Comparison

Koku vs Flow

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

Flow

Features
Read full description

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

Koku4 screens
Flow4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Flow sells 3 in-app purchases, starting at $1.99 per month. Koku asks for nothing beyond the download.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 6 level
Koku versus Flow: the parameters behind the verdict, then further details
ParameterKokuFlow
PriceFreeFree
Rating3.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 3 days — betterEvery 5 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, Apple WatchiPhone, iPad, Apple Watch — better
Requires iOS26.417.2 — better
Further details — not scored
Size10 MB11 MB
Age rating4+4+
DeveloperRodolfo Alberto Lopez TerriquezNeerav Kothari

In-app purchases

None

Koku

No in-app purchases

3 purchases

Flow

Subscriptions2
  • Monthly Pro7 Days trial$1.991 Month
  • Yearly Pro7 Days trial$14.991 Year
One-time1
  • Weekly Pass$0.99

Questions

Is Koku free?
Koku is free to download, with no in-app purchases.
Is Flow free?
Flow is free to download, with in-app purchases available.
Do Koku or Flow have ads?
Neither Koku nor Flow shows ads.
Which is updated more often, Koku or Flow?
Koku ships an update every 3 days, and Flow every 5 weeks. Most recently, Koku was updated on October 31, 2026 and Flow on November 5, 2026.

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