RacquetTune - String Tension7.7 - App Store
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Publisher Description
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.
Version History - Fixed the problem with detecting sound on iOS 26.4 and later.
- Fixed an issue with contributing strings to the online database. 7.7 Apr 2 - All weights in swingweight can be removed with a long press on the +Weight button.
- A problem with uploading the database has been fixed. 7.6 02/28/2020 - Easier to pick strings in the online DB.
- A sound detection problem on some device has been improved/fixed . 7.5 12/19/2019 iOS 13 compatibility improvements (dark mode will come later). 7.4 09/25/2019 Picking a racquet will automatically pick the string used last time. 7.3 04/09/2019 - 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. 7.2 01/05/2019 - 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. 7.1 01/02/2019 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 7.0 12/19/2018 - iOS 11 compatibility
- Fixed a database conflict 6.3 10/05/2017 Fixed a problem in the tension display that could cause a crash on some devices. 6.2.1 07/13/2017 - Twistweight in the swingweight calculator.
- The swingweight calculator can display changes as well as absolute values. 6.2 06/28/2017 - Fixed the formatting of the exported testdata in countries with decimal point.
- Fixed a problem with a frozen database that could occur while testing. 6.1 03/24/2017 - 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. 6.0 10/13/2016 - 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. 5.8 02/12/2016 - 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. 5.7 09/01/2015 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. 5.6 06/01/2015 - The tension drop is displayed on the test page
- A number of minor fixes 5.5 10/28/2014 Fixed a crash when deleting a row in History. 5.4.1 10/14/2014 - 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 5.4 09/18/2014 - 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. 5.3 06/25/2014 - 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. 5.2.1 05/03/2014 - 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 04/25/2014 - Fixed an error in machine tension when saving tests.
- Improved stability in Swingweight.
- Other minor fixes and updates. 5.1 01/30/2014 - 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 5.0 12/18/2013 Interface adaptions for iPhone 5s & 5c
The ability to edit racquets and strings has been restored 4.8 10/02/2013
About RacquetTune - String Tension
The company that develops RacquetTune - String Tension is Sten Kaiser. The latest version released by its developer is 7.7.
To install RacquetTune - String Tension on your iOS device, just click the green Continue To App button above to start the installation process. The app is listed on our website since 2026-10-15 and was downloaded 0 times. We have already checked if the download link is safe, however for your own protection we recommend that you scan the downloaded app with your antivirus. Your antivirus may detect the RacquetTune - String Tension as malware if the download link is broken.
How to install RacquetTune - String Tension on your iOS device:
- Click on the Continue To App button on our website. This will redirect you to the App Store.
- Once the RacquetTune - String Tension is shown in the iTunes listing of your iOS device, you can start its download and installation. Tap on the GET button to the right of the app to start downloading it.
- If you are not logged-in the iOS appstore app, you'll be prompted for your your Apple ID and/or password.
- After RacquetTune - String Tension is downloaded, you'll see an INSTALL button to the right. Tap on it to start the actual installation of the iOS app.
- Once installation is finished you can tap on the OPEN button to start it. Its icon will also be added to your device home screen.
Program Details
System requirements
Download information
Pricing
Version History
version 7.7
posted on 2026-10-15
Version History - Fixed the problem with detecting sound on iOS 26.4 and later.
- Fixed an issue with contributing strings to the online database. 7.7 Apr 2 - All weights in swingweight can be removed with a long press on the +Weight button.
- A problem with uploading the database has been fixed. 7.6 02/28/2020 - Easier to pick strings in the online DB.
- A sound detection problem on some device has been improved/fixed . 7.5 12/19/2019 iOS 13 compatibility improvements (dark mode will come later). 7.4 09/25/2019 Picking a racquet will automatically pick the string used last time. 7.3 04/09/2019 - 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. 7.2 01/05/2019 - 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. 7.1 01/02/2019 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 7.0 12/19/2018 - iOS 11 compatibility
- Fixed a database conflict 6.3 10/05/2017 Fixed a problem in the tension display that could cause a crash on some devices. 6.2.1 07/13/2017 - Twistweight in the swingweight calculator.
- The swingweight calculator can display changes as well as absolute values. 6.2 06/28/2017 - Fixed the formatting of the exported testdata in countries with decimal point.
- Fixed a problem with a frozen database that could occur while testing. 6.1 03/24/2017 - 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. 6.0 10/13/2016 - 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. 5.8 02/12/2016 - 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. 5.7 09/01/2015 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. 5.6 06/01/2015 - The tension drop is displayed on the test page
- A number of minor fixes 5.5 10/28/2014 Fixed a crash when deleting a row in History. 5.4.1 10/14/2014 - 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 5.4 09/18/2014 - 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. 5.3 06/25/2014 - 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. 5.2.1 05/03/2014 - 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 04/25/2014 - Fixed an error in machine tension when saving tests.
