Comparison

Problem Logger vs Koku

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

Head to head
About

Problem Logger

Easily log and track recurring issues over time with a private, dated timeline. Ideal for recording symptoms, home repairs, or any situation where knowing when an event occurred is important. Keep your records secure and local on your device.

Highlights
  • Create dated timelines of events
  • Log incidents in seconds
  • Set optional reminders
  • Review timelines over days/weeks/months
  • Local device storage
  • App lock for privacy
Features
Read full description

Problem Logger helps you keep a simple, private record of things that happen over time. Create a problem, tap Log Now, and build a dated timeline. It works for recurring pain, noisy neighbours, home repair issues, car faults, workplace incidents, care notes, or any situation where knowing when something happened is useful. Why people use Problem Logger: • Keep a dated timeline of recurring or occasional problems • Record when something happened in seconds • Set optional reminders so you remember to check in • Review your timeline over days, weeks, or months • Keep records local on your device • Use Face ID or Touch ID app lock for extra privacy Useful for: • Symptoms, pain, sleep issues or side effects • Noise, neighbour or nuisance records • Landlord, home repair or maintenance problems • Vehicle, appliance or device faults • Workplace incidents or recurring concerns • Pet, family or care-related observations • Any problem where a clear record helps Problem Logger is flexible. It is not limited to one type of problem and does not force you into a medical, legal, or complaint workflow. Start with a timestamp and build a clear personal record over time. Privacy first: • No account required • Logs are stored locally on your device • App lock support is available Problem Logger does not provide medical, legal, or professional advice. It helps you keep a personal record that you can review when needed.

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.

Screenshots

Problem Logger4 screens
Koku4 screens

Verdict

The call

The clearest difference is price: Koku at Free against Problem Logger's $9.99. Problem Logger's advantage is iOS requirement (18.6 vs 26.4). On ads, in-app purchases 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

Koku is free to download; Problem Logger costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scorecard3 real differences · 6 level
Problem Logger versus Koku: the parameters behind the verdict, then further details
ParameterProblem LoggerKoku
Price$9.99Free — better
Rating—3.0 (1 ratings) — better
Number of ratings—1 — better
Update frequency—Every 3 days
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, Apple Watch
Requires iOS18.6 — better26.4
Further details — not scored
Size3 MB10 MB
Age rating4+4+
DeveloperThomas RichardsonRodolfo Alberto Lopez Terriquez

In-app purchases

None

Problem Logger

No in-app purchases

None

Koku

No in-app purchases

Questions

Is Problem Logger free?
Problem Logger costs $9.99, with no in-app purchases.
Is Koku free?
Koku is free to download, with no in-app purchases.
Do Problem Logger or Koku have ads?
Neither Problem Logger nor Koku shows ads.

Other comparisons