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

At this time, we begin the information with one thing fairly curious: Do you know that you should use your MacBook trackpad as a scale? Nicely, that’s fairly spectacular, don’t you suppose so? It’s all potential because of Krish Shah, a Canadian developer and blogger, who launched an experimental macOS utility referred to 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 beneath the MIT License on GitHub.

TrackWeight works by decoding stress information captured by the Power Contact sensors. Nevertheless, 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 influence measurement accuracy, the outcomes have confirmed to be “fairly correct” in sensible use.

The app’s performance is supported by a mix of growth instruments, together with SwiftUI for the consumer interface and Mix for dealing with information circulation. Shah additionally credit current 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 prime of a weighing scale and recording a video whereas including stress, then evaluating frames.

You’ll be able to 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. Nevertheless, 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 embody Power Contact trackpads—particularly, MacBook Professional (2015 or newer) and MacBook (2016 or newer) fashions. Customers should guarantee the item being weighed matches inside the bodily dimensions of the trackpad. Moreover, metallic objects could trigger errors in studying as a consequence of false capacitive detection; Shah recommends inserting such gadgets on a paper towel to keep away from misreadings.

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

In essence, TrackWeight is a intelligent, low-stakes hack that demonstrates the artistic 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 gadgets in unintended methods.

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