Comparison

The Great Lock vs Problem Logger

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

Head to head
About

The Great Lock

Features
Read full description

Welcome to The Great Lock-In - your companion for the scientifically-backed 120-day habit formation journey. Research shows it takes an average of 120 days to form a lasting habit. The Great Lock-In guides you through this transformative journey with powerful tools and daily motivation. KEY FEATURES: • 120-Day Challenge - Track your progress through the proven habit formation timeline • Multiple Habit Tracking - Build several positive habits simultaneously • Daily Check-ins - Stay accountable with quick, easy progress updates • Smart Reminders - Never miss a day with customizable notifications • Beautiful Analytics - Visualize your journey with insightful charts • Journal & Reflection - Document your thoughts and breakthroughs • Focus Mode - Dedicated sessions for deep work and productivity • Dark Mode - Easy on the eyes during evening check-ins • Data Export - Keep your progress safe with backup options WHY THE GREAT LOCK-IN? • Science-Based: Built on research showing 66 days for habit formation • Simple Yet Powerful: Clean interface that doesn't overwhelm • Privacy First: Your data stays on your device • One-Time Purchase: No subscriptions, lifetime access • Continuous Updates: Regular improvements and new features Whether you want to exercise daily, meditate, read more, or build any positive habit, The Great Lock-In provides the structure and motivation you need to succeed. Join people who have transformed their lives one day at a time. Your 66-day journey to lasting change starts now!

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.

Screenshots

The Great Lock4 screens
Problem Logger4 screens

Verdict

The call

The clearest difference is price: The Great Lock at $1.99 against Problem Logger's $9.99. The Great Lock also leads on iOS requirement (15.1 vs 18.6). On ads, in-app purchases and device support there is nothing between them.

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

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

The Great Lock costs $1.99 and Problem Logger $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Scorecard2 real differences Ā· 5 level
The Great Lock versus Problem Logger: the parameters behind the verdict, then further details
ParameterThe Great LockProblem Logger
Price$1.99 — better$9.99
Update frequencyDaily—
AdsNoNo
In-app purchasesNoNo
Monetization—Paid
DevicesiPhone, iPodiPhone, iPad
Requires iOS15.1 — better18.6
Further details — not scored
Size21 MB3 MB
Age rating4+4+
DeveloperSohail HussainThomas Richardson

In-app purchases

None

The Great Lock

No in-app purchases

None

Problem Logger

No in-app purchases

Questions

Is The Great Lock free?
The Great Lock costs $1.99, with no in-app purchases.
Is Problem Logger free?
Problem Logger costs $9.99, with no in-app purchases.
Do The Great Lock or Problem Logger have ads?
Neither The Great Lock nor Problem Logger shows ads.

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