CodeStudy vs NerLan

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.

NerLan is a podcast player built for people learning a language by listening. Subscribe to any show by pasting an Apple Podcasts link or an RSS address, then play it with the controls a learner actually needs: variable speed from 0.5x to 2x, repeat one or repeat all, precise skip, and a lock screen and Control Center that move between episodes rather than nudging fifteen seconds at a time. Then study what you heard. TRANSCRIPTS THAT FOLLOW ALONG Generate a transcript of any episode and the sentence being spoken stays highlighted and centred as the audio plays. Tap a line to jump straight to it, or loop a single sentence until it sticks. TRANSLATION Render the transcript into your language, sentence by sentence, and read it alongside the original. Generated once and kept, so re-reading costs nothing. STUDY HANDOUTS Turn an episode into a review sheet - overview, grammar points, example sentences, and vocabulary - drawn from its own transcript. Examples stay in the language you are studying, glossed in the language you choose. SHADOWING PRACTICE Loop a sentence, record yourself reading it aloud, and play your version back against the original. LISTEN OFFLINE Download episodes for the commute, or let anything you stream to the end be kept automatically. Downloads are grouped by show and language, filterable, and available with no signal. WIDGETS Up Next, Latest Episode, My Shows, and a listening-streak widget for the Home and Lock Screen - all playable without opening the app. SIRI "Play [show] in NerLan", resume where you left off, change the speed, or ask how long you have listened this week. Give a show a nickname Siri can actually hear when its real title is in a script Siri does not speak. YOUR AI, YOUR CHOICE AI features are optional and run on credentials you provide - either an OpenAI API key billed to your own account, or your own OpenAI-compatible server, including one on your own machine. Your key is kept in the device keychain. PRIVATE BY CONSTRUCTION No account, no sign-up, no analytics, no advertising, no tracking, and no third-party SDKs. There is no NerLan server, so there is nowhere for your listening to be sent. Optional iCloud sync writes to your own account so your library survives a reinstall; audio is never synced. NerLan plays podcasts from their own public feeds. All audio content belongs to its publishers.