Substack

Where Substack actually fits

The case for Substack is genuine for one specific archetype: a writer who has never published a newsletter, wants to start, and would rather not learn anything about email tools. Substack removes every decision: domain (default), template (chosen), payments (Stripe handled), audience (built into the Reader). You write, you send, you have a newsletter.

For that first 6 to 12 months of "do I even want to do this", Substack is the path of least resistance. The friction tax of choosing Beehiiv or Kit upfront is real, and most newsletters die before they ever launch.

What Substack costs

The marketing says "free". The reality is 10% of paid subscription revenue, plus Stripe fees on top. If you charge $5/mo for paid subs and have 100 paid subscribers, that is $500/mo in revenue. Substack takes $50/mo. Forever. As your paid list grows, that 10% becomes a real number.

For comparison:

• Beehiiv has a flat platform fee at higher tiers, no revenue cut.
• Kit has a flat monthly fee based on subscriber count, no revenue cut.
• Self-hosted (Buttondown, Postmark) is a flat monthly fee, no revenue cut.

A Substack with $5,000/mo in paid revenue is paying $500/mo in platform fees. Beehiiv at the same scale is paying ~$50/mo. The math compounds.

What you give up

• Tags and segments. Substack has no tagging or segmentation. Every email goes to the entire list.
• Automations. No drip sequences, no "subscribers who join after date X get a welcome series".
• Customisation. Substacks all look like Substacks. The branding is theirs more than yours.
• Domain ownership. You can use a custom domain on Substack but most people do not, and even with it, the platform branding leaks through.

When to migrate off

If your newsletter survives the first year and you start charging for paid subscriptions, the 10% cut becomes a real cost. The migration to Beehiiv or Kit is straightforward (Substack does export your subscriber list). Plan for the migration around the point your monthly platform fees pay back the time investment.

When Substack still wins

• You are starting a newsletter today and have never run one.
• You will not charge for paid subscriptions (the 10% cut does not apply).
• You want to be discovered by readers of similar Substacks (the Reader network is real).
• Your writing is the entire product and customisation is a distraction.

Verdict

Excellent for the first 6 to 12 months. Pricey at any meaningful paid scale. Most successful newsletters eventually graduate to Beehiiv or Kit, which is fine: Substack will have done its job by then.