# Duet Display vs PLL Trainer

The clearest difference is rating: PLL Trainer at 5.0 against Duet Display's 4.4. PLL Trainer also leads on in-app purchases (none vs 6) and ads (none vs shown). Duet Display's advantage is update cadence (every 3 weeks vs every 6 months) and ratings volume (49K vs 3). On price there is nothing between them.

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

PLL Trainer holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: Duet Display has 49K ratings behind it against 3, so its average is the more settled of the two.

Duet Display ships an update every 3 weeks, PLL Trainer every 6 months. The most recent releases landed on November 5, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Duet Display | PLL Trainer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (49K ratings)](https://appshunter.io/ios/app/duet-display/id935754064/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/pll-trainer/id1595459897/reviews)** |
| Number of ratings | **49K** | 3 |
| Positive reviews | 45.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 6 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 59 MB | 26 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Vision Pro** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Duet, Inc.](https://appshunter.io/developer/935754063) | [Thomas Guilleminot](https://appshunter.io/developer/1185234015) |

## What reviewers say

### 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


### PLL Trainer

[App page](https://appshunter.io/ios/app/pll-trainer/id1595459897)

Improve your speed in recognizing PLL algorithms with this app. It offers a two-sided recognition trainer and allows you to select a specific color or train neutrally.

**Highlights:** PLL recognition trainer, Two-sided recognition, Color-specific training, Color neutral training, Fast algorithm recognition

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Duet Display free?

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

### Is PLL Trainer free?

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

### Which has better reviews, Duet Display or PLL Trainer?

PLL Trainer is rated higher. Duet Display averages 4.4 out of 5 from 49K ratings, while PLL Trainer averages 5.0 from 3 ratings.

### Do Duet Display or PLL Trainer have ads?

Duet Display shows ads; PLL Trainer does not.

### Which is updated more often, Duet Display or PLL Trainer?

Duet Display ships an update every 3 weeks, and PLL Trainer every 6 months. Most recently, Duet Display was updated on November 5, 2026 and PLL Trainer on November 3, 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.*