OneTime vs Kotsumi
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
OneTime
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OneTime is a time-tracking stopwatch for recording time and organizing your day. Start with one tap, and your records flow into a timeline, calendar, and stats. You can track study, work, exercise, reading, and daily activities. See how much you did each day and review weekly and monthly patterns. What you can do with OneTime โข Timeline See your activities in chronological order throughout the day. โข Calendar Review your records by date and check any day you want. โข Stats See how you spend your time with weekly and monthly patterns. โข Time tracking Use a stopwatch that tracks one activity at a time. โข Manual entries and edits Add missed time later, edit existing records, and leave notes. โข Automatic tracking by app Track time automatically based on selected apps. โข Routines and checklists Organize recurring items and manage date-based checklists. You can add items, reorder them, and carry unfinished items over to the next day. Missed a record? No problem. You can add or edit it later. OneTime is built not just for measuring time, but for reviewing and organizing your records. If you want time tracking, timeline, calendar, and stats in one app, OneTime fits. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Kotsumi
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Turn your study plans into focused sessions. Kotsumi brings a focus timer, daily planner, personal notebooks, and shared study rooms into one calm space. Whether you're preparing for an exam, working through homework, or building a study routine, take it one session at a time. FIND YOUR FOCUS Choose a timed focus session with breaks, or study at your own pace with an open-ended session. Start with a task in mind and see the time you put in. MAKE YOUR PLAN YOUR OWN Organize daily tasks and keep notes in your notebooks. Add stickers and study icons to give your planner a personal touch. STUDY TOGETHER Join study rooms, chat with members, and take part in shared focus sessions. Optional room challenges give you another way to work toward a goal together. SEE YOUR PROGRESS Look back on your study history, explore your statistics, and follow your streaks. Notice the sessions that add up over time. PERSONALIZE AS YOU GO Earn Kotsu Coins through studying and use them to personalize your experience. Coins are earned in the app and cannot be purchased for real money. CHOOSE WHAT YOU SHARE Manage your profile visibility and decide what to share through Study Updates. Report content, block accounts, and delete your account from Settings. A little planning. A focused session. Time well spent. Kotsumi is currently available in English.
Screenshots
Verdict
The clearest difference is in-app purchases: Kotsumi at none against OneTime's 4. Kotsumi also leads on ads (none vs shown). OneTime's advantage is iOS requirement (18.0 vs 26.0). On price and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. OneTime sells 4 in-app purchases, starting at $0.99 per month. Kotsumi asks for nothing beyond the download.
| Parameter | OneTime | Kotsumi |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | โ |
| Ads | Yes | No โ better |
| In-app purchases | Yes | No โ better |
| Devices | iPhone, iPad โ better | iPhone |
| Requires iOS | 18.0 โ better | 26.0 |
| Further details โ not scored | ||
| Size | 65 MB | 98 MB |
| Age rating | 4+ | 12+ |
| Developer | UNCHAN BAEK | Sticker Mori |
In-app purchases
OneTime
- Launch Monthly$0.991 Month
- Monthly7 Days trial$1.991 Month
- Token Bundle$0.99
- Lifetime$11.99
Kotsumi
No in-app purchases





