Study Planner 21 vs Retime
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Study Planner 21
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Study planner app for students who don't want to forget to study or lack of scheduling, and parents who are worried about whether the study schedule is set correctly. It is useful for creating study plans for tests, grasping things to do, scheduling, and grasping progress of studying! ! Please try this study planner app. in order not to say "I didn't have enough time to study." or “Oh, I forgot studying about this..” on the day of the tests or exams, -------------------- How to do use▼▼ -------------------- It's easy. 1. If you follow the directions in the app, you can create a to-do list for each subject. 2. Next, let's link the things to do to the schedule. After dragging the pages of the to-do plan, please select the date and time of calendar. 3. After all study to-do are linked to the calendar, let’s study according to the schedule. 4. After studying, tap the schedule and press the Done button. The results row is filled. You'll know if you're currently behind in progress or not later. 5. If all the results rows are filled in, you have completed your study.
Retime
This app helps serious learners manage their study time and track progress. It combines a timer, task management, and analytics to visualize daily efforts and ensure goals are met. Features include goal setting, exam countdowns, and app blocking to enhance focus.
- Unified task management and timer
- Study goal progress tracking
- Exam countdown and score tracking
- Distracting app blocking
- Pomodoro and count-up timer modes
- Study time visualization
- Customizable subjects and themes
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You're studying hard, but can't see any progress. You make a plan, but somehow it always falls apart. That feeling of "working hard but getting nowhere" — Retime changes that. Retime is a study management app for serious learners, bringing together a timer, task management, and learning analytics in one place. "Plan → Focus → Record → Analyze" Complete this entire cycle in a single app. Your daily efforts become visible through graphs and numbers. Students preparing for exams, professionals studying for certifications, language learners, building a reading habit—— Retime is here for anyone who is serious about reaching their goals. Feature ① Task Management and Timer, Unified ・Manage daily tasks with a weekly calendar. Swipe smoothly between weeks ・Link tasks to your timer to accurately record what you studied and for how long ・Set up recurring tasks to automatically create your daily study routine ・Drag and drop to reschedule tasks with ease ・One glance at your to-do list tells you exactly what to study today Feature ② Track Whether You're On Pace with Study Goals ・Set concrete goals like "finish 300 pages of this textbook by [date]" ・Automatically compare your recommended daily pace against your actual progress ・A predicted completion date is always shown, so you know at a glance whether you'll make it in time ・Manage multiple goals simultaneously — exam prep, certifications, reading, and more Feature ③ Exam Countdown & Mock Exam Score Tracking ・Register your exam dates and see remaining days updated in real time ・Log your mock exam and practice test scores by subject ・Visualize your score trends with charts to see how much you've improved Feature ④ Block Distracting Apps During Study Sessions ・Block apps like social media, YouTube, and games while you study ・Effective for breaking phone addiction ・Blocking is active only while the timer is running, so the quality of your study time goes up Feature ⑤ Two Timer Modes: Pomodoro & Count-Up ・Use the Pomodoro timer to alternate between focused work and breaks, maximizing productivity ・Use the count-up timer to freely measure and log your study time ・Supports Dynamic Island and Lock Screen Live Activity — always keep an eye on your timer ・Check today's study time at a glance with the home screen widget ・Stay focused with background sounds like alpha waves, brown noise, rain, and ocean waves Feature ⑥ Visualize Study Time to Stay Motivated ・View weekly and monthly study time trends in graph form ・See a subject-by-subject breakdown to understand where your time is going ・Browse your full session history in a timeline view ・Watching your efforts pile up keeps the motivation going Feature ⑦ Customize to Make It Yours ・Set your own subject names and colors ・Change the app's theme color to match your style Suitable for every learning scenario — students, professionals studying for certifications, language learners, and anyone building a reading habit. Start recording a little every day, and keep moving toward your goal.
Screenshots
Verdict
The clearest difference is in-app purchases: Study Planner 21 at none against Retime's 3. Study Planner 21 also leads on iOS requirement (13.6 vs 17.0). Retime's advantage is update cadence (every 5 days vs every 3 weeks). On price, ads 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. Retime sells 3 in-app purchases, starting at $1.99 per month. Study Planner 21 asks for nothing beyond the download.
Study Planner 21 ships an update every 3 weeks, Retime every 5 days. The most recent releases landed on September 13, 2026 and September 23, 2026 respectively.
| Parameter | Study Planner 21 | Retime |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 72.2% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 25 MB | 30 MB |
| Age rating | 4+ | 4+ |
| Developer | Foodmenu.world Inc. | Ryo Iida |
In-app purchases
Study Planner 21
No in-app purchases
Retime
- リタイム PRO 1ヶ月$1.991 Month
- リタイム PRO 1年間 キャンペーン1 Year trial$19.991 Year
- リタイム PRO 1年間$19.991 Year









