One Sec vs ScreenZen: Which One Should You Use?

6 min read · Brainrot Test

One Sec vs ScreenZen is a battle between two "pause" apps. Both make you wait before a distracting app opens. One Sec uses a short breathing animation and has actual published research behind it, but its free version is limited and the full app is a paid subscription. ScreenZen uses a customizable countdown, adds open limits and schedules, and doesn't charge for its main features.

If you're shopping for a pause app, your real problem is probably opening apps on reflex, and Brainrot Test shows how strong that reflex is in 17 questions: Check my brainrot.

Quick verdict

• Choose ScreenZen if you want the most features for no money, and you like tweaking rules per app.
• Choose One Sec if you want the calmest, simplest pause, like its breathing approach, and don't mind paying to unlock more apps.
• Try both free versions first. Pause apps are very personal. The one that doesn't annoy you enough to uninstall is the one that works.

How each one works

How One Sec works

When you tap an app you've added (say, Instagram):

1. A breathing animation plays for a few seconds.
2. One Sec asks if you still want to open it.
3. It shows how many times you've tried today.
4. You continue or close.

It feels like a tiny deep breath before the scroll. That's the point.

The research bit: One Sec was studied by researchers from Heidelberg University and the Max Planck Institute, with results published in the journal PNAS in 2023. They found the pause reduced how often people opened the target apps. That's rare: most screen time apps have no published research at all.

How ScreenZen works

When you tap an app you've added:

1. A countdown appears (you set the length).
2. ScreenZen asks if you want to continue.
3. It shows how many times you've opened it.
4. Optional extra rules kick in: max opens per day, max time per session, schedules.

Same idea, more knobs. For the full rundown, see our ScreenZen review.

The key difference

One Sec is built around the pause. ScreenZen is built around the pause plus limits. If you just need a mindful moment, One Sec is lovely. If you need the app to say "that's your 10th open today, you're done," ScreenZen does more.

Price: One Sec free vs Pro, and ScreenZen

One Sec

• Free version: works with one app.
• One Sec Pro: a paid subscription for more apps and features.
• Check the store for today's price; it changes by country and over time.

ScreenZen

• Free to download, and its main features don't need a subscription.
• Supported by optional donations.

Budget verdict: if you have one killer app (just TikTok, say), One Sec's free version might be all you need. If you have three or four problem apps and no money, ScreenZen wins.

Strictness

Neither app is a hard blocker. Both are "friction apps," and both can be skipped if you're determined.

What makes each one easier or harder to skip

One Sec:

• The pause is short, so it's quick to tap through once you're used to it.
• Its research points to the pause working because it's gentle, so people keep it installed.

ScreenZen:

• You can set longer waits and hard open limits.
• It has options to make changing your own settings slower, which helps at 1am.

The "tap-through" problem

With any pause app, the danger is habituation: after a few weeks, you stop noticing the pause and tap through it automatically. Signs it's happening:

• You can't remember seeing the pause screen today.
• Your open count is going up, not down.
• You've started opening the website instead.

That's the problem with doing it alone: you can't really tell if a pause app is still working or if you've just gotten used to it. Brainrot Test asks 17 questions about what you do when you pick up your phone, gives you a score from 0 to 100, and measures you again every Sunday, so you can see if things are actually changing. Check my brainrot

Which one suits you?

You, if you pick One Sec

• You want something calm, not bossy.
• You like the breathing idea.
• One or two apps are the problem.
• You're okay paying for Pro if you want more.

You, if you pick ScreenZen

• You're on a zero budget.
• Several apps are eating your day.
• You want open limits, not just pauses.
• You enjoy setting up rules (different ones for school days, weekends, bedtime).

Scenario check

• "I pick up my phone between every lesson and open TikTok without thinking." → Either works. ScreenZen's open limit is a nice bonus.
• "I open Instagram once and lose 90 minutes." → Neither is ideal. You want a session limit (ScreenZen) or a scheduled block (see ScreenZen vs Opal).
• "I've deleted every app blocker I've ever installed." → Look at physical options. Read One Sec vs Brick.

Other One Sec alternatives

People comparing these usually also look at:

• One Sec vs Opal: Opal is a scheduled blocker, much stricter.
• One Sec vs Jomo: Jomo leans on rules and focus sessions; see our Jomo app review.
• Built-in tools: iPhone Screen Time and Android Digital Wellbeing, free and already installed.

Using them together

Can you run One Sec and ScreenZen at the same time? Technically, yes, on different apps. But stacking two pause screens on the same app is just annoying, and annoyed people uninstall things.

A better combo:

1. One pause app (One Sec or ScreenZen) for reflex opens.
2. One scheduled block for study or sleep time, using built-in Screen Time/Digital Wellbeing.
3. One way to track progress, so you know the setup is working.

Know your habit before you pick your pause

One Sec vs ScreenZen matters less than knowing what you're fighting. In the next minute, Brainrot Test gives you a brainrot score from 0 to 100 and shows how you compare with everyone else. Each daily two-minute drill then ends with one real-world phone action, like putting your phone in another room for 10 minutes, and every drill you finish takes a point off your score.

Check my brainrot

FAQ

Is One Sec or ScreenZen better?

ScreenZen is better if you want more features without paying, like open limits and detailed schedules. One Sec is better if you prefer a calm, simple breathing pause and like that it's been studied. Try both free versions to see which one you'll actually keep.

Is One Sec free?

One Sec has a free version that works with one app. More apps and features come with One Sec Pro, a paid subscription. Check the App Store or Google Play for current pricing.

What do people say about ScreenZen on Reddit?

In threads on r/nosurf and similar subs, people mostly praise ScreenZen for being free and flexible. The main complaint is that you can still change your own rules, so it works best if you turn on the settings that slow changes down.

Does One Sec actually work?

A 2023 study published in PNAS by researchers from Heidelberg University and the Max Planck Institute found that One Sec's pause reduced how often people opened the apps they'd targeted. Results will differ for each person, and the effect can fade if you start tapping through without thinking.

What are the best One Sec alternatives?

ScreenZen is the closest free alternative. Opal is stricter with scheduled blocks, Brick is a physical lock, and your phone's built-in Screen Time or Digital Wellbeing is free and already installed.