Decode in context
Every line gets readings, word meanings, and grammar roles. Study while watching or reading, without leaving the app.
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How it works
A simple loop for steady comprehension gains
Import subtitles and video from what you watch. Each step builds on the last.
Retain what matters
Save lines you want to remember. A gentle review system brings them back without the guilt of a growing backlog. Review with high-quality speech synthesis or audio clipped directly from your content.
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Bridge into harder content
Generate short stories at your level that introduce the vocabulary and grammar from what you're watching. Each one prepares you to understand a little more.
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Study modes
Two study modes, one learning flow
A video player built for immersion
Watch, align subtitles, inspect lines, and save what matters without leaving the player.
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A reader built for comprehension
Read sentence-by-sentence with analysis visible so you can focus on understanding, not context switching.
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Pricing
The core of Katarineko is free forever. Not a trial, not a freemium tease. Pro only adds story generation.
Free forever
$0
No account needed. No limits.
- Subtitle import & parsing
- Word-level analysis with readings
- Grammar role breakdowns
- Video player with subtitle sync
- Reading mode
- Spaced review with gentle scheduling
- Export to Anki
Pro
$9.99/mo
or $79.99/yr
- Everything in Free
- Generated bridge stories tailored to your level and content
- Stories you generate are yours to keep, even if you cancel
Built for focused study on Mac
A native macOS app that respects your time and your data.
- Native SwiftUI — fast, light, no Electron
- Works offline after initial setup
- No analytics or ad tracking SDKs
- Your data stays on your device
- Clear privacy policy and terms of service