So called “active” stylii are NOT Bluetooth stylii. These “active”, capacitive type stylii do not use Bluetooth, at all!!
The use of the term “active” for these types of stylii means it uses some type a battery to send a very small electrical signal to finer tip of the stylus to simulate a finger touch or a response similar to that of any commonplace, easy to obtain capacitive stylii.
Unlike commonplace capacitive that actually transfer and amplify your fingers electrical impulses through an electrically conductive barrel and tip,
An “active” battery powered stylus simulates this by sending its own battery operated, low level signal to a fine point stylus tip, instead of relying on an actual external electrical impulse from your own body/fingers.
Also, with “active” battery powered stylii, the makers of these stylii can make them from differnt materials that do not, necessarily, need to be made from conductive materials.
“Active” stylii are simply battery powered, capacitive-like stylii that need no Bluetooth connection.
Some types of these stylii offer palm rejection. Many do not.
NO “Active” stylii offer any type of screen pressure sensitivity.
So, in many respects, “Active” battery powered stylii work just like any other commonplace, capacitive, non-Bluetooth stylus.
Most “Active” stylii do not offer ANY pressure sensing or palm rejection.
To be able to use these types of “active” stylii ( and I even still recommend with other third party, smart Bluetooth stylii for consistent palm rejection ) and be able to lay your hand/palm/side of palm on the iPad's screen, you need to use a special, non-electrical conducting, lycra-based material drawing glove that works by isolating your hand/palm and allow you to lay your hand/palm on the screen as you draw in these non-compatible Adonit stylus apps.
Something like this found on Amazon.
https://www.amazon.com/Professional-Anti-fouling-Drawing-Tablet-Graphic-Right-Ha nd-Left-Hand/dp/B017R8M2JY/ref=sr_1https://www.amazon.com/Professional-Anti-fouling-Drawing-Tablet-Graphic-Right-Ha
Many more makers of these types of gloves on Amazon.
To date, the ONLY smart, “Bluetooth” stylus I usually, by default, that I always recommend, as it works well with ANY iPad is the Adonit Pixel stylus.
This stylus works very well with a whole range of Apple Pencil unsupported iPads.
Umfortuanely, both Adonit and Amazon are out of stock of these, currently
I contacted Adonit, directly, and they have reported to me the Adonit Pixel will be re-stocked and available, again, by late Jan, early Feb. 2020.
The Adonit Pixel is really THE ONLY smart, Bluettoth stylii that will confidently work with any iPad all the way back to the 2012 iPad 4 generation and the 1st gen iPad Mini!
https://www.adonit.net/jot/pixel/
If you can wait for this stylus to become available, again, this IS the stylus to get.
I still recommend the drawing glove for better, more consistent palm rejection.
Unbelievably, the leader in digital graphics tablets and digital graphics tablet pens, Wacom, have terrible stylii for iPads.
Their only other smart, Bluettoth stylii for iPad is the Wacom Bamboo Sketch and this is simply a disappointing and horrible stylii to use on any iPad.
It even works bad with their “supposedly” iOS compatible Wacom drawing app, Bamboo Paper!
I did a complete negative review of the Wacom Bamboo Sketch on Amazon over two years, ago!
So, I cannot recommend anything from Wacom for any iPad!
If you can't wait, my advice is to simply purchaae a cheaper, simple, commonplace, easy to obtain clear “disc-tipped” type stylus and a drawing glove.
You'll at least be able to lay your hand down on the screen while drawing and the c;lear disc tip makes it more accurate for writing or drawing and the lycra material in the drawing glove makes it easier to glide your hand/palm/side of your hand across the iPad's screen and will leave no “palm” marks on the iPads screen.
Best of Luck to You!