ConceptDive: Listen Deeply

DreamMaker Studio

About this app

Free. No ads. No account. Works offline. No subscription and no locked features: speed, sleep timer, background playback and section repeat all work out of the box.

ConceptDive helps software engineers understand Android, Kotlin, JVM and architecture concepts deeply through listening, visual diagrams, and active recall — ideal for commutes, workouts, or interview prep. Built for developers who already know the basics.

Content on First Launch
• Tap "Download ConceptDive library" on the welcome screen to get 40+ articles in under a minute. The built-in library is written in Vietnamese; add any GitHub library for other languages.
• Every article follows the same structure: the problem that created it, the mechanism, trade-offs, common pitfalls, and self-check questions.
• References are listed at the end of each article, and the feedback button opens a GitHub issue for any mistake.

Listen Like a Podcast
• Each article is structured into sections; listen to the whole article or specific sections.
• Your position is saved to the second, even if the app is closed or a call comes in; resuming rewinds two seconds so you never miss a thought.
• Repeat a section three times or on a loop until it sticks.
• Works instantly with your device's built-in system text-to-speech engine — no downloads required.
• Optional on-device AI voices sound more natural: Vietnamese voices for Vietnamese articles and Supertonic 3 for English articles. The app tells you upfront whether your device can run them.
• Sleep timer, playback speed control, and background playback with the screen off.

View Diagrams & Active Recall
• Technical diagrams render cleanly alongside your reading and listening flow.
• Test your mental model with scenario-based active recall prompts after listening to ensure true understanding.

Your Content, Your Way
• Add libraries from any GitHub repository containing Markdown articles — public or private (read-only token). Select articles to import and sync updates anytime.
• Ask ChatGPT to draft articles on any topic: the app provides a fine-tuned prompt template. Tap "Send to ChatGPT", then copy or share back into ConceptDive. The app automatically detects incoming content.

Private & Offline-First
• No account, no ads, no tracking.
• All learning progress and notes stay strictly on your device; backup and restore anytime with a single file.
• On-device AI voice synthesis runs 100% locally with zero server communication.

Articles are not bundled in the app: the ConceptDive library and any other library download from GitHub, so new articles arrive without an app update.

What’s new

• Download the ConceptDive library in one tap from the welcome screen, with every article preselected.
• Playback remembers your spot to the second, even after you close the app.
• Section repeat: replay a section 3 times or on loop so it sticks.
• Each article lists its sources at the end; tap one to open it.
• New Supertonic 3 English voice for English articles, fully on-device.
• Fixes for audio playback and display issues.