Koku vs Flow
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Koku
This app helps you focus on tasks with customizable work and rest intervals. It offers a simple, distraction-free interface and integrates with your home screen and Apple Watch for easy access and control. Enjoy deep work without accounts, streaks, or subscriptions.
- Customizable focus and rest sessions
- Classic Pomodoro rhythm option
- Home Screen widget for quick access
- Live Activities on lock screen
- Apple Watch companion app
- Minimalist, distraction-free design
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Koku is a focus timer for deep work. Focus. Rest. Repeat. Set your own session lengths or use the classic rhythm - twenty-five minutes of focus, five minutes of rest, a longer break every four sessions. Each minute is a dot. Watch them fill. - No accounts. - No streaks. - No subscriptions. Just time, and the work in front of you. Add Koku to your Home Screen for quick access - start, pause, and skip sessions right from the widget. Keep the timer visible on your lock screen with Live Activities. Koku also includes an Apple Watch companion app that works with the iPhone app, so you can check your timer and control sessions from your wrist. Designed for iPhone, with an Apple Watch companion. Light and dark mode. Works in any language. Koku (刻) is the Japanese word for a moment of time.
Flow
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Make space for deep focus with a timer that adapts to the way you work. Flow is a calm, flexible focus system for work, study, reading, writing, meditation, and everything in between. Create routines that fit your day, keep the countdown visible across your Apple devices, and turn each completed session into useful progress. FOCUS YOUR WAY - Create custom timers with your own name, icon, color, focus duration, break length, and rounds - Build Pomodoro-style routines for deep work, study sessions, reading, writing, or mindful breaks - Pause, skip, restart, or stop a session whenever your plans change - Choose light or dark appearance to match your space STAY FOCUSED EVERYWHERE - Follow your session from iPhone, iPad, and Apple Watch - Keep the timer close with widgets, Dynamic Island, and Live Activities - Choose focus music and control Apple Music playback without leaving the timer SEE YOUR PROGRESS - Earn reward points and build streaks as sessions add up - Compare routines and review focus time, completion patterns, and your most productive hours - Use Focus Coach for practical guidance based on your focus history - Compare Flow focus time with Apple Health mindful-minute summaries REFLECT AND IMPROVE - Record your mood and distractions after a session - Add a short note about what worked or what got in the way - Search your history by routine, note, or date - Return to past sessions to spot patterns and make your next focus block better FLOW PRO only for $0.99 for Lifetime! Unlock Extensions, unlimited Custom Timers, the full History archive, advanced Insights, Focus Coach, Apple Health comparison, and Apple Music controls, Widgets, Live activity, Dynamic Island. Whether you are protecting time for a demanding project, studying for an exam, reading without distraction, or building a steadier daily rhythm, Flow gives you a clear place to begin. Find your flow, one focused session at a time. https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Koku at none against Flow's 3. Koku also leads on update cadence (every 3 days vs every 5 weeks). Flow's advantage is iOS requirement (17.2 vs 26.4). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Flow sells 3 in-app purchases, starting at $1.99 per month. Koku asks for nothing beyond the download.
Koku ships an update every 3 days, Flow every 5 weeks. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.
| Parameter | Koku | Flow |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 days — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, Apple Watch | iPhone, iPad, Apple Watch — better |
| Requires iOS | 26.4 | 17.2 — better |
| Further details — not scored | ||
| Size | 10 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Rodolfo Alberto Lopez Terriquez | Neerav Kothari |
In-app purchases
Koku
No in-app purchases
Flow
- Monthly Pro7 Days trial$1.991 Month
- Yearly Pro7 Days trial$14.991 Year
- Weekly Pass$0.99









