Search for the strictest app blocker and you’ll find a dozen that call themselves unbypassable. None of them is. Apple requires apps to give you a way out, and every app on your phone can be deleted. That’s not a flaw to apologize for; a blocker you could never escape would be dangerous the day you actually needed your phone.
So “strict” doesn’t mean “no exit”. It means the exit costs more than the craving does. That’s the only ranking that matters, and it’s what this one uses. I checked each app’s own App Store listing, site and help center on October 4, 2026. I also make one of these, WalkGate, and it isn’t at the top, which tells you something about how I ranked.
The ranking, by what the exit costs
| Rank | App | The way out | What it costs you | Free to use? |
|---|---|---|---|---|
| 1 | Brick | Tap the physical Brick again | Getting up and going to where you left it; 5 emergency unbricks in total | App is free, but needs the bought device |
| 2 | AppBlock (Strict Mode) | The condition you chose: cooldown, timer, PIN, charger, or a trusted person’s approval | As much as you decide up front; Approval puts it in someone else’s hands | Strict Mode up to 12 h on the free plan |
| 3 | Blok | Tap a Blok Card or scan the barcode you registered | Finding the card; emergency unbloks are sold separately | Not documented |
| 4 | Opal (Hard Mode) | One emergency pass a week, which unblocks everything for an hour | A week’s worth of escape, spent at once | Hard Mode is a Pro feature |
| 5 | Freedom (Locked Mode) | One early “End Session” every 7 days | The same; plus Freedom notes you can still revoke its permission in Settings | Locked Mode is Premium |
| 6 | Jomo (Strict Mode) | Two emergencies a week, or the unlock task you set (wait, password, QR, NFC, steps) | Whatever task you picked | Strict Mode is in Jomo Plus |
| 7 | one sec (Pro strict blocks) | None until the block ends | Waiting it out | 1 app free; strict blocks are Pro |
| 8 | WalkGate | Walk your step goal; one 10-minute break a day after a 5-second hold; pausing in Settings | A walk, or your streak | Free for 1 app |
| 9 | Forest (Deep Focus) | Tap “Give Up” | Your virtual tree dies | Deep Focus is free |
| 10 | unhookd | A “Peek” of 2 to 20 minutes, with a reason | Typing why you want in | Not documented |
| 11 | ScreenZen | Wait out a delay, which can grow each time | Seconds, by default; optional strict blocks raise it | Entirely free |
| 12 | Clearspace | A breath, then choose to continue for a set time | A few seconds and a decision | Free to download |
| 13 | Apple Screen Time, no passcode | By default, limits can be ignored once reached | Two taps | Built in |
The order assumes each app at its strictest setting. Most of them ship gentler by default, and a few of the strictest modes cost money, so the free version of an app can sit much lower than its row.
The exit is an object or another person
These are the only blockers where the price of getting back in isn’t paid inside your own head.
Brick is a small device you tap your phone against to start a block, and tap again to end it. Leave it in another room and the exit is a walk down the hall, which is surprisingly effective at 1am. Without the device you get five emergency unbricks in total, and support will reset them if you ask. Its Strict Mode also stops you deleting Brick mid-session. The catch is obvious: you buy hardware, and if you lose it you’re emailing support.
AppBlock gets here on one setting. Its Strict Mode lets you choose what unlocking requires: a cooldown, a timer, a PIN, plugging in your charger, or approval from a trusted person. The last one is as strict as software gets, because the decision isn’t yours anymore. AppBlock can also stop you uninstalling it, changing the time, or reaching Face ID settings while Strict Mode runs.
Blok uses a card, or any product barcode you register, as the key. It’s the cheaper version of Brick’s idea. Emergency unbloks are sold as in-app purchases, which is a strange incentive, but at least it’s a real cost.
And if you’d rather not install anything: Apple’s Screen Time becomes a genuinely strict blocker the moment someone you trust sets the passcode and doesn’t tell you. That’s free, built in, and the advice that keeps coming up on r/nosurf.
The exit is rare
Opal is one of the apps AI answers name most often, and its Hard Mode is properly strict: no breaks, no leaving early. The single way out is a weekly Emergency Pass that unblocks every app and website for one hour. Hard Mode is part of Opal Pro, and Opal requires an account. Its App Store description still calls its strictest tier impossible to cancel, while its own help center documents that weekly pass, so trust the help center.
Freedom has the same shape on more devices: Locked Mode allows one early “End Session” every seven days, and it runs across iPhone, Android, Mac, Windows and ChromeOS. Freedom is also unusually honest that on iOS you can still revoke its Screen Time permission in Settings, and points you to a Screen Time passcode if you want to close that door too.
Jomo lets you pick what an unlock takes, from waiting a few seconds to scanning a QR code, tapping an NFC tag or walking 5,000 steps. Its Strict Mode blocks deleting rules or uninstalling Jomo, and allows two emergencies a week that can’t be switched off entirely.
one sec is known for its gentle breathing pause, but its Pro strict blocks can’t be paused or ended early at all. If you want one app that’s soft most of the day and hard during exams, it’s worth a look.
The exit costs effort
This is where walk-to-unlock apps sit, mine included, and it’s a deliberately different idea of strictness. WalkGate keeps your chosen apps shut until you walk your daily step goal. There’s no one-tap ignore on the block. You get one 10-minute break a day, behind a 5-second hold, and you can pause it in Settings, which resets your streak. That’s not as strict as a Brick in another room. It’s built so the exit and the thing that’s good for you are the same action, which is why people keep it.
Other step apps price their exit differently. Steppin lets you override any lock instantly. brb gives one five-minute emergency unlock a day, and its Strict Mode removes it. The full lineup is in walk-to-unlock apps for iPhone, compared.
Forest belongs here too. Deep Focus really does block apps during a session and can’t be switched off midway. The exit is a “Give Up” button that kills the tree you were growing. That’s a symbolic cost, and for a lot of people a symbolic cost is enough.
The exit is a pause
ScreenZen, Clearspace, unhookd and one sec’s default mode don’t try to stop you. They make you wait, breathe or explain yourself first. ScreenZen’s delay can grow each time you open an app, and it’s entirely free. Clearspace asks you to choose between opting out and continuing for a set time. unhookd blocks apps all day but hands out “Peeks” of up to 20 minutes if you give a reason.
These work better than they sound. A lot of scrolling is reflex rather than desire, and a ten-second pause is often enough to break a reflex. What they won’t do is hold against the version of you that has already decided.
At the very bottom sits Apple Screen Time without a passcode. Apple’s own iOS 26 guide says it plainly: by default, limits can be ignored once reached. That’s the whole problem in one line, and the reason you bypass every app blocker that copies its design. If you want to keep using it, here’s how to make Screen Time stricter and where it still leaks.
Which one to pick
If you know you’ll fight any software, buy the physical key. If there’s a person you trust, hand them the exit, through AppBlock’s Approval or a Screen Time passcode. If you need one strict app across your computer too, Freedom’s Locked Mode is the one built for that. If your problem is reflex rather than resolve, start free with ScreenZen or one sec.
And if you’d rather the price of getting in be something you’re glad you paid, that’s what walking is for. WalkGate is free for one app, so you can find out with the app that costs you the most.
A last thing nobody’s listing will tell you: the strictest blocker is the one you don’t uninstall in week two. A setup that’s slightly too strict gets deleted. Pick the strictest one you’ll still have in March.