coughdrop VS rsyscall

You welcome friend. I know CoughDrop AAC work on Android and everywhere. Caregiver say it have 60 day free trial and $6 month or $200 1 time. coughdrop aac

As far as apps, I’ve been a fan of CoughDrop and have found it very accessible for lots of my EI families. If they don’t have a device at home, I use core communication board for well over half my caseload which you can create or download from lessonpix, or download from project core or PRC Saltillo (and im sure there’s many other free downloads as well)

You might also want to look at other apps that use the OpenBoardFormat: https://www.openboardformat.org/partners

I contribute to Optikey and was involved in OpenVoiceFactory in its first incarnation. Optikey is primarily QWERTY based but does supported the Communikate pagesets - more general OBF support would be a welcome PR! Coughdrop is probably a better fit for your needs, and is open source so free to self-host, though they do offer hosted plans for $.

https://github.com/CoughDrop/coughdrop

Can you say what left you confused?

I'm surprised, I thought https://github.com/catern/rsyscall is pretty self-contained and self-explanatory (if unclear on what exactly rsyscall is useful for), and I thought http://catern.com/integration.html is quite detailed (perhaps excessively so).

That's one of the things I use this kind of primitive for in https://github.com/catern/rsyscall