Every method on this list can be undone by the person it is protecting, usually in under thirty seconds. That is not a flaw in any particular app. It is a property of the platform: iOS gives you the keys because it is your phone, and any tool that appears to take them away is really asking you to agree not to use them. Knowing exactly where each method breaks is more useful than picking the strictest one.
Here is what each way stops, and what defeats it.
1. Screen Time app limits
Settings, Screen Time, App Limits. Set a daily allowance per app or category.
What it stops. Nothing, technically. At the limit you get a screen saying you are out of time, with a button offering one more minute or the rest of the day.
What defeats it. The button. It is one tap and it requires no passcode unless you set one. Most people set the limit, meet the wall four times, and stop reading it entirely by the second week. The half life is documented in why your app blocker stopped working.
Worth using if. You want an honest count of when you cross a line, rather than a barrier.
2. Screen Time with a passcode
Same feature, plus a four digit code under Screen Time settings.
What it stops. The reflex tap. You now have to enter a code to continue.
What defeats it. You know the code. If you set it yourself in a calm moment, the tired version of you at 11pm also knows it, and typing four digits is not a meaningful obstacle. Giving the code to a partner works better and costs something else, described in we gave each other the Screen Time passcode.
Worth using if. The problem is speed rather than intent. A code adds about four seconds.
3. Focus modes
Settings, Focus. Choose which apps and people can reach you, and optionally which home screens are visible.
What it stops. Notifications, and the visual presence of apps if you hide home screen pages.
What defeats it. Focus modes filter interruptions coming in. They do not stop you going out. The app is still installed, still searchable with a swipe down, and Spotlight will open it happily. It is also switched off from Control Centre in one tap.
Worth using if. Your problem is being pulled in by notifications rather than reaching out on your own. That distinction matters, and most people have the second problem.
4. Deleting the app
The nuclear one, and the most common.
What it stops. Everything, genuinely, for as long as it lasts.
What defeats it. Reinstalling. The App Store remembers your account, the password is in the keychain, and the whole operation takes twenty seconds on the exact evening you have the least capacity to resist it. Deletion also removes the parts you actually wanted, which is why people come back. The full arc is in I deleted Instagram and came back.
Worth using if. You genuinely never need the app. For most people that is true of one app on the list and false of the rest.
5. Third party blockers
Opal, Brick, ScreenZen, Freedom and the rest. These build on Apple's Screen Time API, so they all sit on the same foundation.
What they stop. More than Apple's own limits, because they add strict modes, delays, sessions and in some cases hardware.
What defeats them. Depends on the tool. Strict modes are usually defeated by deleting the blocker itself, by changing the device clock, or by restarting. Hardware tiles are defeated by not having the tile with you. And in every case the tool becomes an opponent, which produces the outcome in strict mode made it worse.
Worth using if. You have tried the free options and want a real wall. Go in knowing that walls in this category are agreements, not physics.
6. Content and privacy restrictions
Screen Time, Content and Privacy Restrictions, Allowed Apps. Turn an app off at the system level.
What it stops. Quite a lot. The app disappears from the home screen and from search.
What defeats it. The same Screen Time passcode, in the same Settings pane. This is designed for a parent managing a child's device, and on your own phone you are both parties.
Worth using if. You want the strongest native option and are honest that it is still self-administered.
The pattern under all six
They all try to make the app unavailable, and none of them can, because you own the device. The strongest thing any of them achieves is friction, measured in seconds.
Friction is not nothing. Seconds are exactly where the decision lives. But friction sold as a wall breaks the moment you go around it, and going around it teaches you that the tool is defeatable, which is a lesson you cannot unlearn. That is why the second month is always worse than the first.
The one we do not do
We do not block. It is worth saying plainly because it is the reason to choose this or to skip it.
The apps you pick get interrupted, not sealed. Something arrives, asks for one breath, about ten seconds, and then opens the app. There is no passcode to defeat, no strict mode to work around, and no version of the tool that refuses you, so there is nothing to build a resentment against. The case for that shape is in an app blocker that does not block, and what the pause is actually doing is in what should happen when your phone interrupts you.
The honest cost: you can always continue. If what you want is a tool that stops you regardless of what you want at the time, none of the six above will do that either, but at least they will pretend to.
What to do first
If you have never set anything, start with app limits and no passcode, on the two apps that actually take your evening. Not all of them.
Watch what happens for a week. If you meet the wall and stop, that method is enough and you can stop reading. If you meet the wall and tap past it every time, the problem is not the strength of the barrier, and adding a stronger one will produce the same result with more friction and more resentment. That is the point where a pause is worth trying instead of a wall.
The pause version is reCalm. It uses the same Screen Time permission as everything above, but the shield it puts up asks for one breath instead of holding a line, and it always opens: after the breath, or by itself after 15 minutes. Nothing to tap past, so nothing to learn to tap past.
Frequently Asked Questions
What is the strongest way to block an app on iPhone?
Content and Privacy Restrictions with a Screen Time passcode you do not know, which in practice means someone else sets it. Everything else you can undo yourself in seconds.
Can I block apps without deleting them?
Yes. App limits, Focus modes and Allowed Apps all leave the app installed. Deleting is the only one that removes it, and it is also the easiest to reverse.
Why does my app limit stop working after a few weeks?
Because the Ignore Limit button is one tap away and does not need a passcode by default. A wall you pass daily stops reading as a wall.
Does Focus mode block apps?
Not really. It filters notifications and can hide home screens, but the apps remain installed and openable through search. It helps with being pulled in, not with reaching out.
Is there a way to block apps that I cannot undo?
Not on your own device, no. iOS gives the owner the keys by design. Anything claiming otherwise is relying on friction, hardware you can leave behind, or someone else holding a passcode.