# Denken 電験三種 Exam Prep — 1,280 past questions explained

> 1,280 past questions explained (iPhone/iPad app by StackWorks LLC.)

- Source: https://appshunter.io/ios/app/denken-exam-prep/id6799666772 (this page in markdown: same URL + `.md`)
- Developer: [StackWorks LLC](https://appshunter.io/developer/1833776593)
- Category: Education, Reference
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 143 MB
- Languages: Japanese
- Released: 2026-08-17
- Data updated: 2026-10-25

## What is Denken 電験三種 Exam Prep?

Prepare for Japan's Third-Class Chief Electrical Engineer examination (第三種電気主任技術者試験, "Denken 3"). The app is in Japanese.

- 16 sittings from 2015 to the first half of 2026: 1,280 published exam questions in Theory, Power, Machines and Regulations. Questions and figures are shown exactly as in the official booklets (circuit diagrams and formulas included), with pinch-to-zoom. Source: Electrical Technician Examination Center (電気技術者試験センター), https://www.shiken.or.jp/chief/third/qa/
- Every question has the key point, a detailed explanation and a reason for each wrong option; regulation questions are checked against current law and note later amendments
- Timed mock exams per subject (90 or 65 minutes) scored with the official points and each sitting's pass mark, including the choose-one questions 17/18
- A calculator with the functions allowed in the exam and a handwritten scratch pad
- Subject credit tracking: register passed subjects and see the remaining exemptions
- Practice by sitting, topic or question number; calculation-only or knowledge-only sets; review by mistake reason
- 239 formula and value flashcards with spaced repetition, and widgets for days left and a true-or-false question of the day

No account, no ads. Your study history stays on this device. Explanations are our own. The app does not represent any government body or the examining organization and is not affiliated with the Electrical Technician Examination Center.

Terms of Use: https://stackworksdev.github.io/denken-exam/terms.html
Privacy Policy: https://stackworksdev.github.io/denken-exam/privacy.html

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Pass Pack | $9.99 | one-time |


## Is Denken 電験三種 Exam Prep safe?

Not enough ratings yet to assess Denken 電験三種 Exam Prep.

## Is Denken 電験三種 Exam Prep legit?

Denken 電験三種 Exam Prep appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Denken 電験三種 Exam Prep is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 2.0.0 — 2026-10-23

A full rewrite: 16 sittings and 1,280 questions, timed mock exams per subject scored with official points, a calculator and scratch pad, question-number practice, updated regulation explanations, 239 flashcards and widgets. Your study history and Pass Pack carry over.

### 1.2 — 2026-09-03

・一部の問題で、本文が参照する図が設問画像に含まれず表示されない不具合を修正しました。

・一部の問題で、設問文の末尾に選択肢の続きや次の問題の見出しが混ざって表示される不具合を修正しました。

### 1.1 — 2026-09-02

全1,200問に解説を追加しました。問題文と図表の表示を改善し、学習コンテンツの品質を向上しました。

### 1.0 — 2026-08-17

No release notes.

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