Is Substack free to use?

Publishing on Substack is free to start — there’s no upfront fee. If you charge for paid subscriptions, Substack takes a percentage of that revenue plus payment processing costs. Free newsletters with no paid tier can run at no platform cost to the writer.

How is Substack different from social media?

On social platforms, an algorithm decides who sees your content and the audience belongs to the platform. On Substack, posts go directly to subscribers’ inboxes and the email list belongs to the creator. Many creators use social media for discovery and Substack for the durable, direct relationship.

Can brands use Substack?

Yes — brands and companies use Substack as a content-marketing and thought-leadership channel, building a direct newsletter relationship with their audience. As with creators, a consistent cadence and a focused niche tend to matter more than volume for growing engaged subscribers.

Glossary

Platforms

What is Substack? Definition & How It Works

Quick definition

Substack is a publishing platform that lets writers and creators send email newsletters and run paid subscriptions directly from their own audience.

Platforms

Substack, explained

Part of the SocialKit social media glossary — browse every term.

What Substack is

Substack is a publishing and subscription platform built around the email newsletter. Launched in the late 2010s, it lets writers, journalists, and creators publish posts that go out directly to subscribers’ inboxes and, optionally, charge for premium content through paid subscriptions. Substack takes a percentage of subscription revenue rather than charging upfront fees, aligning its model with the creator’s success. Over time it has expanded beyond text into podcasts, video, a discovery feed, a chat feature, and a mobile app, positioning itself less as a pure newsletter tool and more as a home base creators own directly.

How it shows up in the creator economy

Substack sits at the centre of the shift toward creator-owned audiences and away from renting reach on algorithmic social platforms. Its core appeal is the direct relationship: a writer’s email list belongs to them and isn’t subject to a feed algorithm deciding who sees each post. Many creators use social platforms — X, LinkedIn, Threads, Instagram — as top-of-funnel discovery, then convert followers into Substack subscribers where they can reach them reliably and, potentially, monetise. Substack’s own recommendation network and Notes feed add a social layer that helps writers discover each other’s work.

What it means for creators and brands

For creators, Substack’s draw is ownership and direct monetisation: an email list is a durable asset in a way that social followers, subject to platform changes, are not. The trade-off is that growth depends heavily on the creator’s own promotion, since there’s no large algorithm pushing content to new audiences the way a For You feed does. For brands, Substack can serve as a content-marketing and thought-leadership channel. Consistent publishing cadence and a clear niche tend to matter more than raw volume for building a loyal subscriber base.

Where SocialKit fits

Substack thrives on social-media discovery — SocialKit schedules the X, LinkedIn, Threads, and Instagram posts that funnel new readers to your newsletter, all from one calendar across 11 platforms.

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FAQ

Substack: common questions

Quick answers to the questions people ask most about this term.

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