The short version
You install Sarenica on Windows. It runs in the background and watches the work you already do — typing rhythm, mouse activity, screen time, optional camera signals like blink rate. That data stays on your machine. After a few days, you have a baseline: what a normal week looks like for you.
Then Hydrogen can answer real questions. Not “am I productive?” — that’s a guess from any tool. Questions like: did this week’s afternoons drop compared to last month’s, or which days had the most reliable focus. Comparisons against your own past, not a generic benchmark.
Who it’s for
Knowledge workers who spend long stretches at a desk and want a private way to see their own patterns. Not a manager-surveillance tool. Not a quantified-self gadget that demands a wearable. It’s deliberately built for the case where the laptop is the instrument.
Why local-first
Fatigue and focus signals are intimate. They reveal when you struggle, when you slow down, when you’re tired. That information should not live on someone else’s server by default. Sarenica processes signals on your device. Sync to the cloud is opt-in, feature-by-feature, and clearly disclosed.
When Hydrogen actually helps
Hydrogen needs something to compare. The first week of data is rough — too little signal, too much noise. Around two weeks in, the comparisons get sharper. By a month, you can ask Hydrogen things that no general-purpose AI tool can answer, because no other tool has your real desktop history to work from.
Quick answers
- What does Sarenica do?
- Sarenica is a Windows app that tracks fatigue and focus locally, then lets Hydrogen — its AI agent — compare real work-pattern changes for you.
- Do I need a wearable?
- No. Wearables are optional context. The baseline starts with your Windows work pattern alone.
- When does Hydrogen become useful?
- After a few normal workdays of baseline tracking. With nothing to compare, AI answers are guesses.