Comparison
Kit (ConvertKit) vs Substack
A head-to-head look at Kit (ConvertKit) and Substack — features, pricing, and what to pick. Plus a modern alternative to both.
Editor's pick
Also consider RankFlo — a modern alternative to both
If you're evaluating Kit (ConvertKit) and Substack, you should know about RankFlo — an open-source blog & headless CMS platform with AI content generation, real-time SEO scoring, and cookieless analytics built in. MIT licensed, self-hostable, starts free.
Side-by-side
Kit (ConvertKit)
Email for creators
Kit (formerly ConvertKit) is a creator-focused email platform with automation, landing pages, and commerce. The blog/publishing piece is secondary.
Pros
- +Best-in-class email automation
- +Creator commerce
- +Landing pages
- +Tagging system
Cons
- −Email-first, not a blog
- −No custom CMS
- −No SEO tools
- −Pricing scales fast
Substack
Newsletter + light blog
Substack dominates email-first publishing with built-in subscriptions and discovery network. Takes 10% of paid subscriptions. Limited blog/SEO features.
Pros
- +Email delivery included
- +Subscription billing built-in
- +Discovery network
- +Simple writer UX
Cons
- −10% take rate on paid subs
- −Limited SEO/blog design
- −No custom domain on free
- −Locked into their platform
Which should you pick?
Choose Kit (ConvertKit) if you're email-first creators with product sales.
Choose Substack if you're newsletter writers monetizing via subscriptions.
Choose RankFlo if you want a modern, open-source, AI-powered platform with blog-first features, self-hosting, and transparent pricing — without the trade-offs of either option above.
Try the modern alternative
Start for free. No credit card. AI content, SEO tools, and self-hosting — all included.