# 相册卫士 vs Calculator Sci Unit Converter

The clearest difference is price: 相册卫士 at Free against Calculator Sci Unit Converter's $1.99. 相册卫士 also leads on review sentiment (95% vs 67%). Calculator Sci Unit Converter's advantage is rating (4.0 vs 3.0) and update cadence (monthly vs every 6 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

相册卫士 is free to download; Calculator Sci Unit Converter costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calculator Sci Unit Converter holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews complicate that: 95% of 相册卫士's written reviews are positive against 67% of Calculator Sci Unit Converter's, so the app with the better star average is not the one people write more warmly about.

相册卫士 ships an update every 6 months, Calculator Sci Unit Converter monthly. The most recent releases landed on October 5, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | 相册卫士 | Calculator Sci Unit Converter |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/id1634782868/reviews) | **[4.0 (2 ratings)](https://appshunter.io/ios/app/calculator-sci-unit-converter/id6772422667/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | **94.7% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | **Free** | Paid |
| Size | 46 MB | 25 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [孝伟 李](https://appshunter.io/developer/981405429) | [Xiamen City Fanyou Network Technology Co., Ltd.](https://appshunter.io/developer/1842524161) |

## What reviewers say

### 相册卫士

[App page](https://appshunter.io/ios/app/id1634782868)

Securely encrypt and store your private photos and videos locally. Organize your memories into categorized albums, ensuring your personal content remains inaccessible to others. Protect your privacy with advanced encryption methods.

**Highlights:** Face ID encryption, Photo and video storage, Album categorization, Local storage, Privacy protection

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

**In-app purchases:** none


### Calculator Sci Unit Converter

[App page](https://appshunter.io/ios/app/calculator-sci-unit-converter/id6772422667)

This app offers a robust calculator with both standard and scientific functions. It includes a unit converter for various measurements and currency, plus helpful shortcuts for percentages, taxes, and tips. All calculations are saved locally for easy access.

**Highlights:** Standard and scientific calculator modes, Unit conversion for length, weight, temperature, currency, Full calculation history log, Percentage, tax, and tip calculation shortcuts, Offline functionality, Optimized for phone and tablet

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

**In-app purchases:** none


## Frequently asked questions

### Is 相册卫士 free?

相册卫士 is free to download, with no in-app purchases.

### Is Calculator Sci Unit Converter free?

Calculator Sci Unit Converter costs $1.99, with no in-app purchases.

### Which has better reviews, 相册卫士 or Calculator Sci Unit Converter?

Calculator Sci Unit Converter is rated higher. 相册卫士 averages 3.0 out of 5 from 2 ratings, while Calculator Sci Unit Converter averages 4.0 from 2 ratings.

### Do 相册卫士 or Calculator Sci Unit Converter have ads?

Neither 相册卫士 nor Calculator Sci Unit Converter shows ads.

### Which is updated more often, 相册卫士 or Calculator Sci Unit Converter?

相册卫士 ships an update every 6 months, and Calculator Sci Unit Converter monthly. Most recently, 相册卫士 was updated on October 5, 2026 and Calculator Sci Unit Converter on October 11, 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.*