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This is a small python app with optional webUI. It is intended to be run locally. It can be run with Docker (cookie autodetection will not work).
It allows you to download a single substack, either entirely or partially, and saves the output to an epub file, which can be easily transferred to Kindle or other reading devices.
This is admittedly a "vibe coded" app made with Claude Code and a few hours of iterating, but I've already found it very useful for myself.
It supports both free and paywalled posts (if you are a paid subscriber to that creator).
You can order the entries in the epub by popularity, newest first, or oldest first, and also limit to a specific number of entries, if you don't want all of them.
You can either provide your substack.sid cookie manually, or you can have it be autodetected from most browsers/operating systems.
