology Co.,Ltd](https://appshunter.io/developer/521003128) | [爱问答科技(北京)有限公司](https://appshunter.io/developer/1795400452) |

## What reviewers say

### HD EIS

[App page](https://appshunter.io/ios/app/hd-eis/id1538114470)

**Features:** macOS Compatibility

**In-app purchases:** none


### KnowCamera

[App page](https://appshunter.io/ios/app/knowcamera/id6745214202)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HD EIS free?

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

### Is KnowCamera free?

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

### Do HD EIS or KnowCamera have ads?

Neither HD EIS nor KnowCamera shows ads.

### Which is updated more often, HD EIS or KnowCamera?

HD EIS ships an update every 2 weeks, and KnowCamera fortnightly. Most recently, HD EIS was updated on September 30, 2026 and KnowCamera on October 1, 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.*