Comparison

Open Working Hours vs Koku

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

Head to head
About

Open Working Hours

Features
Read full description

Track hours automatically. Improve working conditions. Open Working Hours helps healthcare workers document actual working hours easily β€” and make structural problems visible. Overwork in healthcare is well known, but rarely documented. Without independent data, there's no foundation for change. Open Working Hours gives you a private record of your hours, and lets you contribute anonymously to aggregated statistics that show what working conditions actually look like across hospitals and specialties. Tracking shouldn't be an additional burden. Automatic clock-in/out via geofencing as you arrive at and leave your workplace, or log shifts manually in seconds with reusable templates. Built for hospital life: fast, reliable, low-friction. Creates transparency Plan your shifts, track what actually happens, see overtime at a glance over 14 days. When you choose to contribute a confirmed week, it joins anonymized, aggregated statistics at the institutional level β€” turning isolated experience into a shared picture of working conditions. Privacy from the start Daily shift detail, your calendar, and location data stay on your device. Geofencing detection runs locally. Optional workplace search uses Photon (Komoot, Germany). Only aggregated statistics are ever published, and only when at least 5 people contribute to the same group (k-anonymity), with additional statistical noise to protect against re-identification. No employer access. EU-only infrastructure for hosting, email, and geocoding β€” optional Apple/Google sign-in is the only US touchpoint, under EU adequacy. No analytics SDKs. No advertising. No third-party trackers. GDPR compliant. Delete your data anytime. For healthcare workers Designed with and for doctors, nurses, midwives, and other healthcare workers. Use it solo from day one β€” your contributions become statistically meaningful as more colleagues join. Free. Non-commercial. Learn more: openworkinghours.org

About

Koku

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.

Screenshots

Open Working Hours4 screens
Koku4 screens

Verdict

The call

The clearest difference is update cadence: Koku at every 3 days against Open Working Hours's weekly. Open Working Hours's advantage is iOS requirement (15.1 vs 26.4). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Open Working Hours ships an update weekly, Koku every 3 days. The most recent releases landed on September 11, 2026 and July 22, 2026 respectively.

Scorecard2 real differences Β· 4 level
Open Working Hours versus Koku: the parameters behind the verdict, then further details
ParameterOpen Working HoursKoku
PriceFreeFree
Update frequencyWeeklyEvery 3 days β€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, Apple Watch
Requires iOS15.1 β€” better26.4
Further details β€” not scored
Size37 MB4 MB
Age rating4+4+
DeveloperLukas HondrichRodolfo Alberto Lopez Terriquez

In-app purchases

None

Open Working Hours

No in-app purchases

None

Koku

No in-app purchases

Questions

Is Open Working Hours free?
Open Working Hours is free to download, with no in-app purchases.
Is Koku free?
Koku is free to download, with no in-app purchases.
Do Open Working Hours or Koku have ads?
Neither Open Working Hours nor Koku shows ads.
Which is updated more often, Open Working Hours or Koku?
Open Working Hours ships an update weekly, and Koku every 3 days. Most recently, Open Working Hours was updated on September 11, 2026 and Koku on July 22, 2026.

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