# O vs NFC Tag Encoder

The clearest difference is iOS requirement: NFC Tag Encoder at 13.0 against O's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

O ships an update every 5 weeks, NFC Tag Encoder every 2 months. The most recent releases landed on October 10, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | O | NFC Tag Encoder |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Size | 34 MB | 20 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [PUFin ID A/S](https://appshunter.io/developer/1614643757) | [SILICON CRAFT TECHNOLOGY PUBLIC COMPANY LIMITED](https://appshunter.io/developer/1279674870) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-key-verifier/id1614643755)

**In-app purchases:** none


### NFC Tag Encoder

[App page](https://appshunter.io/ios/app/nfc-tag-encoder/id6740401948)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is NFC Tag Encoder free?

NFC Tag Encoder is free to download, with no in-app purchases.

### Do O or NFC Tag Encoder have ads?

Neither O nor NFC Tag Encoder shows ads.

### Which is updated more often, O or NFC Tag Encoder?

O ships an update every 5 weeks, and NFC Tag Encoder every 2 months. Most recently, O was updated on October 10, 2026 and NFC Tag Encoder on October 5, 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.*