SkillStack - スキマ時間でIT資格合格

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About this app

Pass your IT certification exams even when you're busy.
SkillStack is an IT certification exam preparation app specifically designed for "spare time" during commutes, breaks, and before bed.

It covers over 86 certifications and 23,000 questions, from national certifications to AWS, Azure, and Google Cloud, all in one app.

21 certifications, including IT Passport, G-Test, Statistics Certification Level 3, and AWS CLF, are fully covered and available for free.

"I can't find enough time to study," "I can't stick with thick textbooks."

Even if you're busy like that, you can aim for success efficiently with just 5 minutes of spare time each day.

Why can you pass in such a short time?

Because AI analyzes your weaknesses and presents only the questions you should be solving right now.

It eliminates wasted time on irrelevant questions and guides you to success via the shortest route.

Start learning now without registration.

You can create an account after you like it.

■ Three Reasons Why You Can Pass in Your Spare Time

【1. Start with Just One Question Immediately】
Restart your studies the moment you open the app, whether on your commute or during a break.
Don't waste a single second of your spare time.

【2. AI Suggests Only the Problems You Should Do Today】
The AI ​​analyzes your answer history and automatically identifies your weak areas.
You can focus your limited time on the most effective problems.

【3. AI Explains Why You Made Mistakes】
Ask the AI ​​about problems you don't understand. It provides clear explanations, including related knowledge, so you can deepen your understanding even in a short time.

■ Supports Over 86 Qualifications and 23,000 Questions in One App

No need to buy separate study materials for each qualification.

[National Qualifications (Information Technology Engineer Examination)]
・IT Passport (All questions free) / Fundamental Information Technology Engineer / Applied Information Technology Engineer

[AWS Certifications (12 certifications)]
・CLF / AIF (Completely free)
・SAA / DVA / CloudOps (formerly SOA) / DEA / MLA
・SAP / DOP / ANS / SCS / Generative AI Developer

[Google Cloud Certifications (14 certifications)]
・Digital Leader / Generative AI Leader (Completely free)
・Associate Cloud Engineer / Associate Data Practitioner / Google Workspace Administrator
・Professional certifications (Cloud Architect / Data Engineer / ML Engineer / Cloud Developer / Cloud Network / Cloud Security / Security Operations / Cloud DevOps / Cloud Database)

[Microsoft Certifications (12 certifications)]
・AZ-900 / AI-900 / DP-900 / PL-900 / SC-900 / Copilot & Agent Administration (Completely free)
・AZ-104 / AZ-305 / MD-102 / DP-300 / PL-300 / SQL AI Developer

【Network / Linux / Containers】
• Cisco CCST Networking (Completely Free) / CCNA / CCNP Enterprise (ENCOR, ENARSI, ENSLD, ENSDWI)
• LinuC Level 1-4 / LPIC-1
• Kubernetes KCNA (Completely Free) / CKA / CKAD / CKS

【Development / Databases】
• Java (Bronze / Silver / Gold)
• Python (Engineer Certification: Fundamentals, Data Analysis, Practical / Programming Ability Certification: Levels 1-3)
• ORACLE MASTER Bronze, Silver, Gold DBA / OSS-DB Silver, Gold

【AI / Data Science / Security】
• G-Test / E-Certification / Generative AI Passport
• Data Scientist Certification / Statistics Certification (Levels 3-1, Pre-1, Data Science Fundamentals-Expert) / Statistical Surveyor, Professional Statistical Surveyor
• ISC2 Certified in Cybersecurity (CC)

■ 21 Certifications: All Content Free

You can study for all of the following certifications for free without registering:

* National Certification: IT Passport
* Cloud Introduction: AWS CLF/AIF / AZ-900/AI-900/DP-900/PL-900/SC-900/Copilot & Agent Administration / Google Cloud Digital Leader/Generative AI Leader
* AI/Data: G-Test / Generative AI Passport / Statistics Certification Level 3
* Development/DB: Java Bronze / Python3 Engineer Certification Basic / Python Programming Proficiency Certification Level 3 / ORACLE MASTER Bronze DBA
* Infrastructure/Security: Cisco CCST Networking / Kubernetes KCNA / ISC2 CC

You can start by building a foundation with free certifications before stepping up to higher-level certifications.

