One Sec vs ScreenZen: Pick by Problem Shape

Both apps cost close to nothing. Both add friction instead of hard blocks. Both have legitimate free tiers. Past that, they solve different problems — and picking the wrong one means you’ll be back searching for alternatives in three weeks.

The short answer: One Sec is built around one (or a few) apps that ruin your day. ScreenZen covers your whole phone for free, with limits. If Instagram is the issue, One Sec. If it’s everything plus Twitter plus Reddit plus YouTube, ScreenZen.

Pricing

Prices are approximate — check the App Store before buying, both have changed tiers before.

ScreenZen’s free tier is more generous in scope. You can add every app on your phone. The catch is a session cap: after a certain number of friction pauses per day, it stops intervening and lets you through. One Sec’s free tier gives you the full friction experience but only for one app.

If your budget is zero, ScreenZen covers more ground. If you only need one app blocked properly and want to stay free forever, One Sec wins on feature completeness.

How the friction works

One Sec makes you hold a breath. Literally — it runs a one-second (or longer) breathing animation before it opens the app. You can extend it. You can add a reflection prompt. The whole point is a conscious pause between impulse and action, then a question: do you actually want to open TikTok, or did you just twitch?

ScreenZen shows a customizable screen with a timer countdown. You set the delay — 10 seconds, 30, whatever. It also lets you set daily open limits per app (“only open Instagram 5 times today”) and session length limits (“close after 10 minutes”). The friction is rule-based where One Sec’s is mindfulness-based.

Neither lets you through instantly. That’s the product. But the texture is different: One Sec feels like a therapist gently catching you; ScreenZen feels like a self-imposed bureaucratic gate.

Feature comparison

One Sec has the deeper iOS integration and the richer reflection layer. ScreenZen has the daily-cap system, which One Sec doesn’t offer at all. If you want to cap yourself at 5 Instagram opens per day, ScreenZen is the only one of the two that does it.

Pick by problem shape

You have one bad app. One Sec, probably free forever. The breathing pause works well for single-app compulsions, the free tier is full-featured, and Apple Watch support means even your wrist catches you.

You have a general phone problem. ScreenZen. Set friction on every app at once, cap daily opens across the board, time-limit sessions. The free tier covers this adequately until the session cap kicks in.

You want mindfulness baked in. One Sec. The reflection prompts and breathing animation are the product; ScreenZen’s timer is just a countdown.

You want to track whether the limits are working. One Sec has better stats and a home screen widget — which is either useful accountability or a new thing to compulsively check.

You want hard blocks, not soft friction. Neither. For full blocks with no bypass, see The 9 Best App Blockers for iPhone, Ranked by Job. For commitment-device-style options, the Brick alternatives roundup covers the no-bypass end of the market.

The case against both

Friction apps require willingness to pause. In a strong enough compulsion loop, you will tap “let me in anyway” and feel nothing about it. Both apps log bypasses — mildly shaming, but shame has a ceiling.

If you’ve burned through One Sec or ScreenZen before, the next step is a harder block: Opal or Freedom for scheduled lockouts, or something with a real commitment layer.

This is the cheapest corner of the market with the most legitimate free options. Try the right one for your problem before spending real money. One Sec if it’s one app. ScreenZen if it’s everything.