# CodeStudy: AI Coding Tutor — Swift · Spring · Kotlin tutor

> Swift · Spring · Kotlin tutor (iPhone/iPad app by ByeongYun In.)

- Source: https://appshunter.io/ios/app/codestudy/id6762127373 (this page in markdown: same URL + `.md`)
- Developer: [ByeongYun In](https://appshunter.io/developer/1632990861)
- Category: Education, Productivity
- Price: Free
- Age rating: 4+
- Requires: iOS 18.0 · 4 MB
- Languages: American English, Korean
- Released: 2026-04-17
- Data updated: 2026-05-07
- User reviews in markdown: https://appshunter.io/ios/app/codestudy/id6762127373/reviews.md

## What is CodeStudy?

ChatGPT gives you answers and you forget them an hour later.
Tutorials are fun until you can't recall a thing.
CodeStudy makes you make the answer — and remember it.

CodeStudy is an AI coding tutor that teaches with the Socratic method. Instead of dumping code on you, it asks the right questions until you figure it out yourself. The "aha" moment is yours, not the AI's. That's why it sticks.

Pick your track:
• Swift / iOS — for app developers
• Spring / Kotlin — for backend developers

Both tracks ship with 50 hand-crafted concepts and the same Socratic dialogue engine. Switch tracks anytime in Settings.

— How it works —

You pick one concept (Optionals, SwiftUI State, Kotlin null safety, JPA transactions…) and have a real conversation with the tutor. It probes your understanding, gives analogies, asks you to predict what code does. When you've actually got it, it marks the concept "Mastered" — and only then.

No multiple-choice. No copy-paste. No "great job!" filler. Just genuine back-and-forth until the idea clicks.

— What's in each track —

Swift / iOS (50 concepts)
Variables, Optionals, Closures, Protocols, Generics, async/await, SwiftUI state, Concurrency, Macros, and more.

Spring / Kotlin (50 concepts)
val/var, null safety, data classes, Coroutines, Spring Boot DI, JPA, transactions, REST design, large-scale system patterns, and more.

— Features —

• 100+ concepts across two tracks (50 per track)
• Daily learning rhythm with streaks
• Streak Shield — skip a day, your streak survives
• Track-scoped study history — revisit any mastered concept and replay your conversations
• Mastery tracking that actually means something (not "you saw it once")
• Localized for Korean and English
• Anonymous by default — no account, no email, just learn
• Open privacy practices — see PRIVACY.md in our repo

— Who is it for? —

iOS developers learning Swift seriously. Backend developers working with Spring/Kotlin. Bootcamp graduates filling conceptual gaps. Self-taught coders who keep getting stuck on the same things. Anyone tired of tutorials they forget by next week.

— What's not in CodeStudy —

No trackers. No analytics SDKs. No ads. No upselling. Just the tutor.

— Built by —

A solo developer who got frustrated with how today's coding tools optimize for the wrong thing (giving answers fast). CodeStudy optimizes for what actually matters: long-term retention.

Try it. Pick a track. Master your first concept in 5 minutes. The dialogue is the lesson.


## Version history (last 4 releases)

### 1.2.1 — 2026-05-04

A smoother experience for English-speaking learners.

• Tapping "Simpler", "Hint", or "Quiz me" in chat now sends prompts in English correctly — so your AI tutor responds naturally in your language, not Korean.
• Minor stability improvements.

### 1.2.0 — 2026-04-27

- Multi-track learning
CodeStudy is no longer Swift-only. Pick your stack:
• Swift / iOS — 50 concepts from Optionals to Concurrency
• Spring / Kotlin — 50 concepts from null safety to JPA

Switch tracks anytime in Settings. Same Socratic dialogue, your stack.

- Track-scoped history
Your study journey, sessions, and stats are now scoped per track. Switch tracks without losing your previous progress.

- Plus all 1.1.0 improvements
• Revisit any mastered concept's full study journey
• Streak shield — skip a day, your streak survives
• Full English support

### 1.0.1 — 2026-04-22

작은 개선이 모여 더 부드러운 학습 경험을 만들어요!

• 이미지로 저장 기능 추가
• 공유 / 다크모드 / 키보드 관련 버그 수정

### 1.0 — 2026-04-18

No release notes.

## More apps by ByeongYun In

- [MiTamin](https://appshunter.io/ios/app/mitamin/id6444240698)

All apps by ByeongYun In: https://appshunter.io/developer/1632990861

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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 2026-05-07.*