You can also try the first set of practice questions for other certifications for free.

■ Recommended for:

* Busy working professionals who can't find dedicated study time
* Those who want to study efficiently by utilizing commutes and spare time
* Those who find thick textbooks insufficient
* Those who want to challenge themselves with IT certifications but don't know where to start
* Those who want to identify their weaknesses and focus their efforts on those areas

■ Main Features

【Problem Practice by Subject and Year】
Practice a wealth of problems categorized by subject and year.
Learn quickly during spare time.

【AI Weakness Analysis】
AI analyzes your answer history to instantly identify your weak areas.
Use your limited time efficiently.

【Today's Recommendation】
AI suggests problems to solve today based on your learning progress.

【Passing Ability Score & Learning Report】
Visualize your abilities with a score from 0 to 100.
See your retention rate, subject-specific performance, and mock exam progress at a glance.

【Ask the AI】
Ask the AI ​​questions you don't understand. It will explain why that answer is correct, including related knowledge.

[AI-Based Scoring]
Essay questions are also scored and feedback is provided by AI.
This allows for practice in the actual exam format.

[Mock Exam]
Check your abilities with a mock exam that closely resembles the real thing.
Ideal for practicing time management.

[Questions to Review]
Review difficult questions and questions that you haven't yet mastered.
Avoid repeating the same mistakes.

[Flashcards]
Quickly check vocabulary during spare time.

[Learning Continuation Support]
Set an exam date and count down. Records consecutive learning days and provides reminder notifications to support your daily learning habit.

■ Pricing Plans

【Free】
・All content for 21 certifications (IT Passport, AWS CLF/AIF, G-Test, AZ-900, etc.)
・Free access to the first question set for other certifications
・AI function (5 credits per month, 10 credits for the first month)

【Premium Monthly Plan】
・All certifications and question sets unlocked
・Unlimited use of mock exams and filtered learning
・AI function 80 credits per month

【Premium 3 Months】
・Approximately 9% cheaper than the monthly plan
・AI function 90 credits per month

【Premium Annual Plan】
・Monthly features plus 100 credits per month
・Save the equivalent of 2 months

Individual AI credit packs are also available for purchase.
Please check the pricing plan screen within the app for the latest prices.

■ Safe and Secure Use

・No registration required, start immediately
・Purchase recovery supported (peace of mind even after changing devices or reinstalling)
・Account deletion is possible at any time

Start for free and find the learning style that suits you.

Make the most of your spare time and achieve IT certification success with SkillStack.
AI x Problem-Solving Practice to Analyze Your Weaknesses, 5 Minutes a Day for Exam Preparation
Updated on
Sep 18, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Personal info, Financial info and 3 others
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

SkillStack アップデート

【不具合の修正】
・選択肢が図になっている問題で、図が表示されず解答できなかった不具合を修正しました
・途中まで解いた問題集を開き直すと、「続きから」「最初から」を選んでも問題に進めなかった不具合を修正しました
・記述式の問題で、模範解答どおりに入力しても不正解と判定される場合があった不具合を修正しました
・画像のない問題に「画像を読み込めません」と表示される場合があった不具合を修正しました

【改善】
・はじめに目指す資格を選ぶと、すぐにその資格の問題から始められるようにしました
・毎日の学習が5日以上続くと、アプリを開いたときに連続記録をお知らせします
・AI苦手分析に「あと何問で使えるか」の表示を追加しました
・クレジット不足などのとき、理由が分かるメッセージを表示するようにしました

引き続き SkillStack をよろしくお願いします。
Content rating
Everyone
In-App Purchases
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App support

About the developer
MINATRY
support@skillstack.jp
3-9-408, SHIMIZUCHO TONDABAYASHI, 大阪府 584-0034 Japan
+81 70-8469-6633