As other have said, you might think you need a tool but in reality you only need to call the score before every serving and be aware of the logic of the scoring system such as “even” points always go to the right side (0-15, 30-15, 40-0), “paired” points always go to the left (0-0, 15-15, 30-0, 40-15) do it enough times and it becomes automatic
However if you really need a tool, someone else posted an app that he/she developed
https://apps.apple.com/mx/app/padel-scoreboard-scorebot/id6754282617?l=en-GB
Apart from the Apple Watch requisite (this one uses a Bluetooth remote) seems like it does what you were asking for, be careful though, if you don’t know the scoring rules it could also give you a false sense of assurance on a bad score