CrystalEngine

Even if you don't know the name, one line from inside is enough

My phone has quietly become a drawer that won't open. Thousands of documents, songs, photos, and videos have piled up, yet the one thing I need is unfindable because I don't know its name. CrystalEngine finds it by what's inside the file, not by its filename. Ask your phone the way you'd ask Google, and open it right there where you found it — no account, no upload, 100% inside your own device.

Don't hunt — search

• Remember just one sentence from a document or one phrase from a note, and you'll find it. It indexes the contents of HWP, Office, PDF, and text files and points right to the matching sentence.
• Korean initial-consonant (chosung) search (ㅊㅇㅅㅊ), typo correction, search operators like type:hwp · before: · size:>10mb, and voice search for when your hands are full.
• Export results as a list — share or save the search-narrowed file list as text.
• Even 100,000 files in the blink of an eye (FTS5 index). The desktop had Spotlight — now your phone does too.

Hangul (Arae-a Hangul), right here on your phone

• Not only opens HWP, HWPX, Hancell, and Hanshow Korean documents but searches inside them too. And Word, Excel, PowerPoint, PDF, and legacy .doc — all in a single viewer, with formatting, tables, and images intact.
• In-document search, dark inversion, pinch zoom, and resume reading (close it and reopen right where you left off). The viewer safely handles malformed files, so the app won't hang.

Not just documents — music, photos, and video too

• Music player — rotating CD player, jog-wheel scrubbing, crossfade, silence skip, gapless, EQ, sleep timer, lyrics, and lock-screen control.
• Video player — playback speed, subtitles, brightness/volume gestures, PIP, and resume.
• Find similar photos — pick one and see lookalikes within a second (even among 10,000). Everything you've opened, listened to, and viewed is easy to retrace via Trail.

On-device by principle

• 0 data collection — indexes, search terms, and documents are never sent to a server.
• Offline first — works the same on a plane or with no network at all. No account, no login required.

Honest licensing

Public-key-signed licenses verify trials, subscriptions, and perpetual licenses offline. A license is bound permanently to the single device that created the request key, and one QR key is all it takes to issue it.

We'll give you back the time you spent searching.