Kit vs Substack 2026: Newsletter Fees Compared

Kit's Free plan supports up to 10,000 email subscribers, while Substack says publishing is free regardless of subscriber count. For paid subscriptions, Kit lists a USD commerce fee of 3.5% plus $0.30 per transaction; Substack lists a 10% platform fee plus Stripe charges. Compare the publishing and automation workflow as well as the fee.

We checked Kit's Free-plan guide, Kit Commerce fees and Substack's cost guide on October 30, 2026. Prices, eligibility, payment methods, taxes and plan terms can change. Confirm the current terms for your account and country.

Kit Commerce supports digital products and paid newsletters, subject to country and payment eligibility. Substack's fees vary with payment method and the creator's Stripe account. The table is not a complete comparison of features or a promise that the same readers will subscribe on either platform.

Toolradar data: The directory we run counted 108 products in its broad email-marketing snapshot, dated October 25, 2026. ActiveCampaign appeared as an alternative on 90 product listings. This describes directory relationships across email-marketing tools, not newsletter platforms tested or subscriber growth achieved.

A 100-paying-reader example

Assume 100 readers each make one $10 recurring payment on the web in a month: $1,000 gross revenue. Assume USD payments, a US Stripe account and US card processing at the rates in the cited Substack guide. Exclude tax, refunds, disputes, currency conversion, app-store purchases and any other charges.

For Kit, 3.5% of $1,000 is $35, and 100 transaction fees of $0.30 total $30. The listed Commerce fee would be $65, leaving $935 before the excluded items and any separate subscription charge that applies to the account. Kit's help says Commerce is available on every plan, including Free, and describes its USD fee as the cost of selling through Kit.

For Substack, 10% of $1,000 is $100. The cited guide's US-card processing example adds 2.9% of $1,000 ($29) plus 100 fixed transaction charges of 30 cents each ($30). Its listed Stripe Billing charge for recurring payments adds 0.7% of $1,000 ($7). The illustrative total is $166, leaving $834 before the excluded items.

The $101 difference is an arithmetic illustration, not a prediction of profit or a quote. The products may attract or retain different readers, and a paid Kit plan can add a subscription cost. Confirm which fees apply to your payment setup, currency, country and billing plan before making a financial decision.

What is free on each platform?

Kit's Free-plan help lists up to 10,000 email subscribers, unlimited forms, landing pages and broadcasts, tagging and segmentation, and digital products or subscriptions. It says creators need a paid plan for visual automations and email sequences. If an automated welcome or sales sequence is essential, price the appropriate paid plan for your list size rather than assuming the free tier covers it.

Substack's cost guide says publishing is free regardless of subscriber count. When paid subscriptions are enabled, its platform fee and Stripe charges apply to payments. Other optional or payment-specific costs can apply; for example, the guide lists an optional one-time custom-domain fee and notes that in-app purchases may be priced differently.

A free publishing plan and free payment processing are separate things. A newsletter with no paid transactions can have a different cost profile from one selling subscriptions or digital products. Identify the exact plan, transaction flow and region before projecting the bill.

Broadcasts, automation and publishing

Kit's Free guide describes unlimited broadcasts, forms and landing pages. It lists visual automations, sequences, rules and RSS campaigns as paid features. Its pricing page should be checked for the current paid tier and subscriber band. A creator who needs an automated onboarding sequence should include that plan cost in the comparison.

Substack's model centers on a publication and subscriber relationship. Before moving an existing newsletter, verify the specific publishing, email, segmentation and integration features you need in current documentation or a non-production trial. Do not assume a workflow built on one service maps one-to-one to the other.

Write a simple requirements list: how people subscribe, which message they receive first, whether emails depend on tags or events, who edits the publication and how paid access is granted or removed. Then test the desired workflow with a small, authorized audience. We did not create accounts or run a newsletter on either platform for this comparison.

Recommendations and audience growth

Kit's Free-plan guide describes its Creator Network and says users are enrolled when they sign up, with an option to turn it off. It distinguishes free recommendations from earning through paid recommendations, which it lists as requiring a paid plan. Check current eligibility and terms before relying on a recommendation channel.

Substack documents a recommendations feature that can display