YPT vs Sum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
YPT
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.
- Study time tracking
- Daily planner and to-do lists
- Remote study groups
- Real-time user rankings
- Visual study statistics
- Progress sharing with friends
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Study along with 5 million people all over the world. Studying is a marathon. Study together on YPT Record your study time and share it with friends. Get motivated with your friends and study together remotely. 1. Time tracking and todo Tracking study time for each subject. 2. 10 minutes planner Review your daily study logs. Check To-do for the day. 3. Study groups Create groups to check out friends' status and study activities. 4. Realtime ranking Get to know your rank in the same study category. 5. Study stats Color gets deeper as you study more. Visualize your day/week/month study records. [End User License Agreement | Privacy Policy | Terms of Service Use | Subscription Terms of Service] ▷ End User License Agreement (EULA) : https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ ▷ Terms of Service Use : https://yeolpumta.notion.site/eb3f7a2886ac42d1b9e629a9075c339d ▷ Privacy Policy : https://yeolpumta.notion.site/4bdcc3a5d7c34803ad49d05f7422aea0 ▷ Subscription Terms and Conditions : https://yeolpumta.notion.site/87efb0d77a5b4a7bb6753a1653c3cb47 [ Customer Support ] ▷ E-Mail : pallo.ypt@gmail.com Addr: 16, Teheran-ro 53-gil, Gangnam-gu, Seoul, Republic of Korea Tel: 070-4571-4756
Sum
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.
- Study time tracking
- Subject and material logging
- Weekly progress graphs
- Calendar visualization
- Study streaks
- Pomodoro timer
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This is a simple study timer app that allows you to record and manage your study time by subject. Simply measure your time with the timer and save it. You can also log sessions manually or add entries for past dates. You can record everything together, including subjects, study materials, pages, and notes. You can view the big picture of your studies by checking your subject balance with weekly graphs and reviewing your progress streaks on the calendar. No ads, no social media features, and no account registration required. All data is saved on your device, so there are no privacy concerns. Perfect for anyone who wants to focus on learning, from exam preparation to certifications and language studies. [Main Features] - 3 timer modes (Stopwatch, Countdown, Pomodoro) - Management of subjects, materials, pages, and notes - Weekly graphs to check subject balance (bar chart & donut chart) - Calendar to visualize study days with color-coding - Display of consecutive study days (streaks) - Daily study reminder - Backup and data export functions [Stackd Pro (One-time purchase)] - Monthly graphs and cumulative line graphs - Setting weekly goals and checking achievement rates - 9 color themes - Home screen and lock screen widgets - Real-time timer display on the Lock Screen
Screenshots
Verdict
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.
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. 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.
| Parameter | YPT | Sum |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (1.8K ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 55.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 1.8K — better | 2 |
| Update frequency | Every 2 days — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone |
| Requires iOS | 15.0 — better | 18 |
| Further details — not scored | ||
| Size | 269 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | UnCheon Baek | Nene Nakagawa |
Customer experience
YPT
Sum
Bugs and requests
YPT
Reported bugs
4 issues- 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
4 requests- 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
Not enough reviews yet to summarise bugs or requests.
In-app purchases
YPT
- Monthly subscription$2.991 Month
- Monthly Premium$4.991 Month
- Yearly Premium$29.991 Year
- 100 flames$0.99
- Unlock Apps$0.99
- 600 flames$3.99
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- 6 months$11.99
- 12months$19.99
Sum
- Stackd Pro$1.99
