Accessibility is not only a necessity, but in certain cases a requirement - https://nda.ie/accessibility/european-accessibility-act
I am not fully sure if Caint requires following the EAA, but I would prefer to have Accessibility options available, not to comply with any laws⊠because we will eventually have users that would require them.
Now, as this is currently a 1-man-band, it may not be possible to implement everything right away, but it is something that can be worked on.
As noted previously, there are various different looks to Caint, that may be more suitable for certain users.
See https://caint.ie/topic/11/change-the-look-of-caint for more info.
AltText for uploaded images are already here.
Once the site is more established, and rules are going to be eventually drawn up, I will ensure that AltText becomes a requirement.
Whenever you upload an image, you will see the following text:

After the file extension (png) and before the closing bracket ()), you can add AltText, by typing "This is AltText"
So that it looks like this:

If there is anything else that should be adjusted to improve accessibility, please reply and let me know.