Gut diary vs MoodLog
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Gut diary
Track your daily physical, psychological, and social activities to understand their impact on your gut health. Record bowel habits, diet, sleep, exercise, and even moments of happiness. Sync with health data to identify patterns and contributing factors to abdominal comfort.
- Bowel habit tracking
- Diet logging
- Sleep cycle monitoring
- Exercise recording
- Social activity logging
- Heart rate synchronization
- Abdominal pain and stool shape entry
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The stress or sleeping disturbance are closely associated with the changes in heart rate and result in affecting abdominal comfort, or bowel habits. “Gut diary” will help you lead healthier and happier life by tracking your physical, psychological, and social activities. You can record the daily bowel habits, diet, sleeping cycle, exercise and other social activity details on the app and synchronize with iPhone Health Kit or other wearable devices to obtain the heart rate data. By tracking your total daily activity, you maybe able to discover the certain pattern of abdominal conditions and identify the influence factor. You can also record a “little happiness” you have experienced during the day which can be a positive factor to your bowel activity. You have an easy access to the screen and can record several data at the same time. You can enter the abdominal pain and stool shape easily from Apple Watch. Please note that it is not possible to diagnose or treat someone with this application.
MoodLog
Easily log your daily mood, sleep, and physical condition. Track patterns with calendar and graph views. Customize what you record and set reminders to maintain consistency.
- Mood and sleep logging
- Calendar and graph visualization
- Customizable recording items
- Reminder function
- Dark mode support
- Search function
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This application allows you to easily record your mood and sleep. You can look back with a calendar and graph. Why don't you keep a record and check your pattern objectively? [Recommended when you...] are feeling down lately. having mood swings. are easily irritated. want to check your mood changes objectively. have an unstable sleep rhythm want to easily record your daily physical condition. want to keep track of what medications you’ve taken. want to check the relationship between mood, appetite and alcohol consumption. want to keep a diary or notes. [Recordable data] ・Morning, afternoon, and evening moods ・Sleep time ・Physical condition ・Medication ・Appetite ・Drinking ・Exercise ・Bathing ・Menstruation ・Memo [Settings menu] You can customize the items to be recorded, your mood, physical condition, etc. ・Items to be recorded ・Edit sleep time ・Edit mood ・Edit physical condition ・Reminder [Premium plan] Cat Mood Icons ad-free Touch ID / Face ID lock text output PDF output (Graphs by month. Available on iPhone with iOS 15 or later. ) [Other features] Easy search function Reminder function to prevent forgetting to input data No user registration required Dark mode support is easy on the eyes even in dark areas ---------------- License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is review sentiment: MoodLog at 80% against Gut diary's 17%. Gut diary's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price, update cadence 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. MoodLog sells 2 in-app purchases, starting at $2.49 per month. Gut diary asks for nothing beyond the download.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on July 28, 2026 and September 19, 2026 respectively.
| Parameter | Gut diary | MoodLog |
|---|---|---|
| Price | Free | Free |
| Rating | 3.5 (2 ratings) — better | — |
| Positive reviews | 16.7% of reviews | 80.0% of reviews — better |
| Number of ratings | 2 — better | — |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 53 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Keietsu Yasuhara | Mieko Komatsu |
Customer experience
Gut diary
MoodLog
In-app purchases
Gut diary
No in-app purchases
MoodLog
- Monthly Premium$2.491 Month
- Annual Premium$21.491 Year









