App blockers for studying: an honest comparison

You sit down to study for two hours. Forty minutes later you’ve read three pages, answered five messages and watched more videos than you’d like to admit. Your phone didn’t force you. It just made every small moment of boredom an exit.

App blockers close those exits. There are dozens of them, though, and most “best app blocker” lists are written by the makers of one of the apps on them. This comparison sorts them by how they stop you, because that decides whether one will still be running in two weeks.

Why your phone wrecks study sessions

Notifications cost attention even when you ignore them. In a 2015 study by Cary Stothart and colleagues, students did a task that demanded sustained attention. Those who received call or text notifications during the task made noticeably more mistakes, even though they never touched their phones. A buzz is enough to send your mind elsewhere.

Checking turns into a habit loop. Each check is a small reward: a message, a like, something new. Your brain learns to reach for the phone at every pause in the material, so the urge shows up exactly when studying gets hard.

The phone’s mere presence is less clear than you may have read. A widely shared 2017 study reported that having your phone on the desk, switched off, reduces available brainpower. A preregistered replication in 2022 found no such effect, and a meta-analysis found the effect small or uncertain. Putting the phone away still helps, but mainly because it removes the temptation to check, not because the phone drains you by existing.

What follows from this: silence notifications, and make the reflexive check harder. That’s the job of an app blocker.

Four kinds of app blockers

1. Hard locks

You set a schedule or start a session, and the chosen apps stay blocked until it ends. Some offer a strict mode that can’t be switched off early.

• Examples: Opal and AppBlock on the phone, Freedom on phone and computer, Cold Turkey on Windows and Mac.
• Good for: fixed study blocks, the exam week, anyone who wants the decision taken away.
• Watch out: all-or-nothing rules get switched off the first time they’re in the way, so set them only for the hours you really study.

2. Focus timers with a reward

You start a timer and stay off your phone until it runs out. Forest, the best known, grows a virtual tree that dies if you leave the app.

• Good for: people who respond to rewards and streaks, Pomodoro-style sessions.
• Watch out: it only works when you remember to start a session. The reflexive open between sessions isn’t covered.

3. Pauses

Before a chosen app opens, you get a short delay: a breathing exercise or a question about your intention. one sec and ScreenZen work this way.

• Good for: catching automatic opens without banning anything.
• Watch out: for some people the pause becomes part of the routine after a few weeks.

4. Study-to-unlock apps

Before a chosen app opens, you answer a few flashcards or quiz questions. Braintoll works this way on Android and iPhone; StudyLock, QuizLock and ScrollScholar do something similar on the iPhone.

• Good for: students with material to review. The interruption itself becomes study time, so even the opens you don’t resist teach you something.
• Watch out: you need cards or notes to study from. Many of these apps can create them from your lecture PDFs; see our guide on turning a PDF into flashcards.

Built-in tools belong in this list too: Screen Time on iPhone and Digital Wellbeing on Android can limit apps and pause them on a schedule. They’re free and already on your phone, but easy to override. Our guide on blocking apps on iPhone and Android shows how to set them up.

The apps at a glance

As of October 2026. Plans and prices change often, so check the store listing before you subscribe. Braintoll is our app; for the others, we’ve described what their own pages and store listings say. Not studying? Our comparison of app blockers covers prices and permissions for everyday use.

Phone or laptop?

Most “best app blocker” lists mix both, but they’re different problems. If you study on a laptop and the distraction is the browser, you need a desktop blocker: Cold Turkey is the strictest for Windows and Mac, Freedom covers all your devices at once. If the distraction is the phone next to you, a phone app does the job. Many students need one of each.

Which blocker fits you

• You study in fixed blocks and want no discussion: a hard lock such as Opal, AppBlock or Freedom, scheduled for exactly those hours.
• You’re motivated by streaks and rewards: a focus timer such as Forest.
• Your problem is the reflexive open, not a lack of time: a pause such as one sec, or a study-to-unlock app.
• You have exam material to review anyway: a study-to-unlock app such as Braintoll, so every interruption turns into a few flashcards.
• You get distracted on the laptop: Cold Turkey or Freedom.

A study session setup that works

1. Silence everything. Turn on Do Not Disturb or a Focus mode for the session. This is the single change with the best evidence behind it.
2. Put the phone out of reach. In your bag or another room, so checking takes a decision instead of a reflex.
3. Block the two or three apps you open without thinking, only during your study hours.
4. Plan your breaks. Short, planned breaks (for example 5 minutes after 25 of work) keep you going longer than willpower does. Use them on purpose, not as an accident.
5. Make the remaining opens count. If you do reach for the phone, let it ask you a few exam questions first.

To decide what goes into each session, and when to review it, see how to make a study plan.

Why Braintoll works well for studying

Braintoll puts a few of your own flashcards in front of the apps you choose. Answer them, mark enough of them Easy, and the app opens for a set time. With active hours the toll only applies during your study hours, and your apps open normally the rest of the day. The cards come from your own material: write them, start from a preset, import an Anki deck, or let AI create them from your lecture notes. They’re scheduled with spaced repetition, so every toll reviews what you’re about to forget.

It’s not the right tool for everything. Braintoll doesn’t block anything on your laptop, and it always lets you leave with Keep my attention instead of locking you out. If you need a lock you can’t talk yourself out of, use a hard lock for the study block and Braintoll for the rest of the day. More apps that ask you to learn before you scroll are compared in Learn instead of scrolling.

Common questions

Do app blockers actually help you study?

They help with the part willpower handles badly: the quick, automatic check. They don’t make the material easier, but they remove the exits. They work best combined with silenced notifications and a phone that’s out of reach.

Is there a free app blocker for studying?

Yes. Screen Time on iPhone and Digital Wellbeing on Android are built in. ScreenZen is free, Cold Turkey has a free basic version for computers, and Braintoll, one sec, Opal and AppBlock have free plans with limits.

Can’t I just use Screen Time or Digital Wellbeing?

You can, and it’s a good start. Their weakness is that overriding them takes a tap, unless someone else sets the passcode. If you keep tapping past them, you need a blocker with more friction.

Which app blocker can’t be bypassed?

None is truly unbreakable, since you can always uninstall an app on your own phone. Strict modes such as Opal’s Deep Focus or Cold Turkey’s locked blocks come closest. In practice, a blocker you keep using beats a strict one you delete after a week.

Should I put my phone in another room while studying?

It helps, mainly because checking it then takes effort. The research on the phone’s mere presence is mixed, but the effect of notifications and frequent checking on concentration is well documented.

Braintoll is not affiliated with Cold Turkey, Freedom, Opal, AppBlock, Forest, one sec, ScreenZen, StudyLock, QuizLock or ScrollScholar. All product names are the property of their respective owners.