Kaizen
Pomodoro timer with an app blocker, habit tracker, to-do list and study rooms to focus with friends, no camera needed.
A startup from The Netherlands, founded by Max Kruiswegt.
Pomodoro timer with an app blocker, habit tracker, to-do list and study rooms to focus with friends, no camera needed.
A startup from The Netherlands, founded by Max Kruiswegt.
This page is designed to help you find out whether Kaizen is good and if it is the right choice for you.
Kaizen is a focus and study timer that combines a Pomodoro timer, an app blocker, a habit tracker, a to-do list and live study rooms in one app. It is free to use with no ads; a Premium subscription raises the free limits and adds extra features.
Timer: Pomodoro presets (25/5/15, 50/10/30 and more) or your own lengths, plus a stopwatch mode that counts up with no fixed end. Sessions keep running in the background, can be tagged (Study, Work, Reading and more) and feed daily, weekly and monthly statistics.
App blocker (iPhone, iPad and Android): blocks the apps you pick during focus sessions and opens them again on your breaks. On iPhone and iPad it uses Apple's Screen Time and can block websites too; on Android it uses Usage access, not an Accessibility service. An optional "Open anyway" button comes with a wait and a time limit you set.
Focus Rooms: virtual study rooms where you work alongside other people without a camera or microphone, shown as your avatar, with a live timer for everyone in the room. Join any room for free, or host a private room and invite up to 3 friends with a link to study together. With Premium you can host public or bigger rooms. Many people with ADHD use this kind of body doubling to get started and keep going.
Habits and tasks: check-off or timed habits with flexible schedules and forgiving streaks, and a task list with priorities, due dates, subtasks and reminders. A focus session can count toward a task or a habit.
Themes and focus music: dozens of backgrounds, including animated ones, and lo-fi, ambient, nature and white noise tracks saved for offline listening. Premium unlocks every theme and the full music library.
Tasks, habits and stats sync across iPhone, iPad, Android, Windows and the web.
Listed in
Pomodoro timer and stopwatch
Presets or your own lengths, plus a stopwatch that counts up
App Blocker
Blocks the apps you pick during focus sessions on iPhone, iPad and Android
Focus Rooms
Study alongside others with live timers, no camera or microphone
Habit Tracker
Check-off or timed habits with flexible schedules and forgiving streaks
To-do list
Priorities, due dates, subtasks and reminders; focus time counts toward each task
Focus music and themes
Lo-fi, ambient, nature and white noise tracks for offline listening, plus animated backgrounds
Statistics
Daily, weekly and monthly focus totals, charts by hour, weekday and tag
Cross-platform sync
Tasks, habits and stats sync across iPhone, iPad, Android, Windows and the web
Kaizen puts everything a focus session needs in one app: a Pomodoro timer and stopwatch, an app blocker, a habit tracker, a to-do list and live Focus Rooms, where you study alongside other people without a camera or microphone. Focus time counts toward your tasks and habits automatically, so planning, focusing and tracking happen in one place.
Most focus apps do one job: a timer, a blocker, or a video co-working session. Kaizen combines them, runs on iPhone, iPad, Android, Windows and the web with sync between them, and has no ads. The free version already covers the core: the timer and stopwatch, blocking up to 3 apps, up to 5 habits, and joining any Focus Room. Focus Rooms need no camera, which makes body doubling easier for people who find video calls draining.
Students studying for exams, remote workers and freelancers who need time for deep work, and people with ADHD who focus better with structure and the quiet company of others. Anyone who reaches for their phone when they should be focusing.
One TypeScript codebase in React Native with Expo for iPhone, iPad, Android, Windows and the web, with Supabase for accounts and sync. App blocking uses Apple's Screen Time on iPhone and iPad, and Android's Usage access on Android.
Kaizen started as a Discord study community, where thousands of students kept each other company while they worked. In 2023 I built a bot for it with a Pomodoro timer, study-time tracking and leaderboards, and watching people focus better just because someone else was there became the idea behind Focus Rooms. In 2025 the community became Kaizen, and that September I started building the app it had been asking for. It launched on Google Play and the web in January 2026, then on iPhone, iPad and Windows in May. It is still built and run by one developer in the Netherlands, and every support email and feature request lands with me.
We have collected here some useful links to help you find out if Kaizen is good.
Check the traffic stats of Kaizen on SimilarWeb. The key metrics to look for are: monthly visits, average visit duration, pages per visit, and traffic by country. Moreoever, check the traffic sources. For example "Direct" traffic is a good sign.
Check the "Domain Rating" of Kaizen on Ahrefs. The domain rating is a measure of the strength of a website's backlink profile on a scale from 0 to 100. It shows the strength of Kaizen's backlink profile compared to the other websites. In most cases a domain rating of 60+ is considered good and 70+ is considered very good.
Check the "Domain Authority" of Kaizen on MOZ. A website's domain authority (DA) is a search engine ranking score that predicts how well a website will rank on search engine result pages (SERPs). It is based on a 100-point logarithmic scale, with higher scores corresponding to a greater likelihood of ranking. This is another useful metric to check if a website is good.
The latest comments about Kaizen on Reddit. This can help you find out how popualr the product is and what people think about it.
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Is Kaizen good? This is an informative page that will help you find out. Moreover, you can review and discuss Kaizen here. The primary details have been verified within the last quarter. So they could be considered up to date. If you think we are missing something, please use the means on this page to comment or suggest changes. All reviews and comments are highly encouranged and appreciated as they help everyone in the community to make an informed choice. Please always be kind and objective when evaluating a product and sharing your opinion.
