X vs Simple Study Stamp
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
X
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X-SERVE(X-ray examination Scattered Radiation Visualize application)は、モンテカルロ計算に基づいた医療X線診療時の散乱線の挙動を拡張現実(AR)で可視化できるアプリです。 X-SERVE_VDは、臥位の検査(X線撮影や透視等)における散乱線分布のVolume Dataを使用し、X線診療室内の任意の散乱線分布の断面像を可視化するアプリです。 ・シミュレーションの照射条件は以下になります。 (管電圧87 kV、焦点検出間距離120 cm、腹部仰臥位正面、) 表示される線量の単位は[μSv/mGy]で、入射表面線量1mGy当たりの周辺線量当量を示しています。 ・画面右上Visiblityで、患者、装置の表示のon/offができます。 ・画面右下Adjustmentで、表示物の大きさの調整(Scale)、位置の平行移動(Position)、左右回転(Rot-Right/Left)ができます。 ・画面左上のボタンを押し、3軸の表示断面の調整、下方でカラースケールの調整ができます。 ・画面下では、カメラ位置での線量を数値と色で示しています。 本アプリは、スチームパンクデジタル株式会社にご支援いただき開発いたしました。
Simple Study Stamp
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Your study time is more than just a number. Keep your goals—and your current study session—visible right from your Home Screen and Lock Screen. Simple Study Stamp is a simple yet practical study time tracker with stopwatch, timer, and manual entry. With widgets, you can quickly check: • Time remaining until your goal date • Total study time • Target study time • Progress percentage And while a timer or stopwatch is running, you can check your current study status directly from the Lock Screen. Even after leaving the app, you can instantly see whether a study session is still running and how long you’ve been studying. Stay aware of your study session. Stay focused on your goal. Simple Study Stamp is designed to make consistent studying easier. See your progress at a glance Your study time is automatically organized by day, week, month, and year. Use easy-to-read bar charts and pie charts to see what you’ve studied and how much time you’ve spent on each subject. The calendar view also makes it easy to look back and see: “How much did I study that day?” “How much have I accomplished this month?” Your effort doesn’t disappear—it becomes a visible record of your progress. Track your way Choose the recording method that fits your study style: • Stopwatch • Timer • Manual entry Whether you’re studying at your desk, learning a language on your commute, reading, preparing for an exam, or working on professional development, you can record your study time in the way that works best for you. Keep your goals visible Set a target study time and goal date for each subject. Instead of simply recording study hours, Simple Study Stamp helps you stay aware of how far you’ve come and how far you still have to go. Home Screen and Lock Screen support make your goals easier to remember throughout the day. Great for • Exam preparation • Certifications • Language learning • Reading • Programming • Professional development • Self-study and lifelong learning No complicated setup. No unnecessary features getting in your way. No in-app purchases. Just open the app, start studying, and keep building your progress one session at a time. One minute today can make a big difference tomorrow. Make every minute count.
Screenshots
Verdict
The clearest difference is ads: X at none against Simple Study Stamp's shown. X also leads on iOS requirement (12.0 vs 17.0). Simple Study Stamp's advantage is update cadence (every 10 days vs every 6 months). On price, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
X ships an update every 6 months, Simple Study Stamp every 10 days. The most recent releases landed on October 5, 2026 and October 16, 2026 respectively.
| Parameter | X | Simple Study Stamp |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 months | Every 10 days — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 12.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 620 MB | 10 MB |
| Age rating | 12+ | 4+ |
| Developer | Kyushu University | Futoshi Akahoshi |
In-app purchases
X
No in-app purchases
Simple Study Stamp
No in-app purchases









