Track your Japanese immersion. Automatically.
A browser extension that counts your streaming time on YouTube, Netflix, Crunchyroll, and more. Free, private, no setup.
You're already tracking. A free account syncs your data across devices, unlocks the leaderboard, and gives you detailed analytics.
Chrome
Firefox
Also available on Android (Firefox)
Sync your data, join leaderboards, see analytics.
What jp343 does for you
A browser extension and a website working together. Track time, see progress, join the community.
Japanese Feed Filter
Clean up your YouTube feed with one click. Hide non-Japanese recommendations and stay focused on immersion content.
- Before/After with one toggle
- Works on homepage, sidebar, search
- No distractions, only Japanese
Your Personal Dashboard
See your total immersion time, daily streaks, weekly stats, and activity heatmaps. Upload a custom background to make it yours.
- Streak tracking and daily goals
- Charts and activity heatmap
- Custom backgrounds
- Auto-sync from extension to website
Already tracking? Make it permanent.
A free account keeps your data safe and unlocks the community.
Compete in seasonal rankings
Every 60 days a new season starts. Track hours toward a community leaderboard. Stay private or go public. Your content is never shared.
See your full immersion story
Weekly patterns, activity breakdown, milestones, and a complete session history. A private dashboard only you can see.
Start tracking your immersion
Ready to keep your progress?
Free forever. No paid tiers, no data selling. JP343 is a community project.
Already have the extension? Create a free account to sync and join the leaderboard.
FAQ
Is it free?
Yes. Everything is free, no paid tier. JP343 is a community project.
Do I need the browser extension?
The extension auto-tracks YouTube, Netflix, Crunchyroll, Prime Video, Disney+, Comprehensible Japanese, and Spotify. With an account, you can also log hours manually on the website.
What platforms are supported?
The extension auto-tracks YouTube, Netflix, Crunchyroll, Prime Video, Disney+, Spotify, and CI Japanese. You can also log anything manually: books, podcasts, conversations.
Do I need an account?
No. The extension works without one. But without an account, your data lives only in your browser. An account adds cloud sync, a personal dashboard, and optional leaderboard participation.