Tension Lab: String Tension
Measure. Track. Restring.
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Your strings change every time you play. Tennis Tension Lab helps you see that change before it surprises you on court.
Place your phone beside the racquet and tap the center of the string bed three to five times. The app analyzes the sound on your device and gives you a repeatable tension estimate in seconds.
KEEP YOUR SETUP CLEAR
• Check current string tension
• Compare each reading with the baseline from a fresh string job
• Follow tension loss on a simple timeline
• See when it may be time to restring
• Keep every racquet, string job, hybrid setup and note together
• Find models quickly in a catalog of 1,347 racquets and 216 strings
• Compare string characteristics before choosing your next setup
MADE FOR THE COURT
No account is required to start. Tap audio is analyzed in memory and discarded; only measurement results are saved. Choose lb or kg and keep your history organized by racquet.
For the most consistent results, measure the same racquet in a quiet place with the same tapping method. Readings are estimates based on sound and equipment information, not certified measurements from a stringing machine.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Improvements to usability and stability.
The developer, SEOKWON KONG, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Location
- User Content
- Identifiers
- Usage Data
- Diagnostics
- Other Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- SEOKWON KONG
- Size
- 79.4 MB
- Category
- Sports
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 39 more
- English, Afrikaans, Arabic, Bengali, Czech, Danish, Dutch, Filipino, Finnish, French, German, Greek, Hebrew, Hindi, Hungarian, Indonesian, Italian, Japanese, Kazakh, Korean, Malay, Mongolian, Nepali, Norwegian Bokmål, Persian, Polish, Portuguese, Romanian, Russian, Simplified Chinese, Spanish, Swahili, Swedish, Thai, Traditional Chinese, Turkish, Ukrainian, Urdu, Uzbek, Vietnamese
- Age Rating
13+
- 13+
- Contains
Messaging and Chat
User-Generated Content
Social Media
- Copyright
- © 2026 SEOKWON KONG