Mac developers keep finding new ways to make their laptops do things Apple never intended. Earlier this year, an app went viral for making MacBooks moan when slapped. Another unique app lets you feel a webpage’s buttons through the trackpad before you click them. Now, a developer has built one that makes the trackpad purr like a cat.

PurrPad makes use of the Taptic Engine built into MacBook trackpads, so instead of hearing a purr through your speakers, you feel one under your palm. Developer Francesco Pavanetto, who shared the app on Reddit, says he tuned the vibration to the actual measured pitch of a real cat purr and built it so the…

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