# SwingTool - Swing Weight > Measures swing weight of sports equipment using iPhone's sensors. (iPhone/iPad app by Sten Kaiser.) - Source: https://appshunter.io/ios/app/swingtool-swing-weight/id408209116 (this page in markdown: same URL + `.md`) - Developer: [Sten Kaiser](https://appshunter.io/developer/309325742) - Category: Sports, Utilities - Price: $1.99 - Rating: 4.20/5 from 17 App Store ratings · 24 written reviews indexed - Age rating: 4+ - Requires: iOS 8.0 · 2 MB - Languages: American English - Released: 2010-12-15 - Data updated: 2026-08-20 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/swingtool-swing-weight/id408209116/reviews.md ## What is SwingTool? SwingTool can quickly and easily measure the swing weight of tennis racquets, golf clubs, baseball bats etc. Swing weight is the most important parameter when deciding how a racquet, club or bat feels when you swing it. Unfortunately measuring swing weight has been fairly complicated, until now. With SwingTool it is enough to just hang your equipment and let it swing like a pendulum. Place the iPhone close to the swinging end and it will automatically display the swing weight. Characteristics - Can be used for all types equipment - Choose any point to calculate the swing weight at - Choose any point to hang the equipment at (independent of the swing point) - Faster and more accurate than the traditional way to measure swing weight - Can be used to measure the swing time of any pendulum with 0.01 s accuracy A demo video is available at appmaker.se/swingTool To golfers: With this app you do MOI-matching i.e. it measures the real dynamic swing weight (moment of inertia). Not the static Lorythmic balance point (D9, C4 etc) that sometimes is called swing weight. ## Key features - Measures swing weight of various sports equipment - Calculates swing weight at any chosen point - Independent swing point and hanging point selection - Faster and more accurate than traditional methods - Measures pendulum swing time with 0.01s accuracy - Performs MOI-matching for dynamic swing weight ## Recent user reviews (10 of 24) All indexed reviews: https://appshunter.io/ios/app/swingtool-swing-weight/id408209116/reviews.md ### 1/5 — App crashes *2026-02-15* App crashes upon opening. Doesn’t work. Apple should take off their approves app list site. ### 5/5 — Works really well! *2025-09-07* I downloaded this app because I wanted to tune my tennis racket without spending $300 on a swing weight machine. I found it to be very accurate and easy to use. However, the instructions on how to use it are lacking, so I recommend watching the only YouTube video that talks about this app to help you get started. Look for the video from the channel “No Limit Tennis” titled "How to Measure Swingweight Without a Machine." This should guide you through the setup process. Overall, I have been very pleased with the app! ### 5/5 — A nice addition for this tool *2023-10-11* Nice addition this tool would be to manually input seconds to check formula. ### 5/5 — Great value! *2022-01-05* Excellent inexpensive app for measuring swing weight of tennis racquets. ### 3/5 — Okay *2021-04-22* When used properly I think it is pretty accurate but the app sometimes gives fluctuating swingweight numbers at times despite same numbers inputed ### 5/5 — Insane *2021-04-14* Dude wthell this app is the only way for us recreational players to mesure swingweight without spending hundreds of dollars in a hefty machine!!! 5 stars easyy Pretty accurate (+/- 3 kg/cm2), easier than recording and counting time lapses on a computer. Thanks to prospect customization for letting me know such a good app ### 1/5 — Awful app *2020-08-23* It’s very hard to use and the error messages are not clear enough. ### 5/5 — Great tool - very accurate *2019-11-03, version 2.1* Works great, measured the swingweight of two tennis racquets and got resuts that were within 1 or 2 points of the results I got from a Prince machine. I highly recommend this app. ### 5/5 — Swingweight!!! *2019-09-21* Best swingweight tool! Buy it! ### 5/5 — Excelent *2019-06-11* Simplify your tenis racquet customization. ## Frequently asked questions about SwingTool ### What is SwingTool used for? SwingTool is used to measure the swing weight of sports equipment such as tennis racquets, golf clubs, and baseball bats. It helps users understand how their equipment feels during a swing by measuring its dynamic moment of inertia. ### How does SwingTool measure swing weight? SwingTool uses the iPhone's sensors to measure swing weight. You hang the equipment like a pendulum and place the iPhone near the swinging end, and the app automatically calculates the swing weight. ### What sports equipment can SwingTool measure? SwingTool can be used for all types of sports equipment, including tennis racquets, golf clubs, and baseball bats. It is designed to measure the swing weight of any pendulum-like object. ### Is SwingTool accurate? Yes, SwingTool is designed to be faster and more accurate than traditional methods for measuring swing weight. It can also measure the swing time of any pendulum with 0.01 s accuracy. ### What is MOI-matching in SwingTool? For golfers, SwingTool performs MOI-matching, which measures the real dynamic swing weight (moment of inertia). This is distinct from static balance points like D9 or C4, which are sometimes also referred to as swing weight. ### What devices does SwingTool support? SwingTool is available for iPhone, iPad, and iPod. It requires iOS 4.0 or later. ### How much does SwingTool cost? SwingTool is a paid application, priced at $1.99. There are no in-app purchases or subscriptions required. ### When was SwingTool last updated? The latest version of SwingTool, 2.1, was last updated on March 22, 2017. It was originally released on December 15, 2010. ## Version history (last 5 releases) ### 2.1 — 2017-03-22 This update from Apple will improve the functionality of this app. No new features are included. - Decimal comma in relevant countries. - A new twist weight guide. - Interface improvements on some devices. - Camera light on supported iPads. ### 2.0 — 2014-07-27 - New interface. - iPad adaption. - Improved data filtering. - Camera light on supported devices. ### 1.9 — 2013-10-11 Detection improvements Some iOS 7 compability fixes ### 1.8 — 2013-09-26 Fixed a crash on iOS 7 ### 1.7 — 2013-09-08 - Documentation improvements. - Improvements for better compatibility with future systems ## Apps similar to SwingTool | App | Rating | Price | Category | | --- | --- | --- | --- | | [Direct Tennis](https://appshunter.io/ios/app/direct-tennis/id1613818171) | 3.8 (16) | Free | Sports | | [RacketTune](https://appshunter.io/ios/app/rackettune/id6746103106) | 3.5 (2) | Free | Sports | | [String Master - Tennis Log](https://appshunter.io/ios/app/string-master-tennis-log/id6757102423) | 5.0 (7) | Free | Sports | | [RacquetTuner](https://appshunter.io/ios/app/racquettuner/id6755720177) | 1.0 (1) | Free | Sports | | [Intuitive Tennis](https://appshunter.io/ios/app/intuitive-tennis/id1614768143) | 4.8 (34) | Free | Sports | | [Briffidi SW1](https://appshunter.io/ios/app/briffidi-sw1/id1569982821) | 5.0 (7) | Free | Sports | ## More apps by Sten Kaiser - [SeeLevel - visual clinometer](https://appshunter.io/ios/app/seelevel-visual-clinometer/id333213338) - [RacquetTune - String Tension](https://appshunter.io/ios/app/racquettune-string-tension/id365729342) - [SpeedClock - Video Radar](https://appshunter.io/ios/app/speedclock-video-radar/id400876654) - [SprintTimer - Photo Finish](https://appshunter.io/ios/app/sprinttimer-photo-finish/id430807521) - [FitnessMeter - Test & Measure](https://appshunter.io/ios/app/fitnessmeter-test-and-measure/id477488986) All apps by Sten Kaiser: https://appshunter.io/developer/309325742 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-20.*