Stringbed: String Tension

Tennis string & racket guide

Only for iPhone

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Stop guessing your string tension. Your first answer gives the pounds for your racket and swing, free. The string to ask for and unlimited answers: one payment. Which string to ask for, and how many pounds — for your racket and the way you play. Answer a few plain questions; “I don’t know” always counts. Your first number is free; the string to ask for and unlimited answers come with one payment. No subscription. No account. 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 • with Unlimited answers: one string to use, named with its thickness and the reason, plus up to 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 — the pounds and why — is free. The string to ask for, and every answer after that, open with one payment, 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 has not received enough ratings or reviews to display an overview.

• The free first answer gives your pounds and the reasons; the string to ask for and its alternatives come with Unlimited answers. Answers you already opened stay open.

Version 1.3

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.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Size
    7.3 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.
    Languages
    English and 2 more
    • English, French, Korean
    Age Rating
    4+
    In-App Purchases
    Yes
    Provider
    Laure Shin
    • Laure Shin has not identified itself as a trader for this app. If you are a consumer in the European Economic Area, consumer rights do not apply to agreements between you and the provider.
    Copyright
    © 2026 Jonghyuk Park
  • Privacy Policy

    • More by Laure Shin

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