Dev Turns MacBook Trackpad Into A Weighing Scale With A Free Open-Supply App

At the moment, we begin the information with one thing fairly curious: Do you know that you should use your MacBook trackpad as a scale? Effectively, that’s fairly spectacular, don’t you suppose so? It’s all potential due to Krish Shah, a Canadian developer and blogger, who launched an experimental macOS software known as TrackWeight. The app makes use of the stress sensitivity constructed into the MacBook’s trackpad to estimate weight and is now accessible as open-source software program underneath the MIT License on GitHub.

TrackWeight works by deciphering stress information captured by way of the Pressure Contact sensors. Nonetheless, it requires a steady finger contact throughout measurement to keep up the capacitive sensing crucial for operation. Shah notes that whereas this design would possibly barely affect measurement accuracy, the outcomes have confirmed to be “fairly correct” in sensible use.

The app’s performance is supported by a mix of improvement instruments, together with SwiftUI for the consumer interface and Mix for dealing with information stream. Shah additionally credit present work by developer Takuto Nakamura (@Kyome22) and the Open Multi-Contact Help library, which permits entry to detailed trackpad contact metrics like place, stress, angle, and density.

I examined the accuracy by placing my MacBook on high of a weighing scale and recording a video whereas including stress, then evaluating frames.

You may see it’s fairly correct! pic.twitter.com/etP8qlrGCh

— Krish Shah (@KrishRShah) July 21, 2025

The app has limitations typical of experimental instruments. It’s most correct with objects weighing a number of tens of grams, and Shah has efficiently examined it with gadgets as heavy as 3.5 kilograms. Nonetheless, utilizing the app to weigh baggage or an individual is strongly discouraged because of the danger of damaging the laptop computer.

TrackWeight is solely appropriate with MacBook fashions that embrace Pressure Contact trackpads—particularly, MacBook Professional (2015 or newer) and MacBook (2016 or newer) fashions. Customers should guarantee the article being weighed suits inside the bodily dimensions of the trackpad. Moreover, metallic objects might trigger errors in studying resulting from false capacitive detection; Shah recommends putting such gadgets on a paper towel to keep away from misreadings.

Directions for constructing and operating the app can be found on the GitHub web page, however Shah emphasizes that TrackWeight is meant solely for academic and experimental use. It isn’t really useful for industrial functions or any context requiring exact or licensed measurements.

In essence, TrackWeight is a intelligent, low-stakes hack that demonstrates the inventive potential of Apple’s {hardware} — pushing the boundaries of what a laptop computer’s trackpad can do, whereas reminding customers to train warning when repurposing units in unintended methods.

Filed in Apple >Computers. Learn extra about Apple, Macbook Air and Macbook Pro.