Fundamental difference.
Substack and Medium are both platforms that allow users to publish and distribute their written content. However, they differ in a few key ways:
1. Ownership
On Substack, writers own their own content and can monetize it directly through paid subscriptions or one-time payments. On Medium, writers do not own their content and cannot monetize it directly.
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2. Payment model
Substack allows writers to charge their readers directly through paid subscriptions or one-time payments. Medium, on the other hand, uses a "partner program" model where writers are paid based on the number of views their articles receive.

3. Audience
Substack is geared towards newsletters and targeted audiences, while Medium is a more general platform with a larger, less defined audience.

4. Features
Substack offers a number of features specifically designed for newsletters, such as the ability to schedule email campaigns and segment subscribers. Medium offers a wider range of features, including the ability to post videos and audio recordings, and the ability to participate in discussions with other readers.
“Subscribe” buttons (found in your editor under “Buttons'“) will make it easy for new readers to subscribe to your newsletter with one click.
Ultimate conclusion
Which platform is best for you will depend on your goals as a writer and the type of content you want to create.
(But trust us on the “subscribe” buttons!)
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