Free Tool — No App to Download
Swing Check
Point your phone. Take a swing. Get instant feedback on your tempo, spine angle, hip rotation, and estimated swing speed.
No sensors. No hardware. No subscription. Just your phone camera and some AI running in your browser.
Works in Safari on iPhone. No download needed. Your video never leaves your phone — all processing happens in your browser.
How to Use It
Position Your Phone
Set your phone 6-8 feet away, at chest height, perpendicular to your target line. Landscape mode works best. Make sure your full body is visible from head to knees. Prop it against a water bottle, range bucket, or tripod — whatever works.
Address the Ball
Stand at address and hold still for a second. The AI locks in your address position — spine angle, hip line, shoulder line. Once it says "Swing when ready," take your normal swing.
Get Instant Feedback
The app tracks your swing in real-time — backswing, top, downswing, impact, and follow-through. It calculates tempo, spine angle, hip and shoulder rotation, head stability, and an estimated swing speed. All in your browser, in about two seconds.
The Honest Truth
This is not a replacement for a launch monitor. It's a free tool that gives you a rough snapshot of your swing from a single camera angle. That's it.
What it can do reasonably well: measure your tempo (the ratio of backswing to downswing time), check your spine angle at address, estimate how much your hips and shoulders rotate, and tell you if your head is staying still through impact.
What it can't do: measure ball speed, launch angle, spin rate, or carry distance. Those require radar or multiple high-speed cameras. The swing speed estimate is rough — within maybe 10-15 mph of reality on a good day.
If you're just starting out and want to check whether your tempo is in the ballpark, this tool helps. If you're dialing in your distances and need precise numbers, you need a real launch monitor. We review those too.
Want Real Numbers?
These are the launch monitors we actually recommend. Pick your budget tier.
Uses your iPhone camera plus radar. Best entry-level option for indoor/outdoor. 12 club data points.
Triple-camera photometric. Club data included. No subscription. The sweet spot of price and performance.
Radar + improved camera. Good accuracy for the price. Great for home sim builds under $5K.
Get Swing Check Updates
We're improving the AI model. New features coming: ball trajectory tracking, club path analysis, and comparison to pro swings. Get notified when we ship updates.