Which Screen Time App Is Best? ScreenZen, Opal, ClearSpace, Forest, one sec and Pause Compared

There's no single best screen time app. There's the best one for the way you get pulled into your phone. Some people need a wall they can't climb. Others just need a second to notice what their thumb is doing. Here are six of the most popular options on iPhone, including the one I make, with what each does best and where it falls short.

Full disclosure: I'm the founder of Pause, one of the six. I've tried to describe every app the way its own makers would, using each company's website and its US App Store listing. Ratings and prices change often, so check the listing before you decide. Last checked: October 20, 2026.

The short answer

• Best free option: ScreenZen. It's donation-supported and free, with no subscription.
• Strictest blocking: Opal. Its hardest mode can't be turned off once it starts.
• Best backed by research: one sec. A peer-reviewed study found its pause made people open their target apps about a third less often.
• Best for accountability: ClearSpace, with challenges and accountability partners.
• Best for focus sessions: Forest, which grows a tree while you stay off your phone.
• Best if you want a few seconds of real attention instead of a wait: Pause, which asks for a short puzzle before an app opens.

Two approaches: walls and speed bumps

Almost every app here does one of two things. Walls block an app on a schedule or after a limit, so you can't get in. Speed bumps let you in, but only after a short pause: a wait, a breath, a question, or a puzzle. Walls are great for protected time like work or sleep. Speed bumps are built for the all-day, half-conscious checking that adds up to hours.

Speed bumps sound too gentle to work, but the best evidence we have says otherwise. In a six-week field study of 280 people published in PNAS in 2023, one sec's pause led users to back out of about 36% of their attempts to open a target app, and to try opening those apps about 37% less often overall. (One of the study's authors is one sec's founder, so weigh it accordingly. It's still the strongest public evidence I know of for this kind of app.)

At a glance

ScreenZen

ScreenZen adds a delay before the apps you choose, and that delay can grow longer each time you open the same app. Around it are daily limits, schedules by day and time, prompts like "Is this important," breathing exercises while an app is locked, a strict mode, and a settings lock so you can't quietly change the rules mid-craving.

What it does best: it gives away for free what most apps here charge for, and it's very thoughtfully built. Worth knowing: some people learn to wait out a timer on autopilot, which is the main reason they look for something else.

Opal

Opal is the most complete blocking toolkit here. You can block apps and websites on a schedule, set daily limits, run a focus timer, and track your day as an Opal Score. Its strictest mode can't be cancelled or bypassed once it starts, and blocking follows you to your Mac.

What it does best: firm, cross-device walls for people who need to be kept out. Worth knowing: it's the priciest option, and strict modes can feel heavy for everyday use. The iPhone app needs iOS 18 or later.

ClearSpace

ClearSpace asks you to take a deep breath before a limited app opens, then lets you continue or opt out. It adds limits, schedules, and two things the others mostly don't: Screen Time Challenges, which include exercises like pushups, and accountability partners who can help you keep your goals.

What it does best: making your goals social and physical, not just a setting. Worth knowing: the full app is a paid subscription, and it's iPhone only.

Forest

Forest turns focus into a game. Start a timer and a virtual tree grows while you stay off your phone. During a session, its Allow List blocks distracting apps; outside sessions, Time Guard blocks apps on a schedule. Forest also says it has funded over 2 million real trees through the nonprofit Trees for the Future.

What it does best: study and deep-work sessions, with a reward you can see. Worth knowing: it's built around sessions you start on purpose, so it does less for random checking during the day.

one sec

one sec pioneered the speed-bump approach: a short breathing animation before a distracting app opens, with the option to back out. It can also bring the pause back after a set time, so a quick look doesn't quietly become an hour. It's free for one app, works with websites through a Safari extension, and is the only app here with a peer-reviewed study behind it.

What it does best: evidence and polish, with a lifetime purchase option. Worth knowing: the pause is a breath, not a task, so like any wait it can become routine.

Pause

Pause is the one I build, and it's also a speed bump. When you open an app you've chosen, Pause asks you to solve a short puzzle first, like Word Jumble, Five Letters or Ball Sort. Then you pick how long to stay, from 5 to 20 minutes, and the pause comes back on its own when the time is up. You can set named free windows, like lunch, and see how many times you walked away. The free plan covers one app with three puzzles that rotate (Word Jumble, Ball Sort and Sliding Tile); Premium unlocks every app and puzzle, with a 7-day free trial.

I built it around a puzzle because a few seconds of real attention is harder to do on autopilot than watching a countdown. That's my bet, not a proven result: unlike one sec, Pause hasn't been through a published study.

What it does best: keeping your apps while breaking the reflex, with something calm to do in the moment. Worth knowing: it's iPhone only, the newest and smallest app here (9 ratings at the time of writing), and it has no lock-you-out mode by design. If you need a hard wall, Opal is stricter.

How to choose

1. Notice how you break your own limits. If you override them on purpose and regret it, you want a wall: Opal, or Forest during work. If you open apps without thinking, you want a speed bump: ScreenZen, one sec, ClearSpace or Pause.
2. Pick the speed bump that holds your attention. A wait (ScreenZen), a breath (one sec, ClearSpace), a physical challenge (ClearSpace) or a puzzle (Pause). The best one is the one you won't learn to ignore.
3. Start free. ScreenZen is free, one sec and Pause are free for one app, and the rest have free downloads or trials. Try one for a week before paying for anything.

Sources

• ScreenZen: screenzen.co and App Store listing
• Opal: opalapp.com and App Store listing
• ClearSpace: App Store listing
• Forest: forestapp.cc and App Store listing
• one sec: one-sec.app/research and App Store listing
• Grüning, Riedel & Lorenz-Spreen (2023), “Directing smartphone use through the self-nudge app one sec”, PNAS 120(8)
• Pause: App Store listing

Keep reading

• Looking for a ScreenZen Alternative? 3 Options for iPhone
• Looking for an Opal Alternative? 3 Options for iPhone