# Máster Ortodoncia UCM vs VIIO

The clearest difference is in-app purchases: Máster Ortodoncia UCM at none against VIIO's 10. VIIO's advantage is update cadence (every 9 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. VIIO sells 10 in-app purchases, starting at $2.99 per month. Máster Ortodoncia UCM asks for nothing beyond the download.

Máster Ortodoncia UCM ships an update every 2 months, VIIO every 9 days. The most recent releases landed on October 3, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Máster Ortodoncia UCM | VIIO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (1.2K ratings)](https://appshunter.io/ios/app/viio-text-reader/id1570401477/reviews)** |
| Number of ratings | — | **1.2K** |
| Positive reviews | — | 68.4% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | — | Free with in-app purchases |
| Size | 6 MB | 124 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [Pixel Innovación y Desarrollo SL](https://appshunter.io/developer/1216195747) | [Otonye Bestman](https://appshunter.io/developer/1466177310) |

## What reviewers say

### Máster Ortodoncia UCM

[App page](https://appshunter.io/ios/app/master-ortodoncia-ucm/id1216195748)

**Features:** macOS Compatibility

**In-app purchases:** none


### VIIO

[App page](https://appshunter.io/ios/app/viio-text-reader/id1570401477)

Transform written content into spoken audio with this app. Easily convert text from documents, PDFs, or copied content into a clear, audible format. Customize voice, speed, and pitch for a personalized listening experience.

**Highlights:** Text-to-speech conversion, Read aloud from documents and PDFs, Copy text for audio playback, Adjustable reading speed, Customizable voice options, Highlighting important sections

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus plan | $2.99 | per month |
| HD plan | $6.99 | per month |
| Human plan | $16.99 | per month |
| HD yearly plan | $59.99 | per year |
| 50,000 characters | $0.99 | one-time |
| 100,000 characters | $1.99 | one-time |
| 200,000 characters | $2.99 | one-time |
| 50,000 human characters | $3.99 | one-time |
| 100,000 human characters | $5.99 | one-time |
| 200,000 human characters | $10.99 | one-time |

**What reviewers like**

- 💡 Useful for reading and comprehension
- 👍 Easy to use and navigate
- 🚀 Efficient text-to-speech functionality
- 👍 Helpful for neurodiverse users

**What reviewers complain about**

- 🐛 Frequent crashes and stability issues
- 🔒 Concerns about paid subscription model
- 🔋 Complaints about character/word limits in free version
- 👎 Robotic or unnatural-sounding voices

**Reported bugs**

- App crashes after updates
- Inconsistent performance across devices
- Issues with text recognition and pronunciation

**Requested features**

- Ability to adjust reading speed
- Support for more languages and accents
- Improved PDF and document handling
- Integration with other reading/productivity apps


## Frequently asked questions

### Is Máster Ortodoncia UCM free?

Máster Ortodoncia UCM is free to download, with no in-app purchases.

### Is VIIO free?

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

### Do Máster Ortodoncia UCM or VIIO have ads?

Neither Máster Ortodoncia UCM nor VIIO shows ads.

### Which is updated more often, Máster Ortodoncia UCM or VIIO?

Máster Ortodoncia UCM ships an update every 2 months, and VIIO every 9 days. Most recently, Máster Ortodoncia UCM was updated on October 3, 2026 and VIIO on October 21, 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.*