This may be a narrow use case, but just throwing this out there.
I’d love it if, during or after I’ve finished a text in Readlang, I could export my marked up text as PDF to review it. When I mark up a physical novel, I like going back to the start and scanning the notes I made on the page to see how much I remember. Sometimes, I even read the same novel twice (maybe a year apart), and I like to see what words I didn’t know on the first pass that I know by heart now. It’s really encouraging.
I know I can go back to the beginning of the file on Readlang once I’ve reached the end, but it takes a lot of clicking to scan through an 80,000-word novel, or even a 2,000-word article. Scrolling through a PDF would be much faster, and would allow for adding new handwritten notes or highlights.
Again, this might be a niche request, but being able to export marked up texts as PDF for further study would be an amazing help. I still pick up my annotated paperbacks around the house to refresh my memory, and would love to be able to easily do the same with the digital versions I’m annotating in Readlang.