I work on a lot of photography sites where adding unique Alt Text is a major hassle.

AltText.AI has a simple WordPress plugin that works very effectively on single or bulk images. The output is excellent - describing the images accurately and in detail (not just a couple of keywords).

It also updates titles, captions as well as Alt Text if required.

If you're interested in SEO and want to easily tick off adding Alt Tags as a task, then this software is a no-brainer.

Only wish I could stack more than 3 codes for more credits - although you can buy additional credit packs if you need more than your allowance which is good to know.