Guide · Choosing a focus app
one sec alternatives: apps that add a pause before you open Instagram
If you're looking at one sec, you probably don't want a wall. You want a moment: a small gap between the thumb and the feed, long enough to ask whether you meant it. one sec made that idea popular, and it's a good idea. It isn't the only app that does it, and the pause itself can be built a few different ways.
Honesty note: this page is published by Calibrate, which appears last. Every app is described from its own website or App Store page, checked October 2026. Features and prices change, so check before you buy.
| App | What the pause shows | Can it block? | Cost |
|---|---|---|---|
| one sec | A breath (or another exercise), with intentions and reflection options | Yes, scheduled and strict blocks | Free for one app; Pro for more |
| ScreenZen | A wait that can grow with each open, and a prompt like "Is this important?" | Yes, by time, number of opens, or limit | Free; optional tips |
| Opal (gentler settings) | A short wait before a break from a blocking session | Yes, it's a blocker first | Paid plans; free trial |
| Screen Time + Shortcuts | Whatever you build: a message, or a jump to another app | Limits you set yourself | Free, built in |
| Calibrate | One breath, and up to three lines from your own to-do list | No, never | Free |
Why a pause works at all
Most phone use isn't summoned by the phone. In a study that filmed people's real days with wearable cameras, Heitmayer and Lahlou found that 89% of smartphone interactions were started by the user, not by a notification. The reach comes from you, often before you've decided anything. That's the moment a pause is built for.
And there is evidence that the moment matters. A six-week field study of one sec, published in PNAS in 2023, followed 280 people. On average they dismissed 36% of their attempts to open an app they had chosen to slow down, and by week six they tried to open those apps 37% less often than in week one. The study's authors include one sec's founder, which the paper states. It's still the best evidence any app in this category has, and it's why one sec deserves its reputation.
The apps, one by one
one sec · iOS, Android, browser extension · free for one app
The original. Opening an app you've picked brings up a short interruption: a deep breath by default, with other exercises to choose from. It has grown a lot around that core: intentions you set before opening, a brake that sends you out of a feed after a set time, journaling, and full blocking with strict modes for when you want a wall.
Tradeoff: the free version covers one app, and more than one needs a subscription or lifetime purchase. Some people find the breath turns into a ritual they tap through.
ScreenZen · iOS, Android, Mac, Windows · free
The generous one. A delay before the app opens that can get longer each time you open it, prompts like "Is this important?", limits on how many times a day you can open an app, and strict blocks if you want them. It's funded by optional tips rather than a subscription.
Tradeoff: lots of dials. Friction you design is friction you can redesign on a bad day.
Opal, on its gentler settings · iPhone, Mac, Android · paid plans
Opal is a blocker, but how hard it blocks is your choice. Its breaks setting goes from easy (pause briefly or end early) to harder (a longer wait before each break) to a hardcore mode on Opal Pro with no breaks and one emergency pass a week. On the easy and harder settings, the wait before a break works a lot like a pause.
Tradeoff: the pause is the exception and the block is the rule. If you only want the pause, you're paying for a lot of wall. Our Opal alternatives guide covers it in full.
Apple's Screen Time and Shortcuts · built into iPhone · free
Screen Time lets you set how long you use apps each day and when they're available. In the Shortcuts app, a personal automation can run when an app is opened, so you can make Instagram show a message or send you somewhere else first. Many people never need more than this.
Tradeoff: you build it yourself, and a limit you set for yourself is one you can change in Settings.
A pause needs somewhere to go
Here's the gap in most pauses. They ask "do you really want this?", and you answer honestly: not really, but there's nothing better in front of me. The reach was usually an exit from something, a hard email or a dull ten minutes, and a breath doesn't give you a different exit. So you tap through.
A pause works best when it shows you a better door at the same moment. That's the idea behind Calibrate's version.
Calibrate · iPhone, with Apple Watch · free
Ours. Calibrate is a calm to-do list with a focus timer, and its optional pause is called Apps that pull you. Pick the apps, then pick when: before one opens, after a total number of minutes you choose across all of them, or both. The pause says "One breath." and shows up to three lines from your own list. Two buttons: Open the app, which lets you in on the first tap, or My list. Nothing is blocked. It runs on your phone through Apple's Screen Time, and Calibrate never sees which apps you use.
Tradeoff: it never resists for you, so it won't hold anyone who wants to be held. It's iPhone only, and the pause only helps if your list has something real on it.
How to choose
- You want a hard wall. Use a blocker. Opal's hardcore mode, one sec's strict blocks, or ScreenZen's blocks will hold better than any pause. There's no shame in it, especially for an exam week.
- You want the pause, with research behind it. one sec.
- You want it free, with lots of control. ScreenZen, or Screen Time and Shortcuts if you like building things.
- You keep tapping through because there's nothing better to do. Calibrate, whose pause shows your list.
Whichever you pick, keep it on as few apps as you can. Two or three apps that really pull you is plenty; a pause on everything becomes background noise. If you're working out why you're reaching in the first place, why do I keep checking my phone? is the place to start, and how to stop doomscrolling without a blocker puts the pieces together.
Questions people ask
Is there a free alternative to one sec?
Yes. ScreenZen is free, with optional tips. Apple's Screen Time and a Shortcuts automation that runs when an app opens are built into every iPhone. Calibrate's pause is free too. one sec itself is free for one app; more apps need one sec Pro.
Does a pause before opening an app actually work?
There is real evidence for it. In a six-week field study of one sec published in PNAS in 2023, participants dismissed 36% of their attempts to open a target app on average, and by the sixth week they attempted to open those apps 37% less often than in the first week. One of the authors is one sec's founder, which the paper discloses.
Can I add a pause before Instagram without installing an app?
Partly. In the Shortcuts app you can make a personal automation that runs when an app is opened, and have it show a message or open something else. It takes some setting up and has fewer options than a dedicated app.
Does Calibrate block apps?
No. Before an app you picked opens, or after a total number of minutes you choose across those apps, it shows one breath and up to three lines from your own to-do list. Open the app lets you in on the first tap; My list takes you to your list instead. If you want a hard wall, a blocker is the better tool.
Sources
- Heitmayer, M., & Lahlou, S. (2021). Why are smartphones disruptive? An empirical study of smartphone use in real-life contexts. Computers in Human Behavior, 116, 106637. doi.org/10.1016/j.chb.2020.106637
- Grüning, D. J., Riedel, F., & Lorenz-Spreen, P. (2023). Directing smartphone use through the self-nudge app one sec. PNAS, 120(8), e2213114120. doi.org/10.1073/pnas.2213114120
- App features: one sec, ScreenZen, Opal help: breaks, Apple: Screen Time schedules and time allowances, Apple: Shortcuts automations. Checked October 2026.
A pause with somewhere to go
Calibrate is on the App Store. Free to use, with unlimited focus sessions.
Get Calibrate