1secDic: Offline AI Dictionary

1secDic: Offline AI Dictionary & Flashcard Companion.

Meet 1secDic—the next-generation dictionary crafted for serious language learners, polyglots, and researchers. By fusing offline authoritative dictionary archives with the reasoning power of Apple Intelligence, 1secDic doesn't just define words—it helps you truly understand and master them.

Search across massive collections in an instant without an internet connection, ask on-device AI to explain subtle nuances, and turn your discoveries into active-recall flashcard study sessions.

Key Features:

- Offline-First Architecture & Private On-Device AI:
Core dictionary lookups across your EPWING and MDict collections work completely offline. Apple Intelligence runs privately on-device for instant nuance breakdowns and example dialogues—with zero data tracking. Need deeper etymology or 32K context? Seamlessly tap to refresh via Apple's Private Cloud Compute on demand.

- Interactive Flashcard Quiz Mode:
Never forget a word again. Seamlessly convert your bookmarks and search history into active-recall study decks. Features fluid 3D card flips, auto-scrolling marquee cards for comprehensive definitions, and an intuitive spaced repetition workflow ("Keep" vs. "Got It").

- Blazing-Fast Zero-Latency Engine:
Engineered in C++ and Swift for instant responsiveness. Decoded in-memory heading caches deliver 300ms live typing results across dozens of dictionaries simultaneously—with zero seek lag.

- Complete Format Freedom (EPWING & MDict):
Import your own EPWING and MDict (.mdx/.mdd) archives with ease, or get started immediately with free built-in downloadable dictionaries. Full support for subbooks, multi-book simultaneous search, embedded audio, and rare Kanji / Gaiji rendering.

- Retro Electronic Dictionary Aesthetics:
Relive the golden age of dedicated electronic dictionaries. Choose from authentic Green CRT, Plasma Amber, Blue Workstation, LCD, or E-Ink display styles, paired with custom bitmap typography (EtchedUD font) and subtle scanlines.

- Unified Apple Ecosystem:
Native apps crafted for iOS, iPadOS, macOS, and Apple Watch. Synchronize your bookmarks and history effortlessly across all your devices via iCloud.

*Note on Apple Intelligence: AI features run on-device and require iOS 26+ / macOS 26+ on compatible Apple Silicon hardware (iPhone 15 Pro, iPhone 16 series, or M-series Macs/iPads). On other devices, all offline dictionary lookups, EPWING/MDict archives, audio, flashcards, and retro themes remain fully operational.*