Akhil Mattaparthi 
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LiveWebTennis
Swing your arm at your webcam to play 3D tennis in browser
Your webcam tracks your body and turns real arm swings into tennis shots. Swing hands for forehand, backhand, or serve a 3D avatar mirrors your movement in real time. No download, no controller, no signup. Just open the URL and play. Ball physics use real ATP match data topspin curves down, slice skids low, serves hit 130mph. Play solo against AI or multiplayer against real opponents worldwide. Built in 2 weeks, 1,300+ players from 50+ countries. Zero ad spend. Under 1MB.
Top comment
I built this for a hackathon and it kind of blew up 1,300 players from 50+ countries in the first week with no marketing budget. The idea: what if Wii Sports ran in your browser and your webcam was the controller? How it works: Google's MediaPipe tracks 33 body landmarks from your webcam at 30fps. Those get mapped onto a 3D avatar in Three.js. A custom physics engine handles ball flight with gravity, air drag, and Magnus force for spin all calibrated against real professional match data from 689 Federer matches. The game detects forehand, backhand, serve, and slice purely from how you move your arm. No buttons, no keyboard, no gamepad. The hardest part wasn't the code it was the physics tuning. Single-camera depth estimation is noisy, and naive smoothing kills responsiveness during fast swings. Took days to get the One Euro Filter dialed in so it feels smooth at rest but snappy when you swing. What surprised me most: 60% of visitors actually play. Typical browser game conversion is 10-30%. Turns out removing every friction point (no download, no signup, no hardware) changes behavior dramatically. Would love for you to try it and tell me: does it feel like tennis? What shot did you try first? What broke?
About LiveWebTennis on Product Hunt
“Swing your arm at your webcam to play 3D tennis in browser ”
LiveWebTennis was submitted on Product Hunt and earned 5 upvotes and 1 comments, placing #31 on the daily leaderboard. Your webcam tracks your body and turns real arm swings into tennis shots. Swing hands for forehand, backhand, or serve a 3D avatar mirrors your movement in real time. No download, no controller, no signup. Just open the URL and play. Ball physics use real ATP match data topspin curves down, slice skids low, serves hit 130mph. Play solo against AI or multiplayer against real opponents worldwide. Built in 2 weeks, 1,300+ players from 50+ countries. Zero ad spend. Under 1MB.
On the analytics side, LiveWebTennis competes within Sports, Web3 and Webcam — topics that collectively have 19.3k followers on Product Hunt. The dashboard above tracks how LiveWebTennis performed against the three products that launched closest to it on the same day.
Who hunted LiveWebTennis?
LiveWebTennis was hunted by Akhil Mattaparthi . A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of LiveWebTennis including community comment highlights and product details, visit the product overview.