Centum: Movie Shadowing
Watch It 100 Times
Free · Designed for iPad. Not verified for macOS.
Every language app hands you more content. Centum hands you one.
Centum is a tool for a single method: pick one film you love, and watch it a
hundred times — until the lines live in your mouth instead of your notebook.
THE FIVE STAGES
1 · Watch it once with no subtitles at all. Just enjoy it. You'll miss most of
it, and that's the point.
2 · Watch it with subtitles in your own language. Now you know the story cold.
3 · Watch it with English subtitles. Sound starts snapping onto spelling.
4 · Go line by line. Loop a single sentence, say it out loud, record yourself,
compare. Stay on a line until it's yours.
5 · Then watch — or just listen — for the remaining laps. Screen off, on the
train, doing the dishes. This is where the fluency actually gets built.
WHAT THE APP DOES
· Sentence looping — tap any line to loop it, frame-accurate, no drift.
· Shadow recording — hear the original, say it, hear yourself back, both drawn
side by side as waveforms.
· A lap count you can't fake — a lap only counts when the playhead really went
through: 1.5x speed or slower, 90% of the film or more, no scrubbing your way
to the end. Dragging the slider earns you nothing.
· A hundred squares — one per lap, shaded by the stage you were in. Watching
your film fill up is the whole point of the thing.
· Bilingual subtitles aligned by timecode, not by line number — two subtitle
files are almost never from the same release, and off-by-one alignment ruins
everything.
· Background listening with lock screen controls. Stage five is mostly ears.
· Notes and per-sentence mastery, so you can see which lines still aren't yours.
· Eight languages: English, 简体中文, 繁體中文, 日本語, 한국어, Español,
Français, Deutsch.
WHAT YOU NEED TO BRING
Centum ships with no films and no subtitles. It is a tool, not a library.
You bring:
· A video file in MP4 or MOV (H.264 or HEVC). MKV and AVI cannot be played on
iOS — this is a system limitation, not a setting.
· A subtitle file (.srt or .ass). One in English, plus optionally one in your
own language for stage two.
Without any subtitles you can still watch the film and count laps, but stages
two through four need them. Import your files through the Files app.
PRIVACY
No account. No sign-up. Nothing to log in to. Your films, your notes, your
recordings and your lap count live in this device's sandbox and go nowhere.
Delete the app and all of it is gone with it.
—
The method is 장동완's 100LS. The app is just the tool that makes it survivable.
Questions or ideas: business@zhidun-ai.com
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Centum 1.0.2 — fixes for watching a film all the way to the end.
· After a film ends, the play button starts the next lap. Until now the player froze at the end, and reopening the app dropped you straight back at that dead end.
· Lap counting is trustworthy again. A finished lap could be counted a second time when you came back to the film. It can't any more.
· The screen stays awake while a film is playing.
· Playback speed and the audio track you picked carry over into the next lap.
· iPad: the sentence list fills the panel instead of a quarter of it.
The developer, 北京智敦科技有限公司, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Beijing Zhidun Technology Co., Ltd.
- Size
- 3.7 MB
- Category
- Education
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - iPad
Requires iPadOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
English and 7 more
- English, French, German, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 Beijing Zhidun Technology Co., Ltd.