Comparison

R vs Aikikorner

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

Head to head
About

R

Features
Read full description

R-Timer is a timer that plays the sound of a gong - designed for sports matches such as boxing. The sound of a gong is played at the beginning and end of a round. You can also make some wooden clappers make a sound just before the end of a round. New functionality has been added for providing notifications while the app or OS is in suspend mode. Enable the notification functionality to receive notifications through messages and gong sounds. The notification functionality settings can be found under the settings screen. Notification Functionality in Suspend Mode - The volume of the notifications is determined by the OS settings. - Putting the app in suspend mode and active mode repeatedly will make the end time slip. - Notification sounds may not be played successfully on low specification devices. - The number of configurable notifications is determined by the OS. Setting too many notifications will cause the notification functionality to stop working. - The app may behave differently between running in normal mode and in notification mode. - To stop notifications, please stop the app or open the app's settings screen. Functionality - Notifies you of the beginning and end of a round by playing the sound of a gong. - Find out the end time by looking at the settings screen - Added at the start of the round the voice, such as "Round One" (up to 1-30 round) - Add a voice such as "box" or "Fight" at the start of the round - Can give a signal just before the end of a round by playing some wooden clappers. - Can configure a different sound for the end of the last round. - As you might not be able to tap on the screen, you can start, pause, and restart the app by shaking the device. - Pause and restart the timer while it is running. - Configure it only once and next time you will be able to use it straight away. - Configurable volume Note: the volume in the app is determined by the volume set on your device, so if the volume is too low, please increase the volume on your device. Specifications Setting the Number of Rounds : 1 - 200 Time per round : 0[sec] - 100[min]59[sec] Preparation time : 0[sec] - 1000[sec] Signal before end of round : None - Time per round Resting time : 0[sec] - 1000[sec] Time display : 24[hour] or AM/PM Signal Start of round : Gong, Chinese gong, Bell End of round : Gong, Chinese gong, Bell End of last round : Gong, Chinese gong, Bell Signal before end of round : Wooden clappers, Chinese gong, Bell Note: the volume in the app is determined by the volume set on your device, so if the volume is too low, please increase the volume on your device.

About

Aikikorner

This app helps Aikido practitioners review and clarify techniques with visual explanations and Japanese names. It's designed for use between classes to reinforce learning and prepare for exams. Access a video library and practice offline.

Highlights
  • Video library of 145+ HD techniques
  • Technique descriptions with Japanese names
  • Exam mode for grading preparation
  • Offline video access
  • Interactive quiz for technique names
  • Available in 18 languages
Features
Read full description

Your dojo in your pocket Do you mix up Ikkyo and Nikkyo? Can't remember how Suwari Waza goes? This app helps you review and clarify Aikido techniques, with visual explanations and clear Japanese names. NOT an Aikido course. This is what you use BETWEEN classes. If you practice Aikido, you already know there is no substitute for the tatami. But sometimes, outside the dojo, you need to remember a movement, understand a position, or prepare before your next training. Here you will find a small guide made with care for my fellow practitioners. Welcome: I hope you find it useful. VIDEO LIBRARY Over 145 HD techniques recorded with our master and his best students. Technique review Descriptions and Japanese names (Tachi-Waza, Suwari-Waza, Ushiro-Waza, Hanmi-Handachi-Waza) to clarify each movement. Exam Mode Filter the exact techniques for your next grading by level (6 Kyu to Shodan) and position. Offline access Download the videos you want and train without internet. Interactive quiz Test yourself on the correct Japanese technique names. Available in 18 languages.

Screenshots

R4 screens
Aikikorner4 screens

Verdict

The call

The clearest difference is price: Aikikorner at Free against R's $0.99. Aikikorner also leads on update cadence (every 9 days vs every 3 months). R's advantage is in-app purchases (none vs 1) and ads (none vs shown). 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

Aikikorner is free to download; R costs $0.99 up front. Aikikorner sells 1 one-off in-app purchase. R asks for nothing beyond the download.

UpkeepUpdate frequency

R ships an update every 3 months, Aikikorner every 9 days. Both last shipped on September 21, 2026.

Scorecard5 real differences · 5 level
R versus Aikikorner: the parameters behind the verdict, then further details
ParameterRAikikorner
Price$0.99Free — better
Rating—4.0 (1 ratings) — better
Positive reviews—87.5% of reviews
Number of ratings—1 — better
Update frequencyEvery 3 monthsEvery 9 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size17 MB89 MB
Age rating4++17
DeveloperYoshiaki OnishiDavid Margalef Mari

In-app purchases

None

R

No in-app purchases

1 purchases

Aikikorner

One-time1
  • Premium Content$3.99

Questions

Is R free?
R costs $0.99, with no in-app purchases.
Is Aikikorner free?
Aikikorner is free to download, with in-app purchases available.
Do R or Aikikorner have ads?
Aikikorner shows ads; R does not.
Which is updated more often, R or Aikikorner?
R ships an update every 3 months, and Aikikorner every 9 days. Most recently, R was updated on September 21, 2026 and Aikikorner on September 21, 2026.

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