Comparison

屈折度数 ORT.com vs Presentation Clock TimeKeeper

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

屈折度数 ORT.com

This app visualizes refractive errors, from power cross to image formation diagrams. It instantly calculates and displays the main and weak axes of astigmatism, simulates image formation on the retina, and helps distinguish between different types of astigmatism. Ideal for students and professionals in vision training.

Highlights
  • Instant calculation of main and weak astigmatism axes
  • Visual power cross display
  • Image formation diagram simulation
  • Distinguishes astigmatism types
  • Simple and speedy operation
  • Ideal for vision training students and professionals
Features
Read full description

「パワークロスから結像図まで、屈折異常を視覚化する。」 複雑な乱視計算、もう迷わない。 数値を入力するだけで、強主経線・弱主経線の特定から結像状態のシミュレーションまでを一瞬で完了します。 ■ アプリの特徴 1. 瞬時に算出、強主経線と弱主経線 球面度数(S)、乱視度数(C)、乱視軸(Ax)を入力するだけで、瞬時に強主経線・弱主経線の経線角度と度数を計算します。国家試験の計算問題の答え合わせや、臨床での度数確認に最適です。 2. 直感的な「パワークロス」表示 計算結果をパワークロスで図示します。度数の分布を視覚的に捉えることができるため、乱視の構造がより深く理解できます。 3. 結像状態を可視化する「結像図」 入力された度数に基づき、網膜に対して焦点がどこに結ばれているか(前焦線・後焦線)を結像図として描写します。 近視性乱視、遠視性乱視、混合乱視の判別 最小錯乱円の位置関係 等価球面度数のイメージ把握 これらがひと目で分かるため、学生の学習効率を劇的に高めます。 4. シンプルかつスピーディな操作性 臨床現場や勉強の合間にサッと使えるよう、入力の手間を最小限に抑えたUI設計を採用。決定ボタン一つで、必要なすべての情報にアクセス可能です。 ■ こんな方におすすめ 視能訓練士を目指す学生: 国家試験の「屈折」科目の攻略に。 教職員・指導者: 学生へ屈折の概念を視覚的に説明する際のツールとして。 現役の視能訓練士: 複雑な処方や検査結果の再確認、新人教育の補助に。

About

Presentation Clock TimeKeeper

This app helps you manage your speaking time during presentations and speeches. It offers customizable bell sounds and visual indicators to keep you on track and deliver impactful performances.

Highlights
  • Flexible timer management (start, pause, reset)
  • Customizable bell sounds at three intervals
  • Optional notifications
  • Visual indicators for time awareness
  • User-friendly interface
  • Versatile for speeches, debates, and meetings
Features
Read full description

Are you tired of going over your allotted time during presentations or speeches? Look no further than TimeKeeper, the powerful and user-friendly speech timer app designed to keep you on track and elevate your public speaking skills. Key Features: - Flexible Timer Management: With TimeKeeper, you can easily start, pause, and reset timers for your speech or presentation. Maintain full control over your time, ensuring you stay within your allocated slots. - Customizable Bell Sounds: Stay in sync with your time slots by setting up to three distinct time intervals. TimeKeeper will emit a bell sound at each specified interval, providing you with audible cues to transition smoothly through your speech. The app also includes notifications(optional). - Enhance Time Awareness: Visual indicators within TimeKeeper's intuitive interface help you visualize your progress as you speak. Keep a close eye on the timer countdown, enabling you to pace yourself effectively. - Versatile Application: TimeKeeper is perfect for various scenarios, including presentations, speeches, debates, workshops, and meetings. Whether you're a student, professional, or public speaker, this app is an invaluable tool to keep you organized and deliver impactful performances. - User-Friendly Design: TimeKeeper's sleek and intuitive interface ensures a seamless experience. Effortlessly navigate through timer controls and settings, allowing you to focus on your speech without distractions. Take control of your speaking engagements with TimeKeeper, the ultimate speech timer app for iOS. Download now and experience the confidence of delivering your best presentations every time. Privacy Policy: https://sites.google.com/view/timekeeper-privacy Terms of Use: https://sites.google.com/view/timekeeper-terms

Screenshots

屈折度数 ORT.com4 screens
Presentation Clock TimeKeeper4 screens

Verdict

The call

The clearest difference is review sentiment: 屈折度数 ORT.com at 100% against Presentation Clock TimeKeeper's 25%. 屈折度数 ORT.com also leads on in-app purchases (none vs 3) and ads (none vs shown). Presentation Clock TimeKeeper's advantage is price (Free vs $0.99) and update cadence (every 3 weeks vs every 39 months). On 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

CostPrice · In-app purchases · Ads · Monetization

Presentation Clock TimeKeeper is free to download; 屈折度数 ORT.com costs $0.99 up front. Presentation Clock TimeKeeper sells 3 in-app purchases, starting at $1.99 per month. 屈折度数 ORT.com asks for nothing beyond the download.

UpkeepUpdate frequency

屈折度数 ORT.com ships an update every 39 months, Presentation Clock TimeKeeper every 3 weeks. The most recent releases landed on October 1, 2026 and September 24, 2026 respectively.

Scorecard7 real differences · 3 level
屈折度数 ORT.com versus Presentation Clock TimeKeeper: the parameters behind the verdict, then further details
Parameter屈折度数 ORT.comPresentation Clock TimeKeeper
Price$0.99Free — better
Rating—4.9 (14 ratings) — better
Positive reviews100.0% of reviews — better25.0% of reviews
Number of ratings—14 — better
Update frequencyEvery 39 monthsEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size0 MB21 MB
Age rating4+4+
Developerkohei yamaneJordan Holland

Customer experience

屈折度数 ORT.com

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Presentation Clock TimeKeeper

All ratings14 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

In-app purchases

None

屈折度数 ORT.com

No in-app purchases

3 purchases

Presentation Clock TimeKeeper

Subscriptions2
  • Premium$1.991 Month
  • Premium7 Days trial$12.991 Year
One-time1
  • Premium$19.99

Questions

Is 屈折度数 ORT.com free?
屈折度数 ORT.com costs $0.99, with no in-app purchases.
Is Presentation Clock TimeKeeper free?
Presentation Clock TimeKeeper is free to download, with in-app purchases available.
Do 屈折度数 ORT.com or Presentation Clock TimeKeeper have ads?
Presentation Clock TimeKeeper shows ads; 屈折度数 ORT.com does not.
Which is updated more often, 屈折度数 ORT.com or Presentation Clock TimeKeeper?
屈折度数 ORT.com ships an update every 39 months, and Presentation Clock TimeKeeper every 3 weeks. Most recently, 屈折度数 ORT.com was updated on October 1, 2026 and Presentation Clock TimeKeeper on September 24, 2026.

Other comparisons