# PDF Scanner Assistant vs Calculator Sci Unit Converter

The clearest difference is price: PDF Scanner Assistant at Free against Calculator Sci Unit Converter's $1.99. Calculator Sci Unit Converter's advantage is iOS requirement (13.0 vs 16.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

PDF Scanner Assistant 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.

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on September 9, 2026 and July 26, 2026 respectively.

## The numbers

| Metric | PDF Scanner Assistant | Calculator Sci Unit Converter |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | — | **[4.0 (2 ratings)](https://appshunter.io/ios/app/calculator-sci-unit-converter/id6772422667/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | Monthly |
| Monetization | — | Paid |
| Size | 9 MB | 25 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [乐祥 胡](https://appshunter.io/developer/1572365721) | [厦门市凡游网络科技有限公司](https://appshunter.io/developer/1842524161) |

## What reviewers say

### PDF Scanner Assistant

[App page](https://appshunter.io/ios/app/pdf-scanner-assistant/id6747924395)

**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 PDF Scanner Assistant free?

PDF Scanner Assistant 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.

### Do PDF Scanner Assistant or Calculator Sci Unit Converter have ads?

Neither PDF Scanner Assistant nor Calculator Sci Unit Converter shows ads.

### Which is updated more often, PDF Scanner Assistant or Calculator Sci Unit Converter?

PDF Scanner Assistant ships an update monthly, and Calculator Sci Unit Converter monthly. Most recently, PDF Scanner Assistant was updated on September 9, 2026 and Calculator Sci Unit Converter on July 26, 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.*