# QR passcode validator vs Viewer for Trello

The clearest difference is in-app purchases: QR passcode validator at none against Viewer for Trello's 1. QR passcode validator also leads on iOS requirement (10.0 vs 16.0). Viewer for Trello's advantage is update cadence (every 4 days vs every 16 months). On price, ads and device support there is nothing between them.

Both are free to download. Viewer for Trello sells 1 one-off in-app purchase. QR passcode validator asks for nothing beyond the download.

QR passcode validator ships an update every 16 months, Viewer for Trello every 4 days. Both last shipped on September 17, 2026.

## The numbers

| Metric | QR passcode validator | Viewer for Trello |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 16 months | **Every 4 days** |
| Size | 3 MB | 2 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, Apple TV |
| Age rating | 12+ | 4+ |
| Developer | [Mercury Development, LLC](https://appshunter.io/developer/305978040) | [Appic Ltd.](https://appshunter.io/developer/984875987) |

## What reviewers say

### QR passcode validator

[App page](https://appshunter.io/ios/app/qr-passcode-validator/id1188686767)

**In-app purchases:** none


### Viewer for Trello

[App page](https://appshunter.io/ios/app/viewer-for-trello/id1548761411)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Board Access | $4.99 | one-time |


## Frequently asked questions

### Is QR passcode validator free?

QR passcode validator is free to download, with no in-app purchases.

### Is Viewer for Trello free?

Viewer for Trello is free to download, with in-app purchases available.

### Do QR passcode validator or Viewer for Trello have ads?

Neither QR passcode validator nor Viewer for Trello shows ads.

### Which is updated more often, QR passcode validator or Viewer for Trello?

QR passcode validator ships an update every 16 months, and Viewer for Trello every 4 days. Most recently, QR passcode validator was updated on September 17, 2026 and Viewer for Trello on September 17, 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.*