# Mood, Sleep & Symptom Tracker — Sleep, energy, pain patterns > Private mood and symptom tracker that finds patterns in your health data. (iPhone/iPad app by Hyun Sik Kim.) - Source: https://appshunter.io/ios/app/mood-sleep-and-symptom-tracker/id6759892880 (this page in markdown: same URL + `.md`) - Developer: [Hyun Sik Kim](https://appshunter.io/developer/1871784166) - Category: Health & Fitness, Medical - Price: Free with in-app purchases - Rating: 5.00/5 from 2 App Store ratings - Age rating: 4+ - Requires: iOS 15.1 · 41 MB - Languages: English - Released: 2026-06-16 - Data updated: 2026-08-11 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/mood-sleep-and-symptom-tracker/id6759892880/reviews.md ## What is Mood, Sleep & Symptom Tracker? See your days in context. Meridian is a private daily journal for noticing patterns across mood, sleep and everyday body signals. A quick check-in builds a calendar you can look back on, while on-device analysis compares your own entries over time. LOG EIGHT DAILY SIGNALS Record mood, sleep, energy, focus, stress, headache, digestion and exercise in one calm check-in. The fixed set keeps each day consistent, so your history remains easy to compare. Optional reminders can help you remember when you choose to log. LOOK BACK WITHOUT GUESSING Use the calendar and history to revisit individual days and see how each signal changed. Trend views turn separate entries into a clearer timeline while keeping the underlying values visible. NOTICE ASSOCIATIONS Meridian aligns signals by calendar day and uses an exploratory statistical screen based on permutations before highlighting a relationship. For example, it may show that lower energy often appears after shorter sleep in your own entries. An association is not proof that one signal caused another, and Meridian does not present it as one. When the data is limited, the app says so. MERIDIAN PRO Pro unlocks the full association network, next-day estimates checked on held-out earlier entries when your history is sufficient, 60- and 90-calendar-day trend ranges, and export to a real JSON file. Estimates stay hidden unless they outperform a simple baseline in those historical checks. You decide where an exported file goes. PRIVATE BY DESIGN Your daily health entries and their analysis stay on your device. Meridian uses RevenueCat for purchase validation, entitlements and aggregate purchase analytics. That purchase history is not linked to your identity or used to track you. Your journal entries, health signals and on-device analysis are never sent to RevenueCat. Meridian is designed for personal reflection. It does not diagnose conditions, provide treatment guidance or replace professional medical advice. Made by Studio AM for iPhone and iPad. ## Key features - Track mood, sleep, energy, and symptoms - Identify patterns and correlations - Private health journal on device - Quick daily check-in - View historical health trends - Customizable symptom tracking ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Meridian Pro | $9.99 | one-time | ## Frequently asked questions about Mood, Sleep & Symptom Tracker ### What can I track with Meridian? Meridian allows you to track your mood, sleep quality, energy levels, and physical symptoms like headaches or pain. You can also add custom signals that matter to you for personalized tracking. ### How does Meridian help me understand my health? Meridian connects your logged data to reveal patterns and correlations, such as how sleep affects your energy or what triggers your low mood. This insight helps you understand what influences your wellbeing without manual analysis. ### Is Meridian private and secure? Yes, Meridian is designed for privacy. Your health journal stays on your device, requiring no account and collecting no data. It is also ad-free, ensuring your information is not harvested. ### How often do I need to use Meridian? Meridian offers a gentle, quick daily check-in, designed to be non-intrusive. It focuses on providing long-term insights rather than demanding constant attention or maintaining streaks. ### What devices does Meridian support? Meridian is available for iPhone and iPad, supporting both portrait and landscape orientations for a comfortable user experience. ### What is the age rating for Meridian? Meridian has an age rating of 4+, making it suitable for a wide range of users interested in tracking their health and mood. ### How does Meridian compare to other mood trackers? Unlike trackers that only collect data, Meridian actively finds patterns and correlations, turning raw data into actionable insights. It prioritizes privacy and a calm user experience over gamification or social features. ### Is Meridian free to use? Yes, Meridian is available for free. It does not contain advertisements and focuses on providing valuable insights into your health and mood. ## Version history (last 5 releases) ### 1.3.0 — 2026-08-10 Clearer pattern context and easier daily logging: • Associations now align calendar days and use an exploratory statistical screen based on permutations. • Next-day estimates appear only with enough data and after holdout checks against a simple baseline. • Sleep is saved correctly when you keep the default value. • Pro exports are now real JSON files. • History ranges, reminders and purchase restoration are more reliable. ### 1.2.9 — 2026-07-31 Clearer symptom and mood entry, with faster pattern charts. ### 1.2.8 — 2026-07-22 Clearer Pro description — plus small fixes throughout. ### 1.2.7 — 2026-07-21 • Fixed: the daily log sheet no longer appears empty on new installs • Gentler, optional daily check-in reminder • Small fixes and polish ### 1.2.6 — 2026-07-18 • Fixed: the daily log sheet no longer appears empty on new installs • Gentler, optional daily check-in reminder • Small fixes and polish ## More apps by Hyun Sik Kim - [Vocab Bubbles](https://appshunter.io/ios/app/vocab-bubbles/id6758256351) - [Math Dash Everyone](https://appshunter.io/ios/app/math-dash-everyone/id6758323620) - [Car Maintenance: Garage Story](https://appshunter.io/ios/app/car-maintenance-garage-story/id6759947168) - [Mental Math Puzzles & Practice](https://appshunter.io/ios/app/mental-math-puzzles-and-practice/id6773204509) - [Home Repair & Warranty Log](https://appshunter.io/ios/app/home-repair-and-warranty-log/id6780077621) All apps by Hyun Sik Kim: https://appshunter.io/developer/1871784166 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-11.*