Heart Diary vs Quantify
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Heart Diary
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Blink, and a day's gone.What did you feel? Capture your emotions in words Do you know When you are happy? When you feel excited? When you are sad? When you are angry? When you feel anxious? Most people don't really understand their own emotions. Because they don't know, They can't fully enjoy moments of happiness, And they are deeply hurt in difficult times. When exciting moments come to you, recognize them and fully experience them. Such moments don't come often. These memories enrich your life. Increase happy events, Decrease sad ones, And create a happier life. [Features of Heart Diary] ■ Record with Emotion Stickers Express your emotions with cute emotion emoticons. ■ Emotion Calendar View your emotional records at a glance with a beautiful emotion calendar. ■ Secret Diary Keep your diary safe with a screen lock function. ■ Day-of-the-week Setting Choose between starting the week on Monday or Sunday. ■ Add Photos You can record moments by adding photos. ■ Data Backup and Restore Store data in personal cloud (Google Drive, iCloud). ■ Analysis and Statistics Offers analysis and statistical features. ■ Reminder Function Manage writing times with notifications. [Benefits of Heart Diary] ● Emotion Tracking: Record and analyze your emotional changes to understand what emotions you feel in different situations. ● Diary Writing: Expressing emotions is a healing process. Heart Diary provides a space for you to freely express your thoughts and feelings. ● Personalized Insights: Based on your diary records, it offers personalized insights and advice to help in self-improvement. ● Recognition of Happy Moments: Heart Diary helps you recognize more happy moments and fully enjoy them.
Quantify
This app allows users to create custom data trackers for any aspect of their lives. Visualize your progress with real-time charts and analyze relationships between different variables. Securely sync your data across devices with cloud backup.
- Custom trackers (numeric, text, boolean, timestamp)
- Real-time line charts
- Correlation analysis with p-values
- Cloud sync across devices
- Secure sign-in with Apple/Google
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Quantify is a powerful data tracking tool designed for users who want complete control over what they measure and how they interpret it. Key Features: Custom Trackers: Create unlimited trackers with numeric, text, boolean, or timestamp inputs. Realtime Charts: Visualize your data instantly with line charts updated live. Correlation Analysis: Identify relationships between variables with built-in correlation scoring and p-value calculations. Cloud Sync: Data is securely stored and synced across devices via Firebase Firestore. Secure Sign-In: Log in using Apple or Google with Firebase Authentication.
Screenshots
Verdict
The clearest difference is in-app purchases: Quantify at none against Heart Diary's 6. Quantify also leads on ads (none vs shown) and update cadence (daily vs fortnightly). Heart Diary's advantage is iOS requirement (15.0 vs 17.6). On price 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. Heart Diary sells 6 one-off in-app purchases. Quantify asks for nothing beyond the download.
Heart Diary ships an update fortnightly, Quantify daily. The most recent releases landed on October 3, 2026 and October 7, 2026 respectively.
| Parameter | Heart Diary | Quantify |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Fortnightly | Daily — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 80 MB | 20 MB |
| Age rating | 4+ | 4+ |
| Developer | Minwook Kim | Nicole Blair Stoddart |
In-app purchases
Heart Diary
- Premium Pass$0.99
- Premium Pass$1.99
- Premium pass$3.99
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- Premium pass$7.99
- Premium pass$14.99
- Premium pass$29.99
Quantify
No in-app purchases









