Comparison

Stack Trainer vs The EOOW & ETO Bible

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Stack Trainer

Enhance your memorized deck skills with daily practice sessions. This app offers guided learning for card sequences, detailed progress tracking, and various training modes to improve recall and fluency. It's designed for magicians to master their decks efficiently.

Highlights
  • Daily practice sessions
  • Guided PAO learning course
  • Card-to-position and position-to-card recall
  • Speed and accuracy training modes
  • Progress tracking with focus cards
  • Support for iPhone, iPad, and Apple Watch
Features
Read full description

Learn your memorized deck, then keep it sharp with a few minutes of practice a day. Practicing Mnemonica is free. Stack Trainer is built for magicians who use a memorized deck. Practice daily, build a streak, and see exactly which cards are slipping, so every session goes where it's needed. PRACTICE EVERY DAY - Short, focused sessions that fit into any day - Streaks, reminders and a Habit Tracker that shows every session at a glance - Awards and Personal Bests to mark your progress LEARN MNEMONICA CARD BY CARD A guided PAO course teaches each card with a vivid Person, Action and Object, then tests you both ways: card to position and position to card. A step-by-step plan takes you through all 52, followed by spaced reviews so the stack stays solid. The first 5 cards are free. Pro unlocks the full course. WAYS TO TRAIN CORE RECALL - Recall Quiz: card to position, position to card, next and previous card STACK FLUENCY - Matchup and 4 of a Kind: speed and accuracy against the clock - Stack Segments: master the deck in small groups, then expand - Grid Rebuild: put the full deck back in stack order in a grid - Fan Rebuild: put the full deck back in stack order in a card fan - Stack Trail (Pro): trace runs of cards in stack order PRACTICAL STACK WORK - ACAAN: find any card at any number - Improv (Pro): realistic cut, count and spell scenarios SEE WHAT TO WORK ON A 52-card map shows your strong and weak cards. Track accuracy, recall time and progress, and let Focus Cards bring back the cards that need more work. IPHONE, IPAD AND APPLE WATCH Train on iPhone, use the full-screen layout on iPad, and run quick recall drills on Apple Watch. Your Watch results sync with iPhone. FREE - Mnemonica practice in every mode except Improv - The first 5 cards of the PAO course - Streaks, Habit Tracker, Awards, Personal Bests and stats PRO: ONE-TIME UNLOCK - The full Mnemonica PAO course and learning plan - More stacks: Aronson, Redford, Particle System, Memorandum, Nikola Card System and Joyal - Build and train your own custom stack - Improv mode - Adaptive Focus Cards that prioritize your weakest cards - Notes and photos for each card - iCloud sync, backup and restore - Future Pro features No subscription. No ads. One purchase. Train daily. Build fluency. Know your stack.

About

The EOOW & ETO Bible

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
Read full description

The complete study companion for marine engineers preparing for the MCA Engineer Officer of the Watch (EOOW) and Electro-Technical Officer (ETO) Certificates of Competence. Built around the STCW A-III/1 and A-III/6 syllabus and MCA MIN 654, The EOOW & ETO Bible turns months of scattered notes, textbooks and past papers into one focused, structured course that fits in your pocket — onboard, ashore or at the academy. WHO IT'S FOR • Cadets and trainee engineers working toward EOOW • Electro-Technical Officers preparing for the ETO CoC • Qualified engineers refreshing before orals or revalidation CHOOSE YOUR PATH Pick EOOW or ETO when you sign up and your syllabus adapts to you. The core modules for your certificate sit front and centre, with every other engineering topic available as additional study whenever you want it. Switch roles any time. 12 COMPLETE MODULES Marine Diesel Engines · Marine Boilers & Steam · Auxiliary Machinery · Marine Electrical Systems · Automation & Control · Refrigeration & Air Conditioning · Naval Architecture & Stability · Safety & Firefighting · Environmental Compliance (MARPOL) · Watchkeeping & ER Management · High Voltage Systems · Electronics, PLCs & Navigation Systems PART B ORAL SIMULATOR Rehearse the oral exam with an AI examiner that asks realistic scenario questions, listens to your spoken answers and gives instant, constructive feedback — so you walk into the real thing calm and prepared. FLASHCARDS THAT KNOW WHAT YOU FORGET A proven spaced-repetition engine schedules every card at just the right moment, so your revision time goes to what you're about to forget — not what you already know. MOCK EXAMS & QUICK REVISION • Timed mock exams that mirror the real Part A format • Hundreds of practice questions across all five question types • Per-topic accuracy tracking that surfaces your weak areas • Quick Reference cards for pump troubleshooting, MARPOL limits, fuel treatment and more TRACK YOUR PROGRESS Watch your knowledge grow with clear dashboards, streaks and engineering ranks — from Motorman all the way to Chief Engineer. STUDY ANYWHERE Core content works offline, so a weak signal at sea is never an excuse to stop revising. START FREE The Marine Electrical Systems module is completely free. Unlock all 12 modules, the full oral simulator and unlimited mock exams with Premium. SUBSCRIPTION EOOW & ETO Bible Premium is available as a monthly or annual auto-renewing subscription. • Payment is charged to your Apple ID at confirmation of purchase • The subscription renews automatically unless cancelled at least 24 hours before the end of the current period • Manage or cancel any time in your App Store account settings Terms of Use: https://azimuthsystemsltd.co.uk/terms-of-service Privacy Policy: https://azimuthsystemsltd.co.uk/privacy-policy The EOOW & ETO Bible is an independent study aid. It is not affiliated with, endorsed by or sponsored by the Maritime and Coastguard Agency (MCA) or any certifying body. Always study alongside official MCA publications and the current regulations.

Screenshots

Stack Trainer4 screens
The EOOW & ETO Bible4 screens

Verdict

The call

The clearest difference is review sentiment: The EOOW & ETO Bible at 100% against Stack Trainer's 71%. 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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

Stack Trainer ships an update every 5 days, The EOOW & ETO Bible weekly. Both last shipped on October 31, 2026.

Scorecard2 real differences · 8 level
Stack Trainer versus The EOOW & ETO Bible: the parameters behind the verdict, then further details
ParameterStack TrainerThe EOOW & ETO Bible
PriceFreeFree
Rating4.5 (8 ratings) — better—
Positive reviews71.4% of reviews100.0% of reviews — better
Number of ratings8 — better—
Update frequencyEvery 5 days — betterWeekly
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFreemium
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS17.615.1 — better
Further details — not scored
Size124 MB66 MB
Age rating4+4+
DeveloperWayne BorcherAzimuth Systems Ltd

Customer experience

Stack Trainer

All ratings8 ratings
Positive75.0%
Neutral25.0%
Negative0.0%
Written reviews7 reviews
Positive71.4%
Neutral28.6%
Negative0.0%

The EOOW & ETO Bible

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

Stack Trainer

One-time1
  • Stack Trainer Pro$19.99
2 purchases

The EOOW & ETO Bible

Subscriptions2
  • Premium Monthly7 Days trial$4.991 Month
  • Premium Annual7 Days trial$39.991 Year

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 31, 2026 and The EOOW & ETO Bible on October 31, 2026.

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