Hi Liamlumber10
welcome to the Apple (user-to-user) Community.
Sorry I don't personally know of any apps that may suit your needs.
If you have a specialist helping you with dyslexia, they may be able to suggest apps that suit your needs.
Else:
If you wish: Try opening the App Store on your iPad, and putting "dyslexia" in the search bar.
Any apps that have a "GET" button are free apps.
You can find out more about any app by clicking on it's picture.
(Eg: There's often a review or two from those who use, or have tried, the app.
Note: Some apps are free to download, but may require in-app purchases in order to use all the features.)
If you decide to try an app: You can click an app's "GET" button to download it.
Eg: I tried searching for dyslexia the App Store on my Mac, and quite a few apps appeared.
Several appeared to be useful, although some seem to be created for other purposes, like speed-reading.
Also: If needed: you can:
Change color on iPad to make it easier to see items onscreen - Apple Support
All the best :-)