Stringbed: String Tension
Tennis string & racket guide
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Type your racket, answer a few plain questions, and get the pounds to ask your stringer for. Your first answer is free; one payment unlocks the rest. No subscription.
Tennis Stringbed does one thing: it tells you which string to ask for and how many pounds to have it pulled at — for your racket, and for the way you actually play.
No account. No subscription. Nothing collected by us.
HOW IT GOES
You answer a few plain questions: how you hit, how often you play, what is in the racket now, whether your arm bothers you afterwards. A band on a fixed 40–62 pound scale narrows while you answer, so you can watch the answer being found. “I don’t know” is a real answer at every step — the app keeps it as unknown and widens the band instead of guessing quietly.
When there is enough to settle, the band lands on a number and you get:
• the exact pounds for the up-and-down strings and for the side-to-side strings
• one string to use, named with its thickness and the reason, plus two alternatives
• one sentence to say at the counter
• “Why these numbers” — which of your answers moved the number, and by how much
• what the app still does not know, and how far that moves the middle
TELL IT HOW IT PLAYED, AND THE NEXT NUMBER LISTENS
After you play the bed, say how it felt — too harsh, too soft, or just right — and whether the strings broke fast. Your next answer for that racket moves by a small, bounded step and says why in one line. Strings that keep breaking point you to a thicker gauge. When a restring is due, the Rackets screen says so (no notifications).
THE SAME ANSWERS ALWAYS GIVE THE SAME NUMBER
The number comes from a built-in model of how a string bed behaves: head size, string pattern, frame stiffness, string material and thickness. It does not drift with how you phrase things and it does not change its mind overnight. That is the point — it gives you one steady starting point, and from there you can go a pound up or a pound down and find what you like.
TYPE IT AND THE RACKET DRAWS ITSELF
Type what is printed on your frame. There is no long list to scroll: as the letters agree, the racket narrows down to itself, and what the app knows about it — head size, string pattern, the range printed on the frame — appears with the page it was read from. If it cannot find your racket, it says so plainly and asks how the racket feels to hit instead.
EVERYTHING IS ALREADY INSIDE
165 racket models and 195 strings ship inside the app, every row carrying the published page it came from (Settings → Sources). Every answer is worked out on your iPhone from data built into the app. The only thing that needs the internet is an optional web search for the string you were given, and you decide whether to tap it.
WHAT IT COSTS
Free to download. Your first settled answer is free. After that, one payment opens unlimited answers forever — not a subscription, no credits, nothing metered, nothing to renew. Restore Purchases sits in Settings.
Recording what you actually had strung, and how it played, is free before and after any purchase.
WHAT IT KEEPS
Nothing reaches us. There is no account, no sign-in, no analytics, no advertising and no server of ours anywhere. What you enter stays on your devices. If iCloud is on, it syncs through your own private iCloud account — we could not read it if we tried. The only thing the app opens outward is a web search for the string, in Safari, with no tracking added and no affiliate link; we earn nothing from it and get nothing back.
FOR THE PLAYER, NOT FOR THE SHOP
Tension, thickness and string type are explained in ordinary words before they are ever named. If you have never chosen a string in your life, you can still answer every question honestly — including “I don’t know”.
This is about your strings, not about your health. If pain keeps up after a softer setup, see a doctor.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• One string to use, with the reason and two alternatives — chosen from makers' descriptions and published research.
• Faster, steadier consult screens.
The developer, Laure Shin, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Laure Shin
- Size
- 7.2 MB
- Category
- Sports
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 2 more
- English, French, Korean
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Unlimited answers $14.99
- Copyright
- © 2026 Jonghyuk Park