# YPT vs Sum

The clearest difference is review sentiment: Sum at 100% against YPT's 56%. Sum also leads on rating (5.0 vs 4.7). YPT's advantage is update cadence (every 2 days vs every 3 weeks) and ratings volume (1.8K vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. YPT sells 8 in-app purchases, starting at $2.99 per month and Sum sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Sum holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: YPT has 1.8K ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 56% of YPT's written reviews are positive against 100% of Sum's.

YPT ships an update every 2 days, Sum every 3 weeks. Both last shipped on November 9, 2026.

## The numbers

| Metric | YPT | Sum |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (1.8K ratings)](https://appshunter.io/ios/app/ypt-study-group/id1441909643/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821/reviews)** |
| Number of ratings | **1.8K** | 2 |
| Positive reviews | 55.9% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 269 MB | 3 MB |
| Requires iOS | **15.0** | 18 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [UnCheon Baek](https://appshunter.io/developer/1143037815) | [Nene Nakagawa](https://appshunter.io/developer/1821103094) |

## What reviewers say

### YPT

[App page](https://appshunter.io/ios/app/ypt-study-group/id1441909643)

This app helps you track your study time and set daily goals. Connect with friends and other users globally to form study groups, share progress, and compete in real-time rankings. Visualize your study habits with detailed statistics.

**Highlights:** Study time tracking, Daily planner and to-do lists, Remote study groups, Real-time user rankings, Visual study statistics, Progress sharing with friends

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $2.99 | per month |
| Monthly Premium | $4.99 | per month |
| Yearly Premium | $29.99 | per year |
| 100 flames | $0.99 | one-time |
| Unlock Apps | $0.99 | one-time |
| 600 flames | $3.99 | one-time |
| 6 months | $11.99 | one-time |
| 12months | $19.99 | one-time |

**What reviewers like**

- 🚀 Motivating and competitive
- 👍 Comprehensive features (timer, planner, study groups)
- 🎨 Customizable themes and aesthetics
- 🔊 Helpful background noise options

**What reviewers complain about**

- 🐛 Bugs and glitches (freezing, crashing, time recording issues)
- ⏱️ Time zone issues for users outside of Korea
- 🔒 Restricted app access during study sessions

**Reported bugs**

- Timer not stopping when exiting the app
- Inconsistent time recording across devices
- Sudden language changes without user input
- Connectivity issues and server problems

**Requested features**

- Add ability to edit/remove specific study time entries
- Implement a desktop/web version of the app
- Allow more customization options for the calendar and planner
- Improve the allowed apps feature to work more reliably


### Sum

[App page](https://appshunter.io/ios/app/sum-study-timer-and-tracker/id6761293821)

Track and manage your study time by subject with a simple timer. Log sessions, add notes, and visualize your progress with weekly graphs and a calendar. Focus on learning without distractions.

**Highlights:** Study time tracking, Subject and material logging, Weekly progress graphs, Calendar visualization, Study streaks, Pomodoro timer

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackd Pro | $1.99 | one-time |


## Frequently asked questions

### Is YPT free?

YPT is free to download, with in-app purchases available.

### Is Sum free?

Sum is free to download, with in-app purchases available.

### Which has better reviews, YPT or Sum?

Sum is rated higher. YPT averages 4.7 out of 5 from 1.8K ratings, while Sum averages 5.0 from 2 ratings.

### Do YPT or Sum have ads?

Neither YPT nor Sum shows ads.

### Which is updated more often, YPT or Sum?

YPT ships an update every 2 days, and Sum every 3 weeks. Most recently, YPT was updated on November 9, 2026 and Sum on November 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*