EinkBro is a full-featured Android web browser specifically optimized for e-ink devices (Boox, Supernote, etc.). It is built on Kotlin with Jetpack Compose UI, Koin dependency injection, and Room for local SQLite storage. The browser provides a rich reading experience with reader mode, EPUB generation and reading, text-to-speech (system, Edge, OpenAI), paragraph-level translation (Google, DeepL, OpenAI, Gemini), vertical CJK reading, and extensive font/theme customization. It includes a native C++ ad-blocking engine (forked from Brave/ad-block) with Kotlin regex fallback, a Tampermonkey-compatible userscript engine, and per-site configuration overrides for JavaScript, CSS, dark mode, and desktop mode. The application integrates deeply with AI/LLM services (OpenAI, Gemini, self-hosted) for chat, summarization, translation, and an autonomous agent task system that can browse pages, run JavaScript, manage bookmarks, and persist DOM patches. It also supports cloud backup via Google Drive, YouTube caption fetching, dual captions, and a custom PDF/EPUB export pipeline. The architecture follows a delegate pattern to keep the main BrowserActivity manageable, with view models exposing StateFlow for Compose UI. The codebase is well-structured with extensive unit tests for preference serialization, ad-block rules, EPUB parsing, and AI API communication. While the feature surface is large and some integrations (Edge TTS, YouTube API) rely on reverse-engineered endpoints, the engineering quality is solid with reusable patterns like typed preference delegates, compose dialog fragments, and a windowed text access utility for LLM tools.