Resources for your coverage
Press releases, fact sheet, screenshots and video – all free for editorial use. A short email is enough to get review access.
The app in one sentence
MyPowerTennis turns the Apple Watch into a stroke analyser: it measures racquet head and wrist speed, automatically detects forehand, backhand and serve, and rates every stroke on a scale of 0 to 100 – with no sensor on the racquet and no camera.
Press releases
Both versions may be used as they are, or shortened. As a text file: German · English · Spanish · French · Italian. The press texts are thus available in all five languages the app is localised in. This page itself exists in German and English.
Short version (approx. 80 words)
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 several languages. Developed by Software Beinhofer, Lower Austria.
Long version (approx. 400 words)
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
| Name | MyPowerTennis |
|---|---|
| Category | Sports / Health & Fitness |
| Platform | iPhone and iPad (iOS/iPadOS 18.2 or later), Apple Watch (watchOS 11 or later) |
| Hardware | Apple Watch Series 6 / SE (2nd generation) or later; 800 Hz impact timing from Series 8 and Ultra |
| Additional 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 | €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 |
| Web | mypowertennis.app |
Media assets
All screenshots at original resolution, plus app icon, both videos and the press texts in German, English and Italian as one package:
Videos
Introduction (40 s, portrait) – filmed on court, understandable without sound. Watch · Download MP4 (11 MB)
Explainer (1 min, 16:9) – covers the measurement principle and the main features, well suited for embedding in online articles. Watch · Download MP4 (5 MB)
Both videos carry German narration and on-screen text. An English or Italian version is not available at present – on request I am happy to supply a transcript of the on-screen text for subtitling.
Usage rights
Images, video and text on this page are free for editorial use, including in shortened form. Crediting “MyPowerTennis / Software Beinhofer” is appreciated but not required. Apple, Apple Watch and App Store are trademarks of Apple Inc.
Review access & contact
A short email is enough to receive free full access – you will get a code that unlocks the app at no cost. One note for testing: measurement requires real stroke movements; the Apple Watch provides no motion data in the simulator.
I am happy to answer detailed questions about the measurement method – in experience that is where most questions arise. Contact: Heinrich Beinhofer, Software Beinhofer, Perzendorf, Lower Austria.