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Substack vs ConvertKit: Newsletter-First vs Marketing-First

Comparisons

Substack and ConvertKit (now rebranded to Kit) serve newsletter creators, but they come from opposite ends of the spectrum. Substack was built as a publishing platform for writers. ConvertKit was built as an email marketing tool for creators. These origins shape every feature, every limitation, and every pricing decision.

Understanding which philosophy matches your needs prevents the frustration of outgrowing your platform or paying for capabilities you don’t use.

The Fundamental Difference

Substack thinks of your newsletter as a publication — like a magazine or newspaper. It provides a writing experience, a web presence, audience discovery, and built-in subscriptions.

ConvertKit thinks of your newsletter as a channel — one part of a broader creator business. It provides email delivery, landing pages, automations, and commerce tools.

If you’re primarily a writer, Substack’s model resonates. If you’re a creator with a newsletter as one component of a broader business, ConvertKit’s model makes more sense.

Pricing

Substack

  • Free to use (no monthly fees)
  • 10% revenue share on paid subscriptions plus Stripe processing (~3%)
  • All features available to everyone — no tiered limitations

ConvertKit

  • Free tier: up to 10,000 subscribers with limited features
  • Creator plan: $29/month (up to 1,000 subscribers), scaling with list size
  • Creator Pro: $59/month with advanced features, also scaling
  • 0% revenue share on paid content

The Math

At 5,000 free subscribers with no paid content, Substack costs $0 and ConvertKit costs $79/month.

At 5,000 subscribers with $5,000/month in subscription revenue, Substack costs ~$650/month (13% total fees) and ConvertKit costs $79/month.

ConvertKit becomes significantly cheaper at higher revenue levels. Substack is cheaper at lower revenue levels (especially $0).

Email Capabilities

Substack

  • Send when you publish a post (that’s it)
  • No automated sequences
  • No segmentation
  • No A/B testing
  • No conditional content
  • Basic email analytics (open rate, click rate)

ConvertKit

  • Automated email sequences (welcome series, courses, nurture campaigns)
  • Subscriber segmentation and tagging
  • A/B testing for subject lines
  • Conditional content based on subscriber attributes
  • Visual automation builder
  • Detailed email analytics with click maps
  • Broadcast scheduling

Winner: ConvertKit, overwhelmingly. If you need any email marketing functionality beyond “send this post to everyone,” ConvertKit is far more capable.

Audience Management

Substack

  • Subscribers are either free or paid
  • No tags, segments, or custom fields
  • Basic subscriber import/export
  • Free reader can become paid; paid can downgrade to free

ConvertKit

  • Tags, segments, and custom fields
  • Lead scoring
  • Subscriber preferences
  • Advanced filtering
  • Automation triggers based on subscriber behavior
  • Integration with CRMs and other tools

If you want to send different content to different segments of your audience, or build automated workflows based on subscriber actions, ConvertKit handles this natively.

Content Creation

Substack

  • Rich text editor designed for long-form writing
  • Web presence included (every post becomes a web page)
  • SEO-friendly pages on Substack’s domain
  • Support for images, embeds, code blocks, blockquotes
  • Footnotes and section breaks

ConvertKit

  • Email template builder (drag-and-drop blocks)
  • Focus on email formatting, not web publishing
  • Landing pages for lead capture
  • No native blog or web archive comparable to Substack

Substack treats your content as published work. ConvertKit treats your content as email marketing. The writing experience reflects this: Substack feels like writing an article; ConvertKit feels like building an email.

Monetization

Substack

  • Built-in paid subscriptions (monthly and annual)
  • Founding member tiers
  • Group subscriptions
  • All handled natively with Stripe

ConvertKit

  • Creator Commerce: sell digital products, paid newsletters, and subscriptions
  • Tip jars
  • Integration with external payment processors
  • No revenue share

Both platforms support paid newsletters, but Substack’s implementation is simpler and more deeply integrated. ConvertKit’s commerce features are broader (you can sell e-books, courses, and one-time products) but require more setup.

Audience Discovery

Substack

  • Recommendation network (other writers recommend you)
  • Notes (social feed)
  • Substack app
  • Search and leaderboards

ConvertKit

  • Creator Network (cross-recommendations between creators)
  • Otherwise, no built-in discovery

Substack’s network effects are stronger for audience discovery. ConvertKit’s Creator Network is growing but less developed.

Design and Branding

Substack

  • Limited customization (fonts, colors, logo)
  • Consistent look across all publications
  • No custom email templates

ConvertKit

  • Custom email templates
  • Custom landing pages
  • More branding control
  • Custom forms and signup embeds

ConvertKit gives you significantly more control over visual presentation, especially for emails and landing pages.

Integrations

Substack

  • Minimal third-party integrations
  • No API for external tools (yet)
  • No Zapier/Make.com integration
  • Limited to Substack’s ecosystem

ConvertKit

  • Extensive integrations (100+)
  • Zapier and Make.com compatible
  • API for custom integrations
  • Connects with WordPress, Shopify, Teachable, webinar platforms, and more

If your newsletter needs to connect with other tools in your business, ConvertKit is the only option.

Who Should Choose Substack

  • Writers whose primary output is long-form content
  • Writers starting from zero who need audience discovery
  • Writers who want simplicity over flexibility
  • Writers who don’t need email automations or segmentation
  • Writers who value a web presence alongside email delivery

Who Should Choose ConvertKit

  • Creators with a broader business (courses, products, coaching)
  • Writers who need email automations (welcome sequences, drip campaigns)
  • Writers who want to segment their audience
  • Writers at higher revenue levels where 10% revenue share is expensive
  • Writers who need integrations with other business tools
  • Writers who want full control over email design

Key Takeaways

  • Substack is a publishing platform; ConvertKit is an email marketing platform
  • Substack is free until you earn money; ConvertKit charges monthly based on subscriber count
  • ConvertKit’s email automation, segmentation, and integration capabilities far exceed Substack’s
  • Substack’s audience discovery network is more developed than ConvertKit’s
  • Substack includes a web presence; ConvertKit focuses on email delivery
  • Choose Substack if you’re a writer first; choose ConvertKit if you’re a creator with a newsletter
  • At higher revenue levels, ConvertKit’s flat fee beats Substack’s 10% revenue share