# Stack Trainer vs DeviceShelf

The clearest difference is price: DeviceShelf at Free against Stack Trainer's $3.99. DeviceShelf also leads on update cadence (every 3 days vs every 3 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

DeviceShelf is free to download; Stack Trainer costs $3.99 up front. Stack Trainer sells 2 in-app purchases, starting at $1.99 per 3 months and DeviceShelf sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Stack Trainer ships an update every 3 months, DeviceShelf every 3 days. The most recent releases landed on August 28, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | Stack Trainer | DeviceShelf |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/stack-trainer/id646458442/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 days** |
| Monetization | Subscription | — |
| Size | 6 MB | 27 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ralph Cos](https://appshunter.io/developer/573505028) | [Christof Müller](https://appshunter.io/developer/987990115) |

## What reviewers say

### Stack Trainer

[App page](https://appshunter.io/ios/app/stack-trainer/id646458442)

This app provides a realistic card deck experience for close-up magicians to train their memory of card stacks. It offers various challenge modes and filters to aid learning and practice, with a focus on a clean, distraction-free interface.

**Highlights:** Realistic card deck simulation, Multiple mnemonic training approaches, Customizable stack filters, Lorrayne's peg words integration, Interactive quick-touch analyzer, Display and whisper modes

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 3 Months Subscription | $1.99 | per 3 months |
| Annual Subscription | $2.99 | per year |


### DeviceShelf

[App page](https://appshunter.io/ios/app/deviceshelf/id6779666567)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DeviceShelf Mobile | $17.99 | one-time |
| DeviceShelf Complete Upgrade | $34.99 | one-time |
| DeviceShelf Complete | $49.99 | one-time |


## Frequently asked questions

### Is Stack Trainer free?

Stack Trainer costs $3.99, and also offers in-app purchases.

### Is DeviceShelf free?

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

### Do Stack Trainer or DeviceShelf have ads?

Neither Stack Trainer nor DeviceShelf shows ads.

### Which is updated more often, Stack Trainer or DeviceShelf?

Stack Trainer ships an update every 3 months, and DeviceShelf every 3 days. Most recently, Stack Trainer was updated on August 28, 2026 and DeviceShelf on September 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*