Deep work is not a tooling problem. Almost nobody fails at concentrating because they lacked an app.
But if you already know what you should be doing and your hand keeps reaching for the phone anyway, a tool that puts something physical between you and the reflex is worth more than another article about willpower.
Here are ten, grouped by what’s actually going wrong.
How this list is sourced
I have not run all ten of these for a month each, and you should be sceptical of any blog that claims it has.
What I have done is verify what’s checkable. Every developer name, star rating and rating count below was pulled from the US App Store on 11 August 2026. Behaviour descriptions come from each app’s own store listing and documentation.
Prices are not in the comparison table. Every iOS app here is free to download and charges through a subscription that shifts by region and promotion. Any number written into a blog post is wrong within months. Open the store listing and read the current price before you commit to anything.
There are no star scores of my own on this page. The only ratings shown are Apple’s.
Two corrections this article used to get wrong
An earlier version of this page recommended Centered at $15/month. As of 11 August 2026 there is no Centered listing in the US App Store, and the company behind it now appears under a different name. I’ve removed it rather than leave you a dead recommendation dressed up as a 2026 pick. If you see Centered on a “best of 2026” list, that list has not been checked.
The same version described Opal as iPhone only. It isn’t. Opal’s own site lists iPhone, Mac and Android.
What deep work actually means
Cal Newport’s 2016 book Deep Work is where most people meet the term. His framing: professionally demanding work done in a state of distraction-free concentration, the kind that creates real value and is hard to copy.
The useful part isn’t the definition, it’s the contrast. Deep work is the opposite of the shallow, interruptible, easily-replicated work that fills most calendars by default. Apps can’t make work meaningful. They can only defend the block of time you’ve already decided to spend on it.
Work out which problem you have
Three different failures get treated as one, and each needs a different tool.
- You know what to do, you just drift → a timer and a defined task
- You’re on autopilot, already scrolling before you decided to → a friction app
- You genuinely cannot stop once you start → a hard blocker
Buying a blocker when you needed a timer is how people end up with five focus apps and no focus.
Quick comparison
Developers, ratings and rating counts verified on the US App Store, 11 August 2026.
| App | Developer | Rating | Ratings | Approach |
|---|---|---|---|---|
| Opal: Screen Time Control | OPAL OS CORPORATION | 4.7 | 85,634 | Hard blocking |
| Freedom: Screen Time Control | Eighty Percent Solutions | 4.4 | 5,675 | Blocking across devices |
| Refocus: Block Apps & Websites | Labi, LLC | 4.8 | 10,780 | Blocking |
| one sec | riedel.wtf apps S.L. | 4.8 | 23,330 | Friction before opening |
| ScreenZen | ScreenZen LLC | 4.9 | 47,105 | Friction, free |
| Jomo | Jomo | 4.8 | 2,289 | Friction and schedules |
| Forest: Focus for Productivity | SEEKRTECH CO., LTD. | 4.8 | 48,942 | Gamified timer |
| Session Pomodoro Focus Timer | Translucent LLC | 4.8 | 363 | Plain pomodoro |
| Focus To-Do | Shenzhen Tomato Software | 4.8 | 14,534 | Timer plus tasks |
| Brain.fm | BrainFM, Inc. | 4.5 | 5,341 | Focus audio |
Cold Turkey Blocker is covered below and isn’t in the table, because it isn’t an App Store product and has no Apple rating to quote.
If you need an actual lock
Opal — 4.7 stars, 85,634 ratings
The 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 your distraction moves to the laptop the moment the phone is locked down.
One honest caveat, which applies to everything in this section: no iOS blocker is truly unbypassable. A determined person gets round any of them. The value is making the detour annoying enough that the impulse passes, and anyone selling you an unbreakable lock is overselling.
Freedom — 4.4 stars, 5,675 ratings
From Eighty Percent Solutions. The differentiator is one blocklist enforced across phone, tablet and computer at the same time. Closing Instagram on your phone while it’s one tab away on your laptop is not blocking, it’s theatre.
Lowest star average in this list. Read recent reviews before subscribing.
Refocus — 4.8 stars, 10,780 ratings
From Labi, LLC. App and website blocking with a stronger rating than Freedom on roughly double the ratings, and worth checking as the direct alternative if you only need one device covered.
Cold Turkey Blocker — Windows and macOS only
Not on the App Store, so there’s no rating to quote. Still the most severe option on desktop, with scheduled and locked blocks on sites and applications. There is no mobile version, so it solves half your problem and you’ll need something on the phone as well.
Worth knowing about because most focus tooling ignores the desktop entirely, which is where the work actually happens.
If the problem is reflex, not willpower
These don’t block anything. They put a deliberate pause between the reflex and the payoff: you tap Instagram, something makes you wait a few seconds and confirm you meant it. A lot of the time you didn’t, and you close it.
This is the right category for far more people than think it is. If you don’t feel like you’re resisting an urge, because you’re already scrolling before you noticed deciding to, blocking is the wrong tool and friction is the right one.
one sec — 4.8 stars, 23,330 ratings
From riedel.wtf apps S.L. The app that popularised the approach. A breath-length delay before a chosen app opens, then a prompt asking whether you still want to continue.
