Less noise. More meaning.
Busy all day.
Nothing to show for it.
It's not a lack of time. It's a lack of a lock. Cerno blocks your secondary tasks until the essential work is done.
The problem
The day doesn't vanish all at once. It crumbles.
An email. A message. A note to refile. Each move is legitimate, each move is small, and none costs enough for you to say no.
At 6 pm, your list shows nine checked boxes. None of them is the one that mattered. And you're too tired to start on it.
The worst part: you did work. You can't even blame yourself for wasting your time. That's what makes the trap invisible — and why it closes again tomorrow, exactly the same way.
Yesterday, honestly
- 8:12 amClear the inboxdone
- 9:05 amMeeting with no agendadone
- 10:40 amReorganize the Drivedone
- 11:20 amReply on Slackdone
- 2:15 pmUpdate the trackerdone
- 4:30 pmReread yesterday's notesdone
- — The project that decides the quarter tomorrow
The promise
One task. The right one.
Nothing to learn, no system to maintain. One constraint, set once in the morning, that decides for you when your willpower is tired — which is to say, pretty much all the time after 11 am.
The mechanism
Secondary tasks are locked. Literally.
You write down what matters — three or four lines, not twelve. Everything else drops into “Next”: greyed out, out of reach, uncheckable. Sorting your email stops being an option at 9 am.
The lock opens when the essential work is done. Not when it suits you. On days when life demands it, there's one way out: move the task up into the essentials, with a single arrow. That gesture is enough to turn an automatic drift into a deliberate decision.
What changes · 01
You'll finally know where your hours go
Start a session on the task at hand: its estimate becomes your target time, adjustable with a tap on + or −. No estimate? Twenty-five minutes, or open-ended, with no limit. During the session the tabs fade away: only the task and the time remain.
The timer doesn't stop at your target: a discreet chime, and it keeps going, no blame. What gets recorded is the time actually spent, never your estimate. You don't lie to yourself about your own numbers.
What changes · 02
One bad day won't erase three weeks
The flame lights up as soon as one essential task is done that day, timed or not. One is enough.
And a habit's streak only breaks after two missed days in a row. Sick on a Tuesday? Nothing happened. This tolerance applies from day one: you don't have to earn it.
What changes · 03
Twelve checked boxes don't make a day
The chart doesn't count your tasks. It measures the time actually spent on what mattered, weighted by your level of focus.
No score, no grade. A 1-out-of-3 day is displayed exactly like a 3-out-of-3 day. Cerno doesn't judge you — it shows you.
The proof
What you can verify, rather than what we promise
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Verifiable in ten seconds
Turn off the Wi-Fi: the app keeps working. Open your browser's network tab: nothing you write goes out. Your tasks aren't on any server, because no server receives them.
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Nothing to lose by trying
No account, no card, no free trial that turns into a subscription. If it's not for you, you close the tab. Nothing stays with us, not even an email address.
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The principle isn't new
Focusing your day on one single thing is old advice, repeated everywhere and followed almost nowhere. Cerno doesn't reinvent it: it makes it binding. That's the whole difference between knowing and doing.
No testimonials yet: Cerno has just launched. We'd rather leave this line empty than invent reviews — and you probably would too.
Objections
What you're telling yourself right now
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“I already have a to-do list.”
And it lets you check off “sort emails” at 9 am without batting an eye. The problem was never writing tasks down, it was always choosing which one. Cerno is the only list that says no for you.
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“It's too rigid for me.”
The lock has a way out, visible on screen: an arrow that moves the task up into the essentials. You'll rarely take it, because you have to own it — and that gesture turns an automatic escape into a conscious choice.
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“Yet another productivity app.”
This one has no tags, no projects, no Kanban view. We removed everything that lets you organize your work instead of doing it. Four screens remain, and that's on purpose.
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“I don't have time to get started.”
There's nothing to set up, nothing to import, nothing to install. You open it, you write one line, and you're off. Thinking about it already takes longer than starting.
Tomorrow will be exactly the same day.
Unless something refuses, on your behalf, to let you start with the easy stuff.