# Sentarm vs PDF Scan

The clearest difference is review sentiment: PDF Scan at 100% against Sentarm's 50%. PDF Scan also leads on rating (5.0 vs 4.2) and iOS requirement (16.6 vs 26.0). Sentarm's advantage is update cadence (weekly vs every 2 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Sentarm sells 4 one-off in-app purchases and PDF Scan sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

PDF Scan holds the better App Store score, 5.0 against 4.2. Both are backed by a comparable volume of ratings — 5 and 3 respectively. Written reviews point the same way: 50% of Sentarm's written reviews are positive against 100% of PDF Scan's.

Sentarm ships an update weekly, PDF Scan every 2 months. The most recent releases landed on October 5, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Sentarm | PDF Scan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (5 ratings)](https://appshunter.io/ios/app/sentarm/id6747161489/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/pdf-scan-scanner-and-reader/id6751232307/reviews)** |
| Number of ratings | **5** | 3 |
| Positive reviews | 50.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Free with in-app purchases | Freemium |
| Size | 45 MB | 3 MB |
| Requires iOS | 26.0 | **16.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [永康 梁](https://appshunter.io/developer/1789349442) | [家宝 戴](https://appshunter.io/developer/1826395838) |

## What reviewers say

### Sentarm

[App page](https://appshunter.io/ios/app/sentarm/id6747161489)

This smart alarm assistant simplifies setting alarms for complex and rotating schedules. It offers holiday recognition, custom calendars, and a minimalist interface for ease of use. Widgets, dark mode, and multi-language support enhance the user experience.

**Highlights:** Customizable work schedule alarms, Automatic holiday and special date skipping, Multiple regional and custom calendars, Convenient alarm and calendar widgets, Dark mode and multi-language support

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Custom Sound | Free | one-time |
| Custom Calendar | $0.99 | one-time |
| Widgets | $0.99 | one-time |
| Missions | $1.99 | one-time |


### PDF Scan

[App page](https://appshunter.io/ios/app/pdf-scan-scanner-and-reader/id6751232307)

This app transforms your iPhone into a powerful document scanner. Quickly capture and digitize documents, receipts, and business cards, creating high-quality PDF files. Organize, manage, and share your scans with ease, with advanced features available via subscription.

**Highlights:** Scan documents instantly, Automatic edge detection and cropping, High-quality PDF creation, Multi-page scanning, Document management tools, Share and export scans

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PDFScan Pro Monthly | $4.99 | per month |
| PDFScan Pro Yearly | $39.99 | per year |


## Frequently asked questions

### Is Sentarm free?

Sentarm is free to download, with in-app purchases available.

### Is PDF Scan free?

PDF Scan is free to download, with in-app purchases available.

### Which has better reviews, Sentarm or PDF Scan?

PDF Scan is rated higher. Sentarm averages 4.2 out of 5 from 5 ratings, while PDF Scan averages 5.0 from 3 ratings.

### Do Sentarm or PDF Scan have ads?

Neither Sentarm nor PDF Scan shows ads.

### Which is updated more often, Sentarm or PDF Scan?

Sentarm ships an update weekly, and PDF Scan every 2 months. Most recently, Sentarm was updated on October 5, 2026 and PDF Scan on September 30, 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.*