ScreenZen — 4.9 stars, 47,105 ratings
Highest-rated app on this page, across 47,105 ratings, and free. Configurable pauses, intention prompts and limits.
Start here if you want to test whether friction works on you without paying anything.
Jomo — 4.8 stars, 2,289 ratings
Friction plus scheduling, for people who want rules that apply at set times rather than a permanent blanket. Smallest rating count of the three.
If you respond to gamification
Forest — 4.8 stars, 48,942 ratings
From SEEKRTECH. Plant a tree, stay in the app, watch it grow. Leave early and it dies.
Correction worth flagging: Forest is regularly described as a paid upfront app. As of 11 August 2026 it is free to download, with paid features on top. “It costs money” is no longer a reason to skip it.
The real limitation is that Forest blocks nothing. It’s a promise, not a lock, and the guilt has a shelf life. The first dead tree stings. The fortieth doesn’t.
If you just need a timer
Most people reading a deep work article need this row and buy from the row above it.
Session — 4.8 stars, 363 ratings
From Translucent LLC. Clean pomodoro with session tracking and intention setting. Note the small rating count: it’s less battle-tested than everything else here.
Focus To-Do — 4.8 stars, 14,534 ratings
From Shenzhen Tomato Software. Pomodoro timer with task management attached, so the timer is tied to a specific thing rather than to a vague block of “work”.
Also worth knowing: Be Focused – Deep Focus Timer (Denys Ievenko, 4.7 stars, 4,317 ratings, free, with a separate Be Focused Pro listing at $19.99), Flow: Focus & Pomodoro Timer (Yugen GmbH, 4.8 stars, 1,738 ratings) and Focus – Deep Work Timer (Meaningful Things, 4.4 stars, 1,821 ratings).
If silence doesn’t work for you
Brain.fm — 4.5 stars, 5,341 ratings
Generated audio designed for focus sessions rather than a playlist. The company publishes its own research; treat vendor-run studies on a vendor’s product the way you’d treat any other marketing, which is to say try the trial and see whether it does anything for you.
Endel (Endel Sound GmbH, 4.6 stars, 33,429 ratings) is the larger alternative in this category by rating count.
I’m not going to tell you focus audio is scientifically proven. Some people concentrate better with sound, some can’t stand it, and no app knows which one you are.
The awkward questions
Will any of these stop me if I really want to be stopped? No. Every iOS blocker can be undone. They buy you the ten seconds in which the urge usually passes. That’s genuinely useful and it is not the same as being locked out.
Does the block follow me to my laptop? Only Freedom, Opal and Cold Turkey take other platforms seriously. Everything else is phone-only, which means the distraction just moves.
Can I get my data out? Basically no. Focus stats, streaks and forests are locked to the app that made them. Switching apps means starting the history at zero, and that sunk cost is the single most common reason people stay with a tool that stopped working.
Do I need to pay? Not to find out whether this approach works. ScreenZen is free and Forest is free to download. Prove the mechanic works on you before you subscribe to anything.
Deep work habits that don’t need an app
- Schedule it. “When I feel like it” means never.
- Define the task before you start the timer. “Work on the report” is not a task. “Draft the second section” is.
- Start at 25 minutes and extend only once you’re finishing them.
- Put the phone in another room. Face-down on the desk is not another room.
- Same slot every day. Habit does the work that willpower keeps failing at.
- One tab.
FAQ
What’s the best free deep work app? ScreenZen. 4.9 stars across 47,105 ratings, free, and it targets the reflex rather than relying on you to resist it.
How long should a deep work session be? Start at 25 minutes. Many people settle between 50 and 90. The right length is the longest one you actually finish without bailing, and that is personal.
How many hours of deep work per day is realistic? There’s no credible universal number, and anyone quoting one at you is usually quoting a blog quoting a blog. What’s true is that it’s bounded, it’s tiring, and it’s a smaller fraction of the workday than most people assume. Measure your own for two weeks instead of trusting an average.
Can an iPhone app really stop me opening Instagram? Not absolutely. Every one of them can be undone by someone determined. They add enough friction that the impulse usually passes, which is often enough and occasionally isn’t.
Is Forest still worth it? If the mechanic works on you, yes, and it’s free to download so testing costs nothing. The reason to leave is that the guilt stopped landing, not that it’s expensive.
Which one blocks on my laptop too? Freedom or Opal for cross-device, Cold Turkey Blocker for the strictest desktop-only option.
Related reads:
- Pomodoro Technique: The Complete Guide — the method behind the timers
- Pomodoro Timer Apps Compared — timer-specific reviews
- Deep Work Timer: Structure Your Sessions — how to plan the block
- 9 Forest App Alternatives — if the tree stopped working
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 ranked section, in the “how to choose” guidance, or in a single FAQ answer above. That’s deliberate: I compete with these apps, so scoring them against my own product is not a test worth your trust. If the “just need a timer” section describes you, it’s an option alongside Session, Focus To-Do and Be Focused. 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
- App names, developers, ratings and rating counts: US App Store via the iTunes Search API, 11 August 2026.
- Opal platform availability: opalapp.com, checked 11 August 2026.
- Cold Turkey Blocker platform availability: getcoldturkey.com, checked 11 August 2026.
— Dolce
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