- Improved stability in Swingweight.
- Other minor fixes and updates. 5.1 01/30/2014 - 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 5.0 12/18/2013 Interface adaptions for iPhone 5s & 5c
The ability to edit racquets and strings has been restored 4.8 10/02/2013
version 7.7
posted on 2026-09-03
Version History This app has been updated by Apple to prepare for watchOS 27 compatibility. No new features are included.
- Fixed the problem with detecting sound on iOS 26.4 and later.
- Fixed an issue with contributing strings to the online database. 7.7 Apr 2 - All weights in swingweight can be removed with a long press on the +Weight button.
- A problem with uploading the database has been fixed. 7.6 02/28/2020 - Easier to pick strings in the online DB.
- A sound detection problem on some device has been improved/fixed . 7.5 12/19/2019 iOS 13 compatibility improvements (dark mode will come later). 7.4 09/25/2019 Picking a racquet will automatically pick the string used last time. 7.3 04/09/2019 - 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. 7.2 01/05/2019 - 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. 7.1 01/02/2019 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 7.0 12/19/2018 - iOS 11 compatibility
- Fixed a database conflict 6.3 10/05/2017 Fixed a problem in the tension display that could cause a crash on some devices. 6.2.1 07/13/2017 - Twistweight in the swingweight calculator.
- The swingweight calculator can display changes as well as absolute values. 6.2 06/28/2017 - Fixed the formatting of the exported testdata in countries with decimal point.
- Fixed a problem with a frozen database that could occur while testing. 6.1 03/24/2017 - 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. 6.0 10/13/2016 - 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. 5.8 02/12/2016 - 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. 5.7 09/01/2015 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. 5.6 06/01/2015 - The tension drop is displayed on the test page
- A number of minor fixes 5.5 10/28/2014 Fixed a crash when deleting a row in History. 5.4.1 10/14/2014 - 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 5.4 09/18/2014 - 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. 5.3 06/25/2014 - 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. 5.2.1 05/03/2014 - 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 04/25/2014 - Fixed an error in machine tension when saving tests.
- Improved stability in Swingweight.
- Other minor fixes and updates. 5.1 01/30/2014 - 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 5.0 12/18/2013 Interface adaptions for iPhone 5s & 5c
The ability to edit racquets and strings has been restored 4.8 10/02/2013
version 7.7
posted on 2026-08-21
Version History This update from Apple will improve the functionality of this app. No new features are included.
- Fixed the problem with detecting sound on iOS 26.4 and later.
- Fixed an issue with contributing strings to the online database. 7.7 Apr 2 - All weights in swingweight can be removed with a long press on the +Weight button.
- A problem with uploading the database has been fixed. 7.6 02/28/2020 - Easier to pick strings in the online DB.
- A sound detection problem on some device has been improved/fixed . 7.5 12/19/2019 iOS 13 compatibility improvements (dark mode will come later). 7.4 09/25/2019 Picking a racquet will automatically pick the string used last time. 7.3 04/09/2019 - 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. 7.2 01/05/2019 - 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. 7.1 01/02/2019 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 7.0 12/19/2018 - iOS 11 compatibility
- Fixed a database conflict 6.3 10/05/2017 Fixed a problem in the tension display that could cause a crash on some devices. 6.2.1 07/13/2017 - Twistweight in the swingweight calculator.
- The swingweight calculator can display changes as well as absolute values. 6.2 06/28/2017 - Fixed the formatting of the exported testdata in countries with decimal point.
- Fixed a problem with a frozen database that could occur while testing. 6.1 03/24/2017 - 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. 6.0 10/13/2016 - 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. 5.8 02/12/2016 - 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. 5.7 09/01/2015 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. 5.6 06/01/2015 - The tension drop is displayed on the test page
- A number of minor fixes 5.5 10/28/2014 Fixed a crash when deleting a row in History. 5.4.1 10/14/2014 - 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 5.4 09/18/2014 - 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. 5.3 06/25/2014 - 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. 5.2.1 05/03/2014 - 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 04/25/2014 - Fixed an error in machine tension when saving tests.
- Improved stability in Swingweight.
- Other minor fixes and updates. 5.1 01/30/2014 - 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 5.0 12/18/2013 Interface adaptions for iPhone 5s & 5c
The ability to edit racquets and strings has been restored 4.8 10/02/2013
version 7.6
posted on 2020-02-28
- 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 7.6
posted on 2020-02-28
Feb 28, 2020 Version 7.6
- 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 5.8
posted on 2010-04-07
version 7.6
posted on 1970-01-01
28 de fev de 2020 Version 7.6
- 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 7.6
posted on 1970-01-01
2020年2月28日 Version 7.6
- 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 7.6
posted on 1970-01-01
28 de feb. de 2020 Version 7.6
- All weights in swingweight can be removed with a long press on the +Weight button.
- A problem with uploading the database has been fixed.
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