See your real focus and fatigue patterns on Windows.
Track locally on Windows, add optional wearables, and use Hydrogen to compare real work pattern changes.
See your real day, not a guess.
The Windows app captures desktop signals locally so your first baseline starts with how you actually work, not how you think you work.
- Desktop signals captured automatically
- Baseline that builds from real activity
- Local-first by default, no cloud round-trip
Day, week, month, or year — see the shift.
Overlay any two periods at hour-of-day or session granularity. See exactly where focus and fatigue moved, not just averages.
- Overlay any two periods — day, week, month, or year
- Group by hour of day or by session — spot repeating dips
- Coverage check flags when a comparison is too thin
Ask Hydrogen about your own baseline.
Hydrogen answers using your real windows and repeated changes, so the next question is sharper than the last.
- Comparison-first prompts
- Repeated-window analysis
- Useful next questions, not vague summaries
You decide what leaves your machine.
Sync, wearable enrichment, and cloud features are opt-in. The core workflow runs locally on Windows from day one.
- Local-first capture by default
- Optional Fitbit and Oura enrichment
- Granular sync controls you actually see
What an answer actually looks like
Three exchanges Hydrogen handles, grounded in your own baseline.
Why did my focus drop yesterday afternoon?
Your 14:00 to 17:00 block ran 23% lower focus than your two-week baseline. The dip lined up with longer gaps between active windows, not lower input volume.
Compare this week with last week.
Mornings improved across the board. The 3 PM dip moved about 2 hours earlier, so afternoons end stronger but the slump now overlaps your meeting block.
When am I most focused?
Your highest focus score consistently lands between 09:30 and 11:00. Repeats on 4 of the last 5 weekdays with low variance — the clearest window in your baseline.
What changes after a week
The payoff is clearer comparisons, better timing signals, and fewer vague questions.
Learn the shortest path
Use one guide to build a cleaner baseline, then use the blog for fast reads and prompt patterns.
Track fatigue patterns during desk work, reduce noisy conclusions, and build a reliable baseline.
The Store listing is now the primary public install path. That improves trust, discoverability, and the default Windows onboarding flow.
Longer workflows for baselines, privacy-first setup, and comparison quality.
A direct explanation of what the app does and who it is for.
Common questions
What does Sarenica do?
Sarenica tracks fatigue and focus on Windows, starts with a local baseline, and uses Hydrogen to compare real work pattern changes.
Do I need wearables to use Hydrogen?
No. Wearables are optional enrichment. The core flow begins with the Windows app and becomes stronger when you add more context later.
When does Hydrogen become useful?
Hydrogen becomes useful after a few normal workdays of baseline tracking, especially when you ask comparison-based questions.
Three things Sarenica gets right
Capture your real day on your own PC before touching the cloud.
Works without Fitbit or Oura. Adds them when you're ready.
Every view is built to answer 'what changed between two weeks.'
Start the Sarenica workflow
Create your account, install on Windows, and return once your baseline is ready for Hydrogen.
Free to start. Your baseline is built from your own Windows activity, not from a pooled dataset.
The desktop app captures your signals locally. Install from the Microsoft Store or direct download.