The creator economy split these platforms into different camps. Kit (formerly ConvertKit) built sophisticated automation for creators who already have audiences and want to sell courses, memberships, or products. Substack positioned itself as the publishing platform where writers build audiences organically.
We've deployed Kit for clients selling digital products and tested Substack for content-first strategies. The platforms serve fundamentally different business models, despite both handling email marketing.
Kit's automation sequences and segmentation tools target creators ready to optimize conversion funnels. Substack's discovery engine and publishing tools target writers building audiences from scratch. Most creators need to pick based on their current stage, not feature comparisons.
Here's what we learned testing both platforms across 20+ client deployments.
The short answer
Our verdict
Kit wins for monetization, Substack wins for audience building
Kit delivers superior automation and conversion tools for creators already monetizing their audiences. The visual automation builder, advanced segmentation, and integrated commerce features justify the higher cost when you're selling products or courses.
Substack wins for writers starting from zero who want to build audiences through content discovery. The publishing-first approach with built-in discovery, simple monetization, and zero upfront costs makes more sense for early-stage creators focused on growth over optimization.
How they actually differ
Kit operates as an email marketing platform that happens to include basic publishing tools. You import existing subscribers and build automation sequences to sell them products. The visual automation builder lets you create complex behavioral triggers and tag-based segmentation that Substack can't match.
Substack functions as a publishing platform that happens to include email delivery. You publish posts that automatically become newsletters, with Substack's algorithm potentially surfacing your content to new readers. The discovery engine can organically grow your audience without paid acquisition.
Revenue models differ fundamentally. Kit charges monthly platform fees but takes no cut of your sales — you keep 100% of product revenue minus payment processing. Substack takes 10% of all paid subscription revenue but charges no platform fees, making it essentially free until you monetize.
Integration ecosystems point in opposite directions. Kit connects with course platforms (Teachable, Thinkific), e-commerce tools (Shopify, WooCommerce), and marketing automation. Substack integrates primarily with writing and publishing tools, with limited third-party connections.
Pricing in 2026
Kit charges monthly platform fees based on subscriber count. The free tier covers up to 1,000 subscribers with basic features. Creator tier starts at $29/month for up to 1,000 subscribers, including automation sequences and integrations. Creator Pro at $59/month adds advanced reporting and priority support. Pricing scales with list size — expect $79/month for 2,500 subscribers or $149/month for 10,000 subscribers.
Substack operates on revenue sharing with no upfront platform fees. Free publishing includes unlimited subscribers, basic analytics, and simple paid subscriptions. Substack takes 10% of paid subscription revenue plus standard payment processing fees (approximately 3%). A $50/month paid newsletter generates $5 monthly fees to Substack, while a $5,000/month publication pays $500 monthly. Free newsletters cost nothing regardless of subscriber count.
Try Kit
Try Kit → What we’d actually deploy
For clients selling digital products or courses, we deploy Kit with Teachable or Thinkific integrations plus Zapier for advanced automation. The upfront platform costs pay off quickly when you're optimizing conversion funnels and maximizing customer lifetime value. We typically see 15-25% higher email conversion rates compared to basic platforms.
For content-first strategies focused on audience building, we recommend starting with Substack's free tier and potentially upgrading to Kit once monthly revenue hits $5,000+. Our Growth tier engagement includes Substack publication setup and content strategy, while our Scale tier covers Kit migration and advanced automation deployment when clients are ready to optimize for revenue per subscriber.
Frequently asked questions
Answered by The Editor, with notes from Atlas and Roxy.
Can you migrate subscribers from Substack to Kit?
Yes, but with limitations. Substack allows CSV export of email addresses but you lose subscriber engagement history and behavioral data. You'll need to rebuild tags and segments from scratch in Kit.
Which platform has better email deliverability?
Kit has stronger deliverability due to longer industry presence and established sender reputation. Substack's deliverability is good but newer, and the shared domain structure can occasionally impact inbox placement for individual publications.
Does Kit have content discovery like Substack?
No, Kit focuses purely on email marketing without content discovery features. You need to drive traffic to Kit landing pages through your own marketing efforts, social media, or paid advertising.
Can you use both platforms together?
Technically yes, but it creates subscriber confusion and deliverability issues. Most creators should pick one platform and commit fully rather than splitting their audience across both systems.
Which is better for selling online courses?
Kit integrates much better with course platforms like Teachable, Thinkific, and Kajabi. The automation sequences can trigger based on course progress and purchase behavior, while Substack has limited e-learning integrations.
How much does it cost to switch platforms?
Platform migration typically takes 2-4 weeks including data export, list cleaning, and automation rebuild. Budget 10-20 hours of setup time, plus potential subscriber churn of 5-15% during the transition period.
