DevPrep: Coding Interview
iOS & Swift: a challenge a day
Free · In-App Purchases
Now on Mac: the same reference, challenges and AI-assisted development as on iPhone and iPad. One subscription across devices, progress synced via iCloud.
Prepare for your iOS developer interview with a plan — 5–10 minutes a day.
Hundreds of questions across 20+ topics and 900+ 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: 900+ challenges in 9 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, is this API real? — with hints, explanations, Easy / Medium / Hard difficulty and a personal feed that targets your weakest topics
• AI-assisted development: review AI-generated code, spot made-up and deprecated APIs, prompts and context, theory and ready-made project rule templates — ship code with AI faster and with confidence
• Company prep: interview stages at 24 tech companies based on public candidate reports, what candidates were asked, a day-by-day plan up to your interview date — and you can share your own questions
• 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 brand-new DevPrep for Mac — the same app as on iPhone and iPad:
• Practice: 1,100+ challenges in 10 formats, checked by the compiler, with explanations
• AI-assisted development: AI code review, made-up APIs, prompts, 42 articles on AI fundamentals
• Company prep: interview stages at 24 companies and a day-by-day plan
• Mobile system design, behavioral interviews, mock interviews
• 480+ reference articles and a spaced-repetition trainer
• Works offline; subscription and progress shared with iPhone and iPad
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 Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Purchases
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Purchases
- Contact Info
- User Content
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Provider
- Aliaksei Yelin
- Size
- 21.4 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 14.0 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 99,900.00 TZS
- Full Access · Year 89,900.00 TZS
- Full Access · Monthly 14,900.00 TZS
- Get full access 6,900.00 TZS
- Copyright
- © Aleksei Elin Dev.