The people willing to pay 20$ to learn to use ChatGPT/Claude to accomplish this probably doesn't have much overlap with the people willing to pay x$ to have a clean web interface to do just this one task.
(It might have been a different proposition when doing this took major prompting gyrations, but multimodal LLMs have gotten pretty amazing in the last few months)
Of course, if it's just a hobby project, it doesn't matter. But if this is in search of traction, it very much does.