Substack’s 10% revenue share generates passionate opinions. Publishers either love the simplicity or resent the ongoing cut. Beehiiv’s flat-fee model attracts converts, while ConvertKit sits somewhere in between. The choice matters more as newsletter revenue scales.

Substack: The 10% Question

Substack takes 10% of subscription revenue plus payment processing fees (roughly 2.9% + $0.30 per transaction). For a newsletter generating $5,000 monthly, that’s $500 to Substack plus another $170ish in payment fees. Total cost: $670 monthly, or about 13.4% of revenue.

The appeal is obvious at the start. Zero upfront cost. No technical complexity. Write, publish, collect money. For creators testing whether anyone will pay for their work, the risk-free model makes sense. Launch today, cancel anytime if it doesn’t work.

The friction appears at scale. A newsletter generating $50,000 monthly pays Substack $5,000 plus payment fees. That’s $65,000 annually to a platform you don’t control. At that scale, the calculation changes. You’re no longer a small creator grateful for infrastructure. You’re funding Substack’s business model.

Substack argues the 10% includes discovery features, recommendation algorithms, and the network effect of the platform. In practice, most newsletter growth comes from the creator’s existing audience and promotional efforts, not Substack’s directory.

Beehiiv: Predictable Costs, More Complexity

Beehiiv charges flat monthly fees based on subscriber count. The scale plan costs $99 monthly for up to 10,000 subscribers, then increases at higher tiers. Payment processing is separate at standard rates.

A newsletter with 5,000 paying subscribers at $10 monthly generates $50,000 in revenue. Beehiiv’s cost is $99 monthly plus processing fees (around $1,700), totaling roughly $1,800 or 3.6% of revenue. The savings versus Substack are substantial.

The tradeoff is control versus simplicity. Beehiiv gives you more features, better analytics, and options Substack doesn’t offer. But you’ll spend time configuring things that just work out of the box on Substack. There’s an argument that creators should focus on creating, not managing platforms.

The referral program is Beehiiv’s standout feature. You can incentivize readers to share your newsletter with structured reward tiers. This works brilliantly for some publications and barely moves the needle for others. It’s worth the flat fee for publishers who execute referral strategies well.

ConvertKit: Email Marketing First, Publishing Second

ConvertKit approaches newsletters as email marketing rather than publishing. The pricing scales with subscriber count: $66 monthly for 5,000 subscribers, $208 for 20,000. Payment processing for subscriptions costs extra through Commerce, their paid product offering.

Where ConvertKit shines is automation and segmentation. You can build sophisticated email sequences, tag subscribers based on behavior, and create multiple funnels. This matters if your newsletter is part of a broader business selling courses, consulting, or products.

For pure editorial newsletters, ConvertKit is probably overbuilt. You’re paying for features most publishers don’t need. The interface reflects its email marketing heritage, which feels less intuitive than platforms designed for writers.

The Hidden Costs Nobody Mentions

Platform fees are visible. The hidden costs are time and opportunity. Substack’s simplicity means you’re writing instead of troubleshooting SMTP settings. That has value, even if it’s hard to quantify.

Beehiiv and ConvertKit require more setup and maintenance. If you enjoy tinkering with tools, that’s fine. If you’d rather spend that time writing or promoting, the 10% might be worth it. The question isn’t which platform costs less, it’s which cost structure fits your model.

Migration is the other hidden cost. Switching platforms means exporting subscribers, updating payment processing, redirecting old links, and communicating changes. It’s messy and risks losing subscribers. Choosing wisely upfront matters more than optimizing costs later.

What Makes Sense When

Starting out? Substack’s risk-free model is hard to beat. Launch quickly, test whether people will pay, worry about costs when they’re meaningful. If your newsletter doesn’t work, 10% of zero is zero.

Established newsletter with predictable revenue? Beehiiv’s flat fees save money at scale. The break-even point is roughly 1,000 paying subscribers at $10 monthly. Above that, the savings compound quickly. Below that, Substack’s simplicity might be worth the premium.

Newsletter as part of a business? ConvertKit makes sense if you need sophisticated automation. The higher costs are justified if you’re driving readers to paid products or services beyond the newsletter itself.

The platform decision matters less than the content and promotion strategy. A great newsletter succeeds on any platform. A mediocre newsletter fails on all of them. Don’t overthink the tools at the expense of the work.