MyPowerTennis – Press releases (English)
Software Beinhofer · https://mypowertennis.app/presse/en/
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All texts are cleared for editorial use, including in shortened
form. Credit appreciated but not required.


SHORT VERSION (approx. 80 words)
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Tennis app measures stroke speed without an extra sensor

MyPowerTennis turns the Apple Watch into a stroke analyser: the app measures
racquet head and wrist speed, automatically detects forehand, backhand and
serve, and rates movement quality with a dedicated metric. Impact detection
runs at 800 Hz. Unlike comparable systems, the app needs no sensor mounted on
the racquet. All analysis happens on the device. MyPowerTennis will be released
on the App Store on 23 September 2026 in five languages. Developed by Software Beinhofer, Lower
Austria.


LONG VERSION (approx. 400 words)
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How fast is my serve? An Apple Watch is enough to answer

Until recently, amateur tennis offered two answers to that question: a radar
gun costing several thousand euros, or a sensor clipped to the racquet handle
that changes how the racquet feels. MyPowerTennis, developed in Lower Austria,
takes a third route – it uses only the motion sensors of the Apple Watch that
many players already wear.

Two values are measured: racquet head speed, derived from angular velocity and
racquet radius, and wrist speed as a drift-damped integration of acceleration
data. Both appear on the watch immediately after the stroke, colour-coded from
blue to red.

The technically notable part is impact detection. At the usual sampling rate of
100 Hz it is possible to tell that ball contact occurred – but not precisely
when. MyPowerTennis therefore samples the sensors at 800 Hz on newer Apple
Watch models and pinpoints the moment of impact to within a few milliseconds.
From this it derives acceleration time, follow-through time and a timing index.

The app also detects the stroke type automatically – forehand, backhand or
serve – estimates spin tendency and reconstructs the path of the wrist through
the swing. A dedicated metric rates the consistency of the movement, that is,
quality independent of raw speed. Each stroke receives a score from 0 to 100.

The developer is explicit about the limits of the method: racquet head speed is
a radius-based estimate with a deviation of roughly 10 to 20 per cent; wrist
speed lies between 5 and 15 per cent. What is measured is the racquet, not the
ball. The value therefore lies in comparison over time – between strokes,
sessions and training phases.

Sessions are stored on the device and optionally synced across iPhone, iPad and
Watch through the user's private iCloud. There are no proprietary servers and
no tracking. Data can be exported as CSV, PDF or a JSON archive.

MyPowerTennis comes from Heinrich Beinhofer, a software developer and club
player at ATSV Tulln. The idea grew out of practice: when you change a
movement, you rarely sense reliably whether it got better or worse – instinct
deceives. A measured number after every stroke makes the difference visible,
drill by drill.


FACT SHEET
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Name            MyPowerTennis
Category        Sports / Health & Fitness
Platform        iPhone and iPad (iOS/iPadOS 18.2+), Apple Watch (watchOS 11+)
Hardware        Apple Watch Series 6 / SE (2nd gen.) or later;
                800 Hz impact timing from Series 8 and Ultra
Extra hardware  none – no racquet sensor, no camera, no tripod
Features        racquet head and wrist speed (km/h or mph), impact timing,
                automatic stroke detection, spin tendency, swing path,
                precision metric, stroke score 0–100, history and trends
Export          CSV, PDF, JSON archive
Privacy         analysis on device, sync via the user's private iCloud,
                no proprietary servers, no tracking
Languages       German, English, Spanish, French, Italian
Price           EUR 6.99 - one-time purchase, no subscription,
                no in-app purchases (prices vary by region)
Status          App Store release on 23 September 2026,
                open beta via TestFlight until then
Developer       Software Beinhofer, Hauptstrasse 18, 3464 Perzendorf, Austria
Contact         heinrich@beinhofer.com
Web             https://mypowertennis.app


ABOUT THE MATERIAL IN THIS PACKAGE
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screenshots/    Six views at original resolution (1206 x 2622 px),
                German user interface
icon/           App icon, 1024 px
video/          Introduction (40 s, portrait, filmed on court) and explainer
                (1 min, 16:9, measurement principle and features),
                each with a still image
Text versions   PRESSETEXTE-DE.txt, PRESS-RELEASES-EN.txt,
                COMUNICADOS-DE-PRENSA-ES.txt,
                COMMUNIQUES-DE-PRESSE-FR.txt, COMUNICATI-STAMPA-IT.txt

Note: the app is also localised in Italian; the videos are currently
available in German only. A transcript of the on-screen text for
subtitling is available on request.

Usage rights: free for editorial use.
Apple, Apple Watch and App Store are trademarks of Apple Inc.
