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RacquetTune - String Tension 螢幕截圖

iPad

iPhone

About RacquetTune - String Tension

Listen to your racquet and perfect your game!

RacquetTune ensures that your racquet is ideally suited to your style of play. Simple and straightforward to use, the app uses the sound generated by tapping the strings to calculate the tension with high accuracy. In addition, the interactive swingweight calculator aids in customizing your racquet to fit your own stroke pattern, while the stiffness calculator allows you to simulate different racquet configurations.

RacquetTune not only makes it easier to decide when it is time to restring, it is also an invaluable tool when testing different racquets and strings and in identifying which of your racquets is best suited for different types of games. RacquetTune also allows you to check whether your stringer is consistent in his work.
RacquetTune includes the following user-friendly tools:

Tension measurement
- Quickly determines the tension and stringbed stiffness.
- Able to detect changes in tension as small as 0.1 kg/0.2 lb.
- An accuracy indicator ensures results are consistent.
- Graphical presentation of sound waves helps you find the ideal way of tapping the strings.
- Settings can be customized to serve tennis, squash, racquetball and badminton racquets, respectively.
- View the tension history for each racquet as a list or a graph.
- Email a spreadsheet with test data.

Swingweight calculator
- Add as many weights as you wish to the frame.
- Move and change weights to visualize how swingweight, balance and sweet spot location are affected.
- Enter target values for the racquet and let RacquetTune distribute the weights automatically.

Stiffness calculator
- Simulate various racquet and string configurations
- Vary tension, string type and racquet head size.
- Shows load-displacement curves, stiffness and elastic energies
- Handles the large deformations encountered in actual play

View a demo video at racquettune.com

RacquetTune has been featured in tennis magazines in USA, Italy, France, Germany, Sweden and Norway.

"The app is very, very impressive. I get more tension diagnostic questions than just about anybody in the universe, so this is a very good thing to be able to recommend."
Jonathan Wolfe
US Racquet Stringers Association

Note, that the actual string tension in the racquet and the setting seen on a stringing machine are two different things and therefore incomparable - more information can be found at racquettune.com.

最新版本7.6更新日誌

Last updated on 2020年02月28日

歷史版本

- All weights in swingweight can be removed with a long press on the +Weight button.
- A problem with uploading the database has been fixed.

Version History

7.6

2020年02月28日

- All weights in swingweight can be removed with a long press on the +Weight button.
- A problem with uploading the database has been fixed.

7.5

2019年12月19日

- Easier to pick strings in the online DB.
- A sound detection problem on some device has been improved/fixed .

7.4

2019年09月25日

iOS 13 compatibility improvements (dark mode will come later).

7.3

2019年04月09日

Picking a racquet will automatically pick the string used last time.

7.2

2019年01月05日

- A set up in History for configuring the display.
- The tension drop in % can be displayed in the curve view.
- A potential crash in the curve view has been fixed.

7.1

2019年01月02日

- The curve view in History has been restored and improved.
- A 'broken string' setting in save tension.
- 'Played hours' can be set as a decimal.
- Stiffness is shown in the History detail view.
- Fixed a problem with duplicated comments in History.

7.0

2018年12月19日

This is a major update of RacquetTune that contains:
- Better adaption to different screen sizes
- New tension database
- New swingweight database
- Better handling of hybrid strings
- Interface improvements
- Much improved data export
- A lot of smaller fixes and improvements

6.3

2017年10月05日

- iOS 11 compatibility
- Fixed a database conflict

6.2.1

2017年07月13日

Fixed a problem in the tension display that could cause a crash on some devices.

6.2

2017年06月28日

- Twistweight in the swingweight calculator.
- The swingweight calculator can display changes as well as absolute values.

6.1

2017年03月24日

- Fixed the formatting of the exported testdata in countries with decimal point.
- Fixed a problem with a frozen database that could occur while testing.

6.0

2016年10月13日

- Racquet, string and test data can be saved to iCloud for easier backup and transfer to another device.
- More string patterns in Stiffness.
- Bug fixes in Swingweight.
- Fixed the translate button in the Guide.
- iOS 10 updates.

5.8

2016年02月12日

- Current racquet and string are displayed on the test page (tap on the sound curve).
- Consistent use of decimal comma in relevant countries.
- Several minor fixes.

5.7

2015年09月01日

- Improvements in the sound analysis resulting in even more consistent results and fewer strikes.
- Access to on line racquet data in SwingWeight.
- iOS 9 compatibility.
- Some minor fixes.

5.6

2015年06月01日

The Stiffness Calulator is now free to celebrate the 5:th annivesary of RacquetTune.
Updates in 5.6:
- Double tap on the sound graph to see the harmonics (can be useful for difficult racquets).
- When sorting racquets 'Recent' now means 'recently used', not recently added as before.
- Some minor fixes.

5.5

2014年10月28日

- The tension drop is displayed on the test page
- A number of minor fixes

5.4.1

2014年10月14日

Fixed a crash when deleting a row in History.

5.4

2014年09月18日

- Interface improvements (better consistency)
- iOS 8 adaptions
- Stiffness in History graphs.
- Frequency in the tension range setting.
- Unit setting in the save dialog remembered
- A number of minor fixes

5.3

2014年06月25日

- The string factor measurement has been improved for thinner strings (e.g. Badminton).
- Sorting racquets in History.
- Strange characters appearing in the racquet list in some languages has been fixed.
- Other minor fixes.

5.2.1

2014年05月03日

- Annoying update dialog removed.
- iOS 5 fix.

New in 5.2
- Additional sound analyzis algorithm (FFT) to handle difficult racquets.
- Microphone sensitivity can be set on newer iPhones to handle weak sounds (e.g. badminton racquets).
- A default unit can be set in Tension.
- Easier to select brand and string when searching the online database.
- More consistent interface in Tension.
- Translation in the info dialogs (Google translate, so sometimes a bit weird).
- Other minor fixes and updates.

5.2

2014年04月25日

- Additional sound analyzis algorithm (FFT) to handle difficult racquets.
- Microphone sensitivity can be set on newer iPhones to handle weak sounds (e.g. badminton racquets).
- A default unit can be set in Tension.
- Easier to select brand and string when searching the online database.
- More consistent interface in Tension.
- Translation in the info dialogs (Google translate, so sometimes a bit weird).
- Other minor fixes and updates.

5.1

2014年01月30日

- Fixed an error in machine tension when saving tests.
- Improved stability in Swingweight.
- Other minor fixes and updates.

5.0

2013年12月18日

- New design.
- Much improved search, save, and contribution to the online string data base.
- Display history while measuring (tap on the sound curve).
- Sound frequency as a display option.
- Improvements and fixes in the history curve
- Other interface improvements.
- Documentation improvements (more info buttons, Q&A in Guide etc)
- Several minor updates and fixes

4.8

2013年10月02日

Interface adaptions for iPhone 5s & 5c
The ability to edit racquets and strings has been restored

4.7

2013年09月26日

- Some iOS 7 interface adaptions
- More consistent use of inch and oz in the Swing calculator
- Fixed a crash on iOS 7
- Other smaller fixes

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