# Causality vs Smart Printer－PDF Scanner

The clearest difference is in-app purchases: Causality at none against Smart Printer－PDF Scanner's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Smart Printer－PDF Scanner sells 2 in-app purchases, starting at $4.99 per month. Causality asks for nothing beyond the download.

Causality ships an update fortnightly, Smart Printer－PDF Scanner every 2 weeks. The most recent releases landed on September 26, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Causality | Smart Printer－PDF Scanner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (6 ratings)](https://appshunter.io/ios/app/causality-physdigital-nexus/id1659176432/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 13 MB | 9 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Clever Guerrilla Inc.](https://appshunter.io/developer/1745793786) | [Ravi chandran M](https://appshunter.io/developer/1756258598) |

## What reviewers say

### Causality

[App page](https://appshunter.io/ios/app/causality-physdigital-nexus/id1659176432)

Discover and interact with physical products and locations linked to digital experiences. Use NFC tags to unlock engaging activations that bridge the physical and digital worlds. No account or complex setup required, just tap and explore.

**Highlights:** Discover NFC-tagged products, Access IRL waypoints, Engage in digital activations, Connect physical and digital, No account creation needed

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart Printer－PDF Scanner

[App page](https://appshunter.io/ios/app/smart-printerpdf-scanner/id6736524560)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly plan | $4.99 | per month |
| Annual Plan | $14.99 | per year |


## Frequently asked questions

### Is Causality free?

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

### Is Smart Printer－PDF Scanner free?

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

### Do Causality or Smart Printer－PDF Scanner have ads?

Neither Causality nor Smart Printer－PDF Scanner shows ads.

### Which is updated more often, Causality or Smart Printer－PDF Scanner?

Causality ships an update fortnightly, and Smart Printer－PDF Scanner every 2 weeks. Most recently, Causality was updated on September 26, 2026 and Smart Printer－PDF Scanner on October 6, 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.*