While the Apple Pencil is designed as a sketching tool for creative professionals, MacRumors reader Simon Gladman has created three Swift demo apps that show the accessory being used for three unconventional purposes -- as a weight scale, controlled synthesizer and 3D controller for image editing.
PencilScale, based on Goodman's Plum-O-Meter, is an experimental app that uses a homemade harness to turn the Apple Pencil into an electronic scale that is highly sensitive, but not incredibly accurate.
The experiment works by subtracting the touch's force from a base weight, which is "set as the current touch force when the 'zero' button is pressed," and multiplying it by 140 for a very rough weight in grams.
PencilController is an experimental image processing app that uses the Apple Pencil as a controller for the fine setting of parameters on Core Image filters.
The demo has three image filtering modes:
Hue/Saturation - Apple Pencil's azimuth angle controls hue and its altitude angle controls the saturation
Brightness/Contrast - Apple Pencil's altitude angle along North/South controls contrast and the angle along West/East controls brightness
Gamma/Exposure - Apple Pencil's altitude angle along North/South controls exposure and the angle along West/East controls gamma
Gladman explains that "the app uses a spring loaded pattern, so the user needs to hold down one of the mode keys in the bottom left of the screen to stay in the filtering mode."
The source code for all three projects is available on GitHub.
I know this is sounds cool. But come on guys I'm tired of hearing this non-sense use of technology. There is abviously a much better device for such thing and it doesn't cost a lot of money to have one. I'm talking about the scale and somebody did it on iPhone 6S 3D Touch too. It's because you can it doesn't mean you have too.
Hi!
I'm actually the same guy that did the "Plum-O-Meter" for weighing things on an iPhone :)
Of course there are better devices, but I'm interested in experimenting, tinkering and playing then seeing what results. Actually, using the Pencil as a controller works really well for the fine adjustments in the image processing app and the fact the it has five degrees of freedom makes it a unique input device for the audio app.
Without some left field thinking, we'd all be using abacuses!
I know this is sounds cool. But come on guys I'm tired of hearing this non-sense use of technology. There is abviously a much better device for such thing and it doesn't cost a lot of money to have one. I'm talking about the scale and somebody did it on iPhone 6S 3D Touch too. It's because you can it doesn't mean you have too.
yeah, why would anyone ever want to do things?
i, for one, am witnessing exactly what i'd hope would start happening upon the release of a new device: tinkering, feedback, and constructive criticism. i'm sorry you're tired, i hear energy drinks are all the rage nowadays.
Aren't the phrases "Highly Sensitive" and "Not Incredibly Accurate" a bad combination under pretty much any circumstance?
Nope, from a scientific terminology perspective, that actually makes perfect sense.
Accuracy, scientifically speaking, is how close to the real value a measurement will produce.
Precision (aka sensitivity) is how small of a quantity you can measure, accurately or otherwise.
And repeatability is how close to the same value taking the same measurement at two different times will produce, accurately, precisely, or otherwise.
So: An accurate scale will tell you something weighs 502 grams when it weighs 502 grams. A precise scale will tell you that something weighs 498.93 grams, although it might actually weigh 502.00 grams if the scale is not also accurate. And a repeatable (and precise) scale will tell you that something weighs 498.93 grams every time you weigh it, although if it's not also accurate it might really weigh 502 grams.
This particular "scale", silly or otherwise, will give you a lot of digits of precision on the weight measurement, so it's quite precise. It however isn't calibrated at all, so the accuracy is bad. No idea whether it's repeatable or not.
I know this is sounds cool. But come on guys I'm tired of hearing this non-sense use of technology. There is abviously a much better device for such thing and it doesn't cost a lot of money to have one. I'm talking about the scale and somebody did it on iPhone 6S 3D Touch too. It's because you can it doesn't mean you have too.
Jesus ****ing christ, it's called EXPERIMENTATION. People EXPERIMENT with various devices and tools to create fun stuff. Maybe in real life it's incredibly pointless (there are better devices/software for cheap), but from a pure technical standpoint, it's very interesting.
Wednesday September 9, 2026 2:15 pm PDT by Juli Clover
The iPhone Duo will work with the Apple Pencil, but support is limited. Apple says that you need the Apple Pencil with USB-C for the iPhone Duo, so if you have the Apple Pencil Pro, you may be out of luck.
It's likely the iPhone Duo doesn't support the Apple Pencil Pro because there's no magnetic surface for charging the pencil. The Apple Pencil Pro charges magnetically when connected to a...
Wednesday September 9, 2026 4:06 am PDT by Tim Hardwick
Apple's foldable iPhone Duo will come with Apple Pencil support, reports Bloomberg's Mark Gurman. Gurman previously claimed that Apple had prototyped a dedicated Apple Pencil for its foldable iPhone that was "stubbier than the versions for iPads" and "designed to magnetically attach and charge on the side of the device," but he said it was unlikely that the accessory would be released....
Sunday September 20, 2026 7:47 pm PDT by Joe Rossignol
A shorter Apple Pencil for the iPhone Duo was in development, but Apple scrapped it due to "technical problems ahead of mass production," according to Bloomberg's Mark Gurman.
Instead, Apple said the iPhone Duo will gain support for the existing USB-C version of the Apple Pencil later this...
Apple's first foldable iPhone, with a book-style design featuring a 5.4-inch outer display and a 7.6-inch inner display with a minimal crease down the middle.
Top Rated Comments
I'm actually the same guy that did the "Plum-O-Meter" for weighing things on an iPhone :)
Of course there are better devices, but I'm interested in experimenting, tinkering and playing then seeing what results. Actually, using the Pencil as a controller works really well for the fine adjustments in the image processing app and the fact the it has five degrees of freedom makes it a unique input device for the audio app.
Without some left field thinking, we'd all be using abacuses!
Cheers!
Simon
.....As a side note, those two phrases remind me of almost every girlfriend I've ever had, the first phrase typically causing the second.... ;)
i, for one, am witnessing exactly what i'd hope would start happening upon the release of a new device: tinkering, feedback, and constructive criticism. i'm sorry you're tired, i hear energy drinks are all the rage nowadays.
Accuracy, scientifically speaking, is how close to the real value a measurement will produce.
Precision (aka sensitivity) is how small of a quantity you can measure, accurately or otherwise.
And repeatability is how close to the same value taking the same measurement at two different times will produce, accurately, precisely, or otherwise.
So: An accurate scale will tell you something weighs 502 grams when it weighs 502 grams. A precise scale will tell you that something weighs 498.93 grams, although it might actually weigh 502.00 grams if the scale is not also accurate. And a repeatable (and precise) scale will tell you that something weighs 498.93 grams every time you weigh it, although if it's not also accurate it might really weigh 502 grams.
This particular "scale", silly or otherwise, will give you a lot of digits of precision on the weight measurement, so it's quite precise. It however isn't calibrated at all, so the accuracy is bad. No idea whether it's repeatable or not.