Substack
Also known as: Substack newsletter, paid newsletter, Substack Notes, independent journalism platform
Substack is a platform for publishing newsletters and podcasts directly to email subscribers, with built-in paid subscription features.
Writers publish content to free and/or paid tiers -- Substack takes 10% of subscription revenue, leaving writers with 90%. This model attracted thousands of journalists, essayists, writers, and subject-matter experts who left traditional media for independent publishing. Notable Substack writers have earned millions in annual subscription revenue. Substack has approximately 35 million active subscriptions (across free and paid newsletters). The platform expanded beyond email to include a social 'Notes' feature (similar to Twitter), podcasts, and chat functions.
Substack, explained at three levels
At home
Substack is a platform where writers publish newsletters that go directly to your email. Some newsletters are free; others require a paid subscription (typically $5-10/month or $50-100/year). You subscribe to writers whose work you value -- it is like a magazine subscription but the writer gets most of the money directly. You read the newsletter in your email inbox or on the Substack website. Unlike social media algorithms, newsletters from writers you subscribe to always reach you directly, without a feed or algorithm deciding whether to show them.
At work
Substack is used by professionals to publish newsletters that showcase expertise, build an audience, and potentially earn direct subscription revenue. A consultant who publishes a weekly newsletter analyzing their industry can build a subscriber list that becomes a business development tool -- subscribers become clients or refer clients. A journalist who writes on Substack maintains a direct audience relationship independent of any employer. The paid subscription model rewards consistent, valuable content rather than viral engagement.
At home
Substack's economics are distinctive: the platform takes 10% of paid subscription revenue (plus Stripe payment processing fees, approximately 2.9% + $0.30 per transaction). This means a writer with 1,000 subscribers paying $5/month earns approximately $4,500/month after Substack's cut -- economics impossible to achieve writing for most traditional publications. The model rewards writers who build and retain direct subscriber relationships, making email list growth the primary focus rather than social media virality. Free subscriber conversion to paid subscribers is the key metric for monetized newsletters.
At work
Newsletter publishing platforms comparison: Substack (simplest, lowest friction, built-in discovery, 10% revenue cut); Beehiiv (newsletter + website, monetization features, lower % fee); ConvertKit/Kit (email marketing plus creator commerce); Ghost (self-hosted option, no revenue cut, requires more technical setup). The choice depends on the writer's technical comfort, monetization strategy, and whether they want Substack's built-in discovery network (Substack recommends newsletters within the app) vs. independent audience building. Many professional newsletter publishers choose platforms with lower revenue cuts once they have significant subscriber revenue.
At home
Substack's 'Notes' feature (Twitter-like short posts within the Substack app) represents a bid to become a broader social platform rather than just a newsletter delivery mechanism. The strategic intent is to give Substack readers a reason to be in the Substack app rather than just email inboxes, and to give writers a social distribution channel within Substack's ecosystem. This positions Substack as a competitor to X (Twitter) and LinkedIn for professional commentary -- a significant strategic expansion from newsletter infrastructure.
At work
Substack's content moderation philosophy -- protecting writers' editorial freedom over enforcement of content rules -- has created tension: the platform's most valuable writers tend to be opinionated, which attracts both loyal subscribers and controversy. When high-profile Substack newsletters publish content that migrates toward extremism, Substack faces pressure to moderate that other platforms resolve by removing content. Substack's responses have been to make content moderation minimal -- a competitive strategy (attracting writers worried about 'deplatforming') that carries reputational risk with advertisers and some subscriber segments. This philosophy distinguishes Substack from competitors that take more active moderation approaches.
Real-world examples
At home
Lena was a senior marketing consultant who had been considering starting a newsletter for years. She started a free Substack on trends in digital marketing, publishing every two weeks. After six months and 800 free subscribers, she added a paid tier ($8/month) with exclusive analysis and templates. Eighty subscribers converted to paid in the first month. The newsletter became a client acquisition channel -- three consulting engagements came directly from newsletter subscribers over the following year.
At work
Jerome worked for a financial services company that wanted to build thought leadership. Instead of relying on LinkedIn posts with limited reach, they launched a Substack newsletter analyzing fintech trends. Free subscribers received weekly analysis; paid subscribers received a monthly deep-dive and access to a private community. The newsletter built a direct audience of 12,000 free subscribers and 400 paid subscribers within 18 months, generating direct revenue and positioning the company's analysts as leading voices in the sector.
Common confusions
- Many potential newsletter publishers assume you need an existing large audience to succeed on Substack — Many successful Substack newsletters were started by writers with small existing audiences who grew their subscriber base through consistent quality, cross-promotion with other Substack writers (Substack's recommendation network), and converting email lists from other sources. The direct email relationship (rather than algorithm-mediated social reach) means engagement rates on newsletters are often 30-50% open rates -- much higher than equivalent social media organic reach. Growth is slower than viral social media but the subscriber relationships are more durable.
- Some assume Substack's 10% fee is too high and there is no advantage over starting your own email newsletter tool — Substack's 10% fee is expensive relative to dedicated email platforms for large subscriber lists, but Substack provides discovery infrastructure (newsletter recommendations within the Substack ecosystem), simplified paid subscription management, and brand credibility from the platform's association with professional journalism. For writers starting out, Substack's zero-upfront-cost model (you pay only when you earn) and discovery features can justify the higher long-term percentage. Writers with very large paid subscriber lists typically migrate to lower-percentage alternatives.
For analysts
When clients want to build thought leadership and direct audience relationships, a newsletter strategy on Substack (or similar platforms) is often underutilized relative to social media. The key differentiation: newsletter subscribers have opted in specifically to that writer's perspective, creating higher-quality relationships than social media followers. The recommendation is to start a free Substack with a clear topic focus and consistent publishing schedule, targeting free subscriber growth before considering paid tiers. Newsletter success requires 6-18 months of consistent effort -- it is a long-game investment appropriate for organizations with established expert voices and patience for compounding growth.
History & origin
Chris Best, Hamish McKenzie, and Jairaj Sethi founded Substack in 2017. Early growth was modest, but a surge of high-profile journalists leaving traditional media for Substack starting around 2020 (Matt Taibbi, Glenn Greenwald, Andrew Sullivan, Bari Weiss among others) gave the platform mainstream media attention and validated the model. The 'Substack moment' coincided with journalists reassessing employment at newspapers after layoffs, editorial constraints, and reduced income. Substack's approach -- writers keep 90% of subscription revenue -- was significantly better economics than traditional media for writers with established audiences. The platform raised $65M in 2021 at a $650M valuation. Competition emerged from ConvertKit (now Kit), Beehiiv, and Ghost as newsletter infrastructure alternatives. Substack's 'Notes' feature (Twitter-like short-form posts, launched 2023) expanded its identity beyond pure newsletters. Controversy arose when some high-profile Substack newsletters published content critics characterized as promoting extremism -- highlighting Substack's 'don't moderate content' philosophy as a competitive differentiator that also became a reputational risk.