Okay,  I installed ubuntu to test Expresii on Linux. And with the help from    devviktoria  (and thanks also to Granham who initiated a Wintab driver implementation for use with WINE), I also fianlly got pen pressure and tilt working under WINE.   I confimred that this driver works with Wacom, XP-Pen and Huion pen tablets, and also on my XP-Pen pen display.

There are still minor issues like minimizing the app would crash it, and  the artwork preview  in the Export dialog being blank.  I will look into these and try to fix them. Overall, I'm so glad Expresii works and performance is on par with on Windows:

1. Install WINE according to their Download page. I used ubuntu 24.04 LTS so  I followed the instructions here.
2. Install Expresii using WINE: After you download Expresii setup program, unzip it and run the installer EXE with the command "wine Expresii-SetupXXXX.exe", where Expresii-SetupXXXX.exe is the exact filename you unzipped. 
3. Install  XWinTab  from here.   The followings screen captures show how to do the sub-steps of installing libxcb-xinput0 and make a DLL override.  I needed to restart ubutntu after installing   libxcb-xinput0  for it to take effect.

To   put the .DLL and .so files  to the same  of Expresii's EXE,  the destination path looks something like "~/.wine/drive_c/Program Files (x86)/Expresii x64". By default, Expresii initially tries to load Wintab32.dll already so unless you picked 'Windows Ink' previously, you don't need to explicitly choose wintab32.dll from within Expresii.  

Now you should be able to run  Expresii just like a normal program in ubuntu.  There should be a Expreii  icon on your desktop too, which is initially grayed out. To enable it, right click on it and choose 'Allow Launching' just like what is shown in the beginning of this video:

Within Feburary 2026, we confirmed that Expresii can run  on MacOS via Fusion, Android via Winlator, and Linux via WINE, thanks to the progress in emulation or VM technologies.  Recent improvement in OpenGL support allow us to run Expresii  on Android and Linux.   Today, you can run Windows on iPad via UTM but this doesn't get adequate OpenGL support to run Expresii.  UTM v.5.0.1  supports OpenGL 4.1 on MacOS. Hopefully, one day we will see UTM supporting OpenGL 3.0+ on iPad too and then you will be able to run Expresii on an iPad.

And, after these recent platform-related tests, I will be back to focus on getting Western watercolor in Expresii. Stay tuned.

I first tried Winlator 6.1 on a  on Snapdragon 730G  Android  phone   in mid-2024. Expresii ran, but any operation that heavily used OpenGL stalled the app to a halt.    Subsequently, I also tried later versions of Winlator   as they came out but still to no avail - it just crashed at startup with those later versions of Winlator.   

Recently I found that Expresii stopped working under VMWare Fusion since March 2024, and figured that it was an OpenGL  call with  GL_POLYGON_OFFSET_LINE at the app startup that crashed the app. I updated Expresii to not make such a call at startup, and now the latest version of Expresii works under   VMWare Fusion  AGAIN.

That reminded me of  the similar startup crashes with Winlator. So, I tried again their latest release 10.1 hotfix - Expresii ran, but just blank canvas when I stroke.   Then I found  they also hae a 11.0 beta pre-release - and a pleasant surprise - it  draws with ink simulation! See the video below:

Chip on the S24: Snapdragon 8 Gen 3, Adreno 750 GPU.
GPU detect by Expresii: zink (Turnip Adreno (TM) 750); GL 4.6 (Compatibility Profile) Mesa 22.2.5.

Yes, you need to choose Turnip (Adreno) as the Graphics Driver in Winlator for this to work - for those Samsung phone using   Adreno GPU.

Expresii works for the most part - simulation is correct.  No multi-touch gesture for pan and zoom - but you can use the GUI to switch to pan or zoom mode so that you can pan and zoom with just mouse interaction.   Loading of an artwork doesn't work and would crash the app. The Samsung S-pen on an S22 ultra also didn't work as stylus input to Expresii.

It only runs at 17 FPS at a screen size of 1280x720  and if I switch to 'Performance' mode for Box64 in Winlator, I can get up to 20 FPS.  

But this is all very encouraging - Winlator uses WINE and MESA.   So,  I thought Expresii could work under Linux  via WINE. And sure enough, a user just reported that it does work!   Now, if we can get graphics tablets to also work with WINE, then  you can really paint  with Expresii on Linux too. ^_^

Another Mac user asked about using Expresii on a Mac. So, I tried the latest version of VMWare Fusion. It became free even for commercial use since last time I tested it.    Expresii crashed last week. Took me a few days to figure that it's the MESA 24.1.0 OpenGL implementation of   GL_POLYGON_OFFSET_LINE crashing the app. Now at least  the latest version of Expresii runs but you still can't switch to Brush Display to 'Mid' or above, since those would use an outline shader, which relies on GL_POLYGON_OFFSET_LINE .

You will first need to resgister for a Broadcom account before you can download Fusion. When you install Windows on Fusion, you should use the "Get Windows from Microsoft" option within VMware Fusion because this way  some necessary drivers are already included:

There are many installation guides for VMWare Fusion on the internet so just follow them if you are not sure. For my test, I used Windows 11. Remember to install VMWare Tools too.

Yes, this time I don't need to use any third-arty software to use my drawing tablet WACOM Intuos Pro via USB. Just plug it to your Mac and  VMWare Fusion gives you a dialog asking if you would connect it to the Mac or the Virtual Machine (VM) running Windows.   See a video demo below:

I get  only 30-40 FPS on an M1 machine with 8GB. Too slow for smooth painting. Fusion suggested that I allocate to the VM up to 5.6GB out of the 8GB as recommended by Fusion and I did that.   Only 2 processor cores  allocated for the VM.  The VM uses a FullHD screen resolution.  Using a higher resolution would consume more rendering power. The M4 gives roughly double the performance of M1 so if you have an M4 Mac,  you should get a much smoother painting experience. For better performance, you should consider Parallels Desktop.