# QualityStudy vs Duet Display

The clearest difference is in-app purchases: QualityStudy at none against Duet Display's 6. QualityStudy also leads on ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Duet Display sells 6 in-app purchases, starting at $3.99 per month. QualityStudy asks for nothing beyond the download.

QualityStudy ships an update every 5 weeks, Duet Display every 3 weeks. The most recent releases landed on May 16, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | QualityStudy | Duet Display |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.4 (49K ratings)](https://appshunter.io/ios/app/duet-display/id935754064/reviews)** |
| Number of ratings | — | **49K** |
| Positive reviews | — | 45.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 18 MB | 69 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [UNICUS Co., Ltd.](https://appshunter.io/developer/295442842) | [Duet, Inc.](https://appshunter.io/developer/935754063) |

## What reviewers say

### QualityStudy

[App page](https://appshunter.io/ios/app/qualitystudy/id767125531)

**Features:** macOS Compatibility

**In-app purchases:** none


### Duet Display

[App page](https://appshunter.io/ios/app/duet-display/id935754064)

Transform your iPad or iPhone into an advanced, lag-free extra display for your Mac or PC. Interact with your computer using touch and gestures, and unlock professional drawing capabilities with Apple Pencil support.

**Highlights:** Extra display for Mac & PC, Lag-free performance, Touch and gesture support, Apple Pencil integration, Professional drawing tools, Portable productivity

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Duet Starter (Monthly) | $3.99 | per month |
| Duet Air (Monthly) | $5.99 | per month |
| Duet Pro | $7.99 | per month |
| Duet Starter (Annual) | $39.99 | per year |
| Duet Air (Annual) | $49.99 | per year |
| Duet Pro (Annual) | $79.99 | per year |

**What reviewers like**

- 🚀 Works seamlessly as a second screen
- 👍 Useful for productivity and multitasking
- 🎨 Great for artists and designers
- 💻 Extends desktop to iPad
- ⭐ Excellent customer support

**What reviewers complain about**

- 🐛 Connectivity issues and crashes
- 🔋 High battery consumption
- 🔒 Subscription model for full functionality
- 🔍 Confusing setup process
- 💸 Expensive for the features provided

**Reported bugs**

- Incompatibility with certain software and drivers
- Laggy performance and input delays
- Unreliable connection and frequent disconnects

**Requested features**

- Improved resolution and scaling options
- Better support for older devices and Windows
- More customization and control over settings
- Wireless connectivity without subscription


## Frequently asked questions

### Is QualityStudy free?

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

### Is Duet Display free?

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

### Do QualityStudy or Duet Display have ads?

Duet Display shows ads; QualityStudy does not.

### Which is updated more often, QualityStudy or Duet Display?

QualityStudy ships an update every 5 weeks, and Duet Display every 3 weeks. Most recently, QualityStudy was updated on May 16, 2026 and Duet Display on September 25, 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.*