DevPrep: Coding Interview
Swift & Obj-C interview Q&A
Free · In-App Purchases
New: prep for a specific company, a plan to your interview date, 800+ challenges, system design and behavioral. Everything works offline.
Prepare for your iOS developer interview with a plan — 5–10 minutes a day.
Hundreds of questions across 22 topics and 800+ interactive challenges — the library grows regularly: Swift, SwiftUI, Swift Concurrency (async/await, actors), Combine, memory & ARC, multithreading & GCD, UIKit, Auto Layout, architecture (MVVM, VIPER, Clean), Objective-C, algorithms & data structures, networking, testing and soft skills.
WHAT'S INSIDE
• Practice: 800+ challenges in 8 formats — what does it print, find the bug, assemble the code, pick the fix, fill in the blank, will it crash?, estimate the complexity, select all that apply — with hints, explanations, Easy / Medium / Hard difficulty and a personal feed that targets your weakest topics
• Company prep: interview stages at 24 tech companies based on public candidate reports, what candidates were asked, and a day-by-day plan up to your interview date
• Timed mock interviews, a weekly challenge, tracks and an activity calendar
• Mobile system design: 20 cases with step-by-step walkthroughs and self-checks
• Behavioral interviews: 46 questions, your own STAR stories and timed drills
• Today: what to review, what to learn next, a daily puzzle and your weak spots
• A prep roadmap for Junior, Middle and Senior — stages with must-know checklists
• Tasks from real interviews and “what does this code print” puzzles with full solutions
• Spaced-repetition trainer: missed cards come back in the same session
• Apple-docs-style answers with Swift 6 code and syntax highlighting
• A level filter across the whole library — study exactly what you need
• Progress by topic, a daily streak and goal
• Daily reminders and progress sync via iCloud
• Light and dark themes, Russian and English — switch on the fly
• Works fully offline — all content is saved on your device
• Optimized for iPhone Duo and iPad
We continuously update and expand the library of questions and tasks — new content arrives without an app update.
Basic topics are free. Full access to all questions, tasks and materials unlocks with a subscription.
SUBSCRIPTION
Payment is charged to your Apple ID at confirmation of purchase. It auto-renews unless auto-renew is turned off at least 24 hours before the end of the current period. Manage your subscription in your Apple ID settings. Terms of use and the privacy policy are available in the app.
Ratings & Reviews
- This app has not received enough ratings or reviews to display an overview.
A major Practice update:
• 800+ challenges and new topics: Swift basics, OOP, databases, Objective-C, iOS SDK
• New formats: fill in the blank, will it crash?, estimate the complexity, select all that apply
• A challenge catalog with filters and Easy / Medium / Hard difficulty, hints, bookmarks and notes
• Company prep: interview stages at 24 tech companies, what candidates were asked, and a day-by-day plan to your interview date with reminders
• 30-minute mock interviews — general or focused on a specific company's topics
• Mobile system design: 20 cases with step-by-step walkthroughs
• Behavioral interviews: questions, your own STAR stories and timed drills
• Weekly challenge, activity calendar and a shareable progress card
• 15 topic tracks
• Full offline mode: all content works without internet
The developer, Aliaksei Yelin, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Contact Info
- User Content
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Aliaksei Yelin
- Size
- 35.8 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 10.15 or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English and Russian
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Full Access · Lifetime USD 9.99
- Full Access · Year USD 4.99
- Full Access · Monthly USD 1.99
- Get full access USD 2.99
- Copyright
- © Aleksei Elin Dev.