Disclosure: we make enough., the third app in this comparison. one sec and Opal are the two apps our own users mention most, usually as the thing they tried first. Both are good, and each costs and does something different, so we'll go app by app.
Comparing one sec vs Opal vs enough. is really three theories of the same phone problem.
What each app is
one sec
one sec doesn't block anything by default. It intercepts the moment you open a distracting app and makes you take a breath first. Continue if you want; most of the time, people don't. A study with the University of Heidelberg measured app opens dropping by around 57 percent on average (CHI 2023), which makes one sec the rare app in this category with peer-reviewed evidence.
Beyond the pause: custom interventions (journaling prompts, math problems), re-interventions that break up long scrolls, a Safari extension, and support across iPhone, iPad, and Mac.
Opal
Opal is the flagship blocker on iOS, also on Android and Mac. You set schedules, time limits, and open limits, run focus sessions, watch your Opal Score, and on Pro you can pick a difficulty where a session can't be unblocked at all. It's the most refined product in the category, and it's priced like it knows that.
The free tier gives you one schedule or limit; meaningful use lives behind Pro.
enough.
enough. is a guided 7-day program for iPhone that helps you cut about an hour of screen time a day. Instead of handing you tools to configure, it walks you through one decision a day: a morning schedule first, then places where feed apps are blocked, then open caps on the apps that pull hardest, then blocking while you drive. Day 7 shows you your before and after. After that, the setup runs without you.
Our limitations, stated plainly: iOS only, newer than both of these apps, smaller team.
What they cost
Prices checked July 2026.
one sec pro: $3.99 a month, $19.99 a year, $99.99 lifetime (App Store). Free covers one app.
Opal Pro: $19.99 a month, $99.99 a year, $399 lifetime (pricing).
enough. Complete: $6.99 a month or $49.99 a year. The 7-day program is free, no card: one location, one schedule, one app limit, Quick Block, Driving Protection, Insights, and Together sessions with friends.
The spread is striking: Opal's year costs five times one sec's year. Lifetime options: $99.99 (one sec), $399 (Opal), $79.99 (enough.).
Three theories of the same problem
one sec's theory: the checking is a reflex, so add a beat of awareness and the reflex loses most of its power. True, and proven. The cost is that the question gets asked at every open, forever, and tired-you answers differently than morning-you.
Opal's theory: decide your limits, and let blocking enforce them. Also true, if you set it up well. That "if" is the quiet failure mode of every blocker: the app gives you tools to configure and no opinion about which ones, in what order, at what strictness. A too-aggressive first setup gets deleted by Thursday.
enough.'s theory: the setup is the hard part, so the product should be the setup. The program makes the decisions with you, one per day, starting easy on purpose, and ties each feature to a specific moment (the commute, the morning, 11pm). You decided once, with a clear head. The app holds the line after that.
They're not mutually exclusive, either. Some of our users keep one sec's pause on the apps they never blocked. You can fix your phone more than one way.
one sec vs Opal vs enough.: which to pick?
Pick one sec if you want the cheapest, gentlest intervention and you're not ready to have apps actually blocked.
Pick Opal if you want the most polished blocker on iOS, you'll invest the time to configure it well, and the price doesn't sting.
Pick enough. if you've tried the pause or the blocker and watched it fade. The 7-day program is free. Complete, with unlimited places, schedules, and stricter settings, is $49.99 a year. The goal is about an hour a day back, without renegotiating with your phone every time you pick it up.
