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This is not an answer (and therefore community wiki), but I'd like to point out that such an app is possible to write (I tried), but it's hard to not violate the terms of use.
If you don't do it right, you get a HTTP 429 error with the message "too many requests".
If you read about the policies, you can download tiles, but you'll find that
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This is old as hell but I do recommend a web-based solution.
https://xmllint.com
This code runs in your browser and does never send your data anywhere else. Everything remains local on your machine.
How do I know? I built it specifically for that purpose.
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