# Stack Trainer vs The EOOW & ETO Bible

The clearest difference is review sentiment: The EOOW & ETO Bible at 100% against Stack Trainer's 67%. The EOOW & ETO Bible also leads on iOS requirement (15.1 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Stack Trainer sells 1 one-off in-app purchase and The EOOW & ETO Bible sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

Stack Trainer ships an update every 5 days, The EOOW & ETO Bible weekly. The most recent releases landed on October 2, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Stack Trainer | The EOOW & ETO Bible |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/stack-trainer/id6760936559/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 5 days** | Weekly |
| Monetization | Free with in-app purchases | Freemium |
| Size | 115 MB | 66 MB |
| Requires iOS | 17.6 | **15.1** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wayne Borcher](https://appshunter.io/developer/1886925894) | [Azimuth Systems Ltd](https://appshunter.io/developer/1883659138) |

## What reviewers say

### Stack Trainer

[App page](https://appshunter.io/ios/app/stack-trainer/id6760936559)

This app helps magicians memorize and recall card stacks with gamified drills and performance scenarios. It offers various practice modes to build speed, accuracy, and long-term retention of memorized decks.

**Highlights:** Gamified daily drills, Memorized deck recall training, Multiple practice modes, Performance tracking, Awards and personal bests, Apple Watch practice

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stack Trainer Pro | $9.99 | one-time |


### The EOOW & ETO Bible

[App page](https://appshunter.io/ios/app/the-eoow-and-eto-bible/id6783911576)

Prepare for MCA Engineer Officer of the Watch and Electro-Technical Officer exams with this comprehensive study tool. It offers structured modules, an AI oral exam simulator, and spaced-repetition flashcards to help you master the STCW syllabus and track your progress.

**Highlights:** STCW A-III/1 and A-III/6 syllabus coverage, AI oral exam simulator with spoken answer feedback, Spaced-repetition flashcard engine, Timed mock exams and practice questions, Per-topic accuracy tracking, Offline core content access, Progress tracking with dashboards and ranks

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Annual | $39.99 | per year |


## Frequently asked questions

### Is Stack Trainer free?

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

### Is The EOOW & ETO Bible free?

The EOOW & ETO Bible is free to download, with in-app purchases available.

### Do Stack Trainer or The EOOW & ETO Bible have ads?

Neither Stack Trainer nor The EOOW & ETO Bible shows ads.

### Which is updated more often, Stack Trainer or The EOOW & ETO Bible?

Stack Trainer ships an update every 5 days, and The EOOW & ETO Bible weekly. Most recently, Stack Trainer was updated on October 2, 2026 and The EOOW & ETO Bible on September 29, 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.*