You don’t need more willpower.
You need a pause.
Sero puts a moment of friction between reaching for an app and opening it. Limits you set. Blocks that hold. A phone that waits for you to decide.
Free to start · iPhone · No account
Nobody decides to lose three hours.
It happens in pieces. A notification. A thumb moving before a thought arrives. Twenty seconds, forty times a day, and the evening is gone.
The problem was never that you wanted it. The problem is that nothing stood between wanting it and having it.
A second of friction changes the decision.
Sero isn’t built on restriction. It’s built on intentionality.
Every feature does the same small thing: it opens a gap between the impulse and the action. Not a wall. A pause. Long enough for you to notice what you’re doing and choose again.
Most of the time, you choose differently. That’s the whole product.
How it actually works.
- Scheduled sessions
Decide once. It repeats.
Block the apps you don't want after 20:00, or every weekday morning. You make the decision when you're clear-headed, and it holds when you're not.
The home screen only tells you two things: whether anything is blocked right now, and how long until the next one starts.
- Setting one up
Name it, pick the apps, choose the hours.
From and to. The days it runs. That is the entire setup, and it takes about a minute.
You are choosing on a calm Tuesday afternoon what your Friday evening is allowed to look like.
- Focus sessions
Start it with your voice. End it with your thumb.
Say “Hey Siri, start a focus session in Sero” and the countdown moves to your Lock Screen. Yesterday's session runs again with one tap.
And when you want out early, there's no button to tap — you have to hold it down. A few seconds of your own attention, which is usually enough to change your mind.
- What it costs you
Every Monday, the shape of your week.
Your screen time by hour and by category, any day you want to look at. Then a weekly recap: the daily average, and whether it moved against the week before.
Not a scolding. A picture, so next week's decisions come from something real.
Sero is harder to use than most blockers.
That is not an apology. It is the same decision made three times: getting back in has to cost you something, or it is not a decision at all.
- 01
One emergency unlock a day.
Three on Premium. Use it at eleven in the morning and the rest of the day is on you.
- 02
Ending a session early means holding the button.
Not tapping it. A few seconds is long enough to notice what you are doing.
- 03
Opening a blocked app means playing first.
Score 15 points in the challenge and you have earned 15 minutes. There is no other door.
If you want a blocker you can talk your way past on a bad evening, there are good ones. This is not meant to be one of them.
Nothing.
Sero has no servers. No account, no email, no sign-up. No analytics, no crash reporting, no advertising, no tracking of any kind.
Your limits, your schedules and your history live in Apple’s Screen Time on your own device. We never see them, because there is nowhere for them to go.
No account
No email, no sign-up, no profile to delete.
No servers
Nothing for us to run, and nothing to breach.
No analytics
No crash reporting, no advertising, no tracking SDKs.
Free to use. Premium when one isn’t enough.
Premium
- Apps you can blockUnlimited
- Scheduled sessionsUnlimited
- HistoryAll time
- Emergency unlocks3 a day
Managed by Apple. Cancel anytime in your App Store settings.
Still being built.
Nothing here is promised. It’s what we’re working on.
- In progress
Sessions, redesigned
A clearer picture of what is running, what is scheduled, and what is nearly spent.
- In progress
A Sero mascot
Something with a face to keep you company through the pause.
Questions, answered plainly.
Can I get around the block?
Two ways. An emergency unlock opens it instantly, but you only get one a day (three on Premium). Or you play the challenge: 15 points buys 15 minutes. Both are limited on purpose.
What's the difference between a limit and a schedule?
A limit is an amount of time per day. A schedule is a window on the clock. You can run both at once.
Does Sero see which apps I use?
No. Sero has no servers and no account. Everything lives in Apple's Screen Time on your device.
What happens to my data if I delete Sero?
There's nothing of yours anywhere else to delete. Your usage history belongs to Apple's Screen Time, not to us.
Can I start a session hands-free?
Yes: “Hey Siri, start a focus session in Sero.” The countdown appears on your Lock Screen.
Is it on Android?
Not yet. iPhone only for now.
Does Sero run in the background watching me?
No. Restrictions are enforced by Apple's own Screen Time framework at the system level.
Is Sero free?
Yes, with a Premium tier. See pricing above.
Give yourself the pause.
Free to start. No account. Your first limit takes about a minute to set.