# Heavy Duty Mechanic Red Seal — Equipment Technician 421A Prep

> Equipment Technician 421A Prep (iPhone/iPad app by Ohad Westler.)

- Source: https://appshunter.io/ios/app/heavy-duty-mechanic-red-seal/id6811005759 (this page in markdown: same URL + `.md`)
- Developer: [Ohad Westler](https://appshunter.io/developer/6808539432)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.4 · 55 MB
- Languages: American English, French (France)
- Released: 2026-09-21
- Data updated: 2026-10-25

## What is Heavy Duty Mechanic Red Seal?

Heavy Duty Equipment Technician (HDET) Red Seal exam prep, including Ontario trade 421A, with 1,500+ English and Canadian French practice questions, full 135-question mock exams and six interactive diagnostic experiences containing 32 scored scenarios. Download free and try 50 practice questions and a 25-question sample mock exam; one C$19.99 in-app purchase unlocks the full bank, full mocks and advanced experiences. Practise the test sequence before replacing a component, not only multiple-choice recall. Earlier paid-download customers keep full access. No subscriptions, ads or account.

FULL ACCESS INCLUDES
• The complete bank of 1,500+ English and Canadian French questions
• Full 135-question mocks following the published task allocation
• Focused 10-question sessions across nine work areas
• Six interactive HDET experiences with 32 scored scenarios
• Clear feedback for your selected answer and every option
• Confidence, accuracy, pacing and repeat-performance insights
• Bookmarks, a mistake journal and private on-device progress

TRACE THE SYSTEM BEFORE REPLACING THE PART
Work a virtual diagnostic bay, animate hydraulic flow, place virtual multimeter leads, troubleshoot CAN-bus faults, follow a fail-closed high-voltage isolation sequence and inspect an original failure atlas. Each experience connects evidence, safety gates and the next useful test.

UNDERSTAND THE MISTAKE
See your selected choice beside the correct answer, read option-specific reasoning, add a private note and revisit weak areas through targeted practice. English and Canadian French are included throughout.

PRIVATE, OFFLINE AND YOURS
No account, no ads and no study-data sync. Optional usage statistics, off unless you allow them. Answers, bookmarks and progress stay on your device, and the full experience works offline after download.

Generative AI assists with some questions and explanations. It is not treated as an authority; content is checked against documented sources, but errors may remain. Verify safety-critical information with official sources and report suspected errors.

A Certloom Learning app. Independent study aid. Not affiliated with or endorsed by the Canadian Council of Directors of Apprenticeship or the Red Seal Program. Contains no recalled exam content and does not guarantee eligibility, score or success.

In Ontario, Heavy Duty Equipment Technician is trade 421A. Use this independent app to practise Red Seal topics, and check eligibility and certification requirements with Skilled Trades Ontario.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Full access | $14.99 | one-time |


## Is Heavy Duty Mechanic Red Seal safe?

Not enough ratings yet to assess Heavy Duty Mechanic Red Seal.

## Is Heavy Duty Mechanic Red Seal legit?

Heavy Duty Mechanic Red Seal appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Heavy Duty Mechanic Red Seal is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.2.8 — 2026-10-21

The quick readiness check now opens right after you set up your study plan, so you see where you stand sooner. You can still skip it and take it later from Home or Progress. Results from the check and from your first practice set now show your score and your weakest work areas. New: after your first practice set you can ask for one reminder to study again the next day. Studying still works fully offline.

### 1.2.7 — 2026-10-18

New: a quick readiness check. Answer 5 questions, each from a different work area, then see which areas went well and which one to review first. New learners see it once after setup, and anyone can take or retake it from Home or Progress. If you didn't mark any work areas as difficult in your study plan, the check now helps guide it. The check takes a few minutes and does not predict your exam result. Studying still works fully offline.

### 1.2.6 — 2026-10-17

New: a free Question of the Day on the Home screen, and your study reminders now point to it. An unfinished practice session now shows as a clear card that picks up where you left off. Settings has a Rate this app option and a Privacy section. The optional usage statistics choice now also covers crash reports. Both stay off unless you allow them. Studying still works fully offline.

### 1.2.5 — 2026-10-13

New: an optional choice to share usage statistics that help us improve the app. It is off unless you allow it, and you can change it any time in Settings. Studying still works fully offline.

### 1.2.4 — 2026-10-12

Updated App Store name and listing. Your questions, progress and purchases are unchanged.

## More apps by Ohad Westler

- [Millwright Red Seal Exam Prep](https://appshunter.io/ios/app/millwright-red-seal-exam-prep/id6808539430)
- [Machinist Red Seal Exam Prep](https://appshunter.io/ios/app/machinist-red-seal-exam-prep/id6809931072)
- [HVAC/R Red Seal Exam Prep](https://appshunter.io/ios/app/hvacr-red-seal-exam-prep/id6811006359)
- [Electrician Red Seal Exam Prep](https://appshunter.io/ios/app/electrician-red-seal-exam-prep/id6814186522)
- [TCF Canada Prep: NCLC Ready](https://appshunter.io/ios/app/tcf-canada-prep-nclc-ready/id6815303232)

All apps by Ohad Westler: https://appshunter.io/developer/6808539432

## Related topics

[heavy duty mechanic red seal](https://appshunter.io/ios/topics/heavy-duty-mechanic-red-seal)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*