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.
TENNIS TENSION LAB
Tension Lab: String Tension
Measure. Track. Restring.
Check your racquet in a few taps, follow tension loss over time, and know when a fresh string job could bring back the feel you trust.
1,334Racquets
8 SCREENS · ONE CLEAR WORKFLOW
See your strings change. Play with confidence.
Measure string tension, track every change, and plan your next restring.
HOW IT WORKS
Measurement guide
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.
DATABASE
1,334 · 216 · 1,301
1,339 racquets · 216 strings Find your setup in seconds.
STRING TENSION KNOWLEDGE
Tension guide
Check your racquet in a few taps, follow tension loss over time, and know when a fresh string job could bring back the feel you trust.
01
Tension guide Why Does the App Reading Differ from the Requested 52 lb?
A 52 lb request at the shop and a 47 lb app reading do not automatically prove a 5 lb stringing error. The values can represent different things at different times and under different measurement methods, so label them correctly first.
02Why Does the Number Change Every Time You Measure?
When a reading moves around, check racquet support, excitation point, ambient noise, and input values before blaming the sensor.
03Right After Stringing or the Next Day: When Should You Measure?
An immediate post-stringing reading and a next-day reading are not competing “true” tensions. Strings relax over time after installation, so the key is to choose a repeatable measurement time and record whether the racquet has been played.
04A 1-Minute Log That Makes Your Next Restring Easier
“It felt fine last time” is not enough to reproduce the next stringing job. A 1-minute log keeps the process setting, current condition, and on-court result separate while preserving the minimum useful context for the next choice.
05When to Restring Before the String Breaks
A string can change in launch angle, snapback, and feel before it breaks, so the calendar and appearance alone do not determine restringing time.
06Finding Your First Reference Tension
Rather than copying a professional’s number, first create a starting point you can retest with your own racquet and strings.
READY FOR YOUR NEXT HIT?
Time to restring? Never leave it to guesswork.
Check your racquet in a few taps, follow tension loss over time, and know when a fresh string job could bring back the feel you trust.