Looking for an accessible pomodoro timer app.

So far, I've found two fully accessible choices. I'll start with Pommie. It's a very simple app with a button for settings plus buttons to start, stop and skip stages of your timer. I remember paying for it but can't remember how much it was.
For a far more complex choice allowing for all kinds of productivity tracking and having other advanced options, check out an app called Focused Work. You can use a basic version for free, but need to pay a subscription to use more advanced features. It was made in Australia and that comes through in the notifications as well as in the information about the app.
Both of these apps allow for sound cues to indicate when the next stage is reached or the cession ends. Pommie has been more than enough to meet my needs, but it was years after I started using Focused work before I stumbled onto Pommie. I'm therefore able to recommend both apps having experienced their accessibility and quality first hand. Hopefully, one will suit your needs. Best of luck.