Textbook open. Phone face-down. Forty-five seconds later you’re three TikToks deep with no memory of picking it up.

That last part matters more than it sounds. You didn’t decide to stop studying. Your hand moved before the decision happened, which is why “just have more discipline” keeps failing you.

Here are nine apps, grouped by which part of that actually breaks for you.

How this list is sourced

I have not run nine apps through a semester, and neither has any other blog that says it has.

What I have done is verify the checkable parts. Every developer name, star rating and rating count below was pulled from the US App Store on 11 August 2026. Descriptions of how the apps behave come from their own store listings and documentation.

No prices in the comparison table. Every iOS app here is free to download and charges through a subscription or unlock that changes by region and promotion. Any figure typed into a blog post is stale within months, and as a student you should be checking the current price on the listing anyway.

No star scores of my own. The only ratings on this page are Apple’s.

You’ve seen the line: the average student checks their phone 150 times a day. Or 96. Or 344. Every version of that claim traces back to a phone-company marketing survey, and the number changes depending on who’s selling what.

So this article isn’t going to quote one. You don’t need a statistic to know you pick up your phone too much. You have the Screen Time report.

The one piece of real research worth knowing is about what interruptions cost. Gloria Mark and colleagues at UC Irvine studied information workers being interrupted at work and published The Cost of Interrupted Work: More Speed and Stress at CHI 2008. What that paper reports is not the number everybody repeats: interrupted people finished tasks faster, but reported more stress, more frustration, higher effort and more time pressure.

The famous “every interruption costs 23 minutes and 15 seconds to refocus” figure comes from Mark’s fieldwork and her talks, not as a headline result you can point to in that paper. It gets quoted as gospel by people who have never opened it. Treat it as a rough order of magnitude, not a law of physics.

The honest takeaway survives either way: interruptions are expensive, and the cost shows up as stress and effort rather than as obvious lost minutes.

Work out which problem you have

Three different failures, three different tools. Buying the wrong one is why people end up with five focus apps and no focus.

  • You sit down and drift → you need a timer and a defined task
  • You study fine alone but never start → you need accountability or group pressure
  • You physically cannot stay off the app → you need a blocker or a friction app

Quick comparison

Developers, ratings and rating counts verified on the US App Store, 11 August 2026.

AppDeveloperRatingRatingsApproach
Opal: Screen Time ControlOPAL OS CORPORATION4.785,634Blocking
Flora – Green FocusAppFinca Inc.4.882,435Trees, friends, stakes
Forest: Focus for ProductivitySEEKRTECH CO., LTD.4.848,942Gamified timer
ScreenZenScreenZen LLC4.947,105Friction, free
one secriedel.wtf apps S.L.4.823,330Friction before opening
Study Bunny: Focus TimerJustin Patrick Silang4.721,056Study timer, rewards
Focus To-DoShenzhen Tomato Software4.814,534Timer plus tasks
Focus Tree: Timer & FlashcardsFocus Labs4.75,585Timer plus flashcards
Focus PlantShikudo Co., Ltd.4.75,402Trees plus blocking

Cold Turkey Blocker is covered below and is not in the table, because it isn’t an App Store product and has no Apple rating to quote.

If you need a timer and a defined task

Focus To-Do — 4.8 stars, 14,534 ratings

From Shenzhen Tomato Software. Pomodoro timer with a task list attached, so the session is tied to a specific thing rather than to a vague block called “study”.

This matters more than it sounds. “Study for two hours” is not a task and you will not finish it. “Work through problems 4 to 12” is a task and you will know when you’re done.

Study Bunny: Focus Timer — 4.7 stars, 21,056 ratings

From Justin Patrick Silang. Built specifically for students: study timer, subject tracking, and a rewards loop where session time buys things for a cartoon rabbit.

Note the last update on the listing is from December 2024, which is older than everything else here. That’s not automatically a problem, but check recent reviews before you commit a semester to it.

Focus Tree: Timer & Flashcards — 4.7 stars, 5,585 ratings

From Focus Labs. Combines a focus timer with flashcards, which is a genuinely student-shaped feature that general productivity apps don’t have. Smallest rating count in the table.

If starting is the problem, not focusing

Flora – Green Focus — 4.8 stars, 82,435 ratings

From AppFinca. Second-most-rated app on this page. Same grow-a-plant loop as Forest, with two additions that matter for students: you can run a session with friends so everyone’s plant dies if anyone bails, and you can attach a real money stake.

Group sessions are the actual feature here. Studying with three people who will all lose their tree if you open Instagram is a different psychological situation from studying alone.

Forest: Focus for Productivity — 4.8 stars, 48,942 ratings

From SEEKRTECH. The original version of this mechanic. Plant a tree, stay in the app, it grows; leave early and it dies.

Correction worth flagging: Forest is still described all over the internet as a paid upfront app. As of 11 August 2026 it is free to download on the App Store, with paid features on top.

The honest limitation is that Forest blocks nothing. You can leave whenever you like. It’s a promise you make to yourself with a cartoon attached, and the guilt has a shelf life — the first dead tree stings, the fortieth doesn’t.

Focus Plant — 4.7 stars, 5,402 ratings

From Shikudo. The plant-growing loop paired with actual app blocking rather than relying on your conscience. Middle ground between the cute version and the strict version.

If you genuinely cannot stay off the apps

ScreenZen — 4.9 stars, 47,105 ratings

Highest-rated app on this page, across 47,105 ratings, and free. Instead of blocking, it puts a pause and an intention prompt between you and the app. You tap Instagram, something makes you wait and confirm you meant it, and a lot of the time you didn’t.

Start here. It costs nothing, and if friction works on you, you’ve solved the problem without a subscription.

one sec — 4.8 stars, 23,330 ratings

From riedel.wtf apps. The app that popularised the friction approach: a breath-length delay before a chosen app opens, then a prompt asking whether you still want to continue.

Pick this over a blocker if you don’t feel like you’re resisting an urge, because you’re already scrolling before you noticed deciding to. That’s a reflex problem, and blocking is the wrong tool for it.

Opal — 4.7 stars, 85,634 ratings

Most-rated app on this page. Scheduled blocking sessions, app and site blocking, screen time reporting. Available on iPhone, Mac and Android per Opal’s own site, which matters if the distraction just relocates to your laptop the second the phone is locked down.

The caveat every article about Opal should print and doesn’t: no iOS blocker is unbypassable. Not this one, not any of them. A determined person gets round all of them, and anyone claiming otherwise is selling something. What a blocker buys you is a detour annoying enough that the impulse passes. That’s genuinely useful, and it is not the same as being locked out.

Cold Turkey Blocker — Windows and macOS only

Not on the App Store, so there’s no rating to quote. The most severe option on a laptop: scheduled and locked blocks with a free tier covering websites, and application blocking in the paid version.

Read this bit carefully, because most roundups get it wrong: Cold Turkey blocks desktop applications, and there is no mobile version at all. It solves the essay-writing half of your problem and does nothing about your phone. Check the current pricing on getcoldturkey.com rather than trusting a figure in a blog post.

Free options that genuinely work

  • ScreenZen — free, 4.9 stars, and the strongest free option here
  • Forest — free to download, paid features optional
  • iOS Screen Time — already on your phone, no download, easy to override
  • Cold Turkey Blocker free tier — website blocking on your laptop
  • Study Bunny and Focus To-Do — both free to download

That combination costs nothing and covers phone, laptop and session timing. Prove the approach works on you before you pay for anything, especially on a student budget.

Study session blueprint

Before

  1. Phone in another room. Not face-down, not in a drawer. Another room.
  2. One task written down, specific enough that you’ll know when it’s finished.
  3. Timer started.

During 4. Work until the timer ends. If you get interrupted, note where you were before dealing with it — that note is what saves you the refocusing cost. 5. No “quick checks”. There is no such thing.

Breaks 6. Five to ten minutes, away from the desk. 7. Not on your phone. This is where the whole system dies.

After 8. Log what you finished, not how long you sat there. 9. Decide tomorrow’s first task now, while you still remember where you stopped.

The honest truth

Apps can’t study for you.

A student with a kitchen timer and their phone in another room will out-study a student with five concentration apps who keeps granting themselves exceptions. Every one of these tools is a supplement to a decision you have already made. None of them makes the decision.

If you install one thing from this page, make it the free one, and put the phone in another room while you’re at it.

FAQ

What’s the best free concentration app for students? ScreenZen. 4.9 stars across 47,105 ratings, free, and it targets the reflex rather than relying on willpower you’ve already run out of.

What if I study better with friends? Flora. Group sessions where everyone’s plant dies if one person quits, plus optional money stakes. 4.8 stars across 82,435 ratings.

How long should a study session be? Start at 25 minutes. Work up as you go. The right length is the longest one you actually finish, which is personal and not something a blog can tell you.

How do I stop checking my phone? Physically remove it. Different room. Everything else on this page is a distant second to that.

Can any app really stop me opening Instagram? Not absolutely. Every iOS blocker can be undone. They add enough friction that the urge usually passes, which is often enough and occasionally isn’t.

Do these work for ADHD? Some people find them helpful and some find them useless. This is a question for someone qualified who knows your situation, not for an app roundup.

Do I lose my streaks if I switch apps? Yes. Focus stats, forests and study logs don’t transfer anywhere. Every switch starts you at zero, which is the main reason people stay with an app that stopped working for them.

Related reads:

Disclosure: FocusTimer is mine

I build iOS apps, and FocusTimer is one of them — a plain pomodoro timer with no gamification.

It does not appear in the comparison table, in any of the ranked sections, in the free options list, or in a single FAQ answer above. That’s deliberate: I compete with these apps, so scoring them against my own product isn’t a test you should trust. If the “timer and a defined task” section describes you, it’s an option alongside Focus To-Do and Study Bunny. It is new and has very few App Store ratings so far, so there is not much of a crowd verdict to lean on either. Try it and judge for yourself.

Sources

— Dolce