# Atom HMI vs PDF Docs PDF Scanner

The clearest difference is in-app purchases: Atom HMI at none against PDF Docs PDF Scanner's 3. Atom HMI also leads on ads (none vs shown) and iOS requirement (13.0 vs 17.6). PDF Docs PDF Scanner's advantage is update cadence (every 3 weeks vs every 25 months). On price and device support there is nothing between them.

Both are free to download. PDF Docs PDF Scanner sells 3 in-app purchases, starting at $5.99 per 7 days. Atom HMI asks for nothing beyond the download.

Atom HMI ships an update every 25 months, PDF Docs PDF Scanner every 3 weeks. The most recent releases landed on November 3, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | Atom HMI | PDF Docs PDF Scanner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (91 ratings)](https://appshunter.io/ios/app/pdf-docs-pdf-scanner/id1602797155/reviews)** |
| Number of ratings | — | **91** |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 25 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 7 MB | 34 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Adam Mandel](https://appshunter.io/developer/1230194566) | [Hazel Mobile](https://appshunter.io/developer/1555634974) |

## What reviewers say

### Atom HMI

[App page](https://appshunter.io/ios/app/atom-hmi/id1518658810)

**Features:** macOS Compatibility

**In-app purchases:** none


### PDF Docs PDF Scanner

[App page](https://appshunter.io/ios/app/pdf-docs-pdf-scanner/id1602797155)

Easily scan documents and save them as high-quality PDFs or JPEGs. Features include batch scanning, cloud integration, and secure sharing. OCR technology digitizes text for easy access and sharing.

**Highlights:** High-quality document scanning, Batch scanning for multiple pages, Cloud integration for easy access, Share and export to various formats, OCR technology for text digitization, Secure and private with passcode protection

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads & File Share - Week | $5.99 | per 7 days |
| Remove Ads & File Share -Month | $7.99 | per month |
| Remove Ads & Share Files | $19.99 | one-time |


## Frequently asked questions

### Is Atom HMI free?

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

### Is PDF Docs PDF Scanner free?

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

### Do Atom HMI or PDF Docs PDF Scanner have ads?

PDF Docs PDF Scanner shows ads; Atom HMI does not.

### Which is updated more often, Atom HMI or PDF Docs PDF Scanner?

Atom HMI ships an update every 25 months, and PDF Docs PDF Scanner every 3 weeks. Most recently, Atom HMI was updated on November 3, 2026 and PDF Docs PDF Scanner on November 12, 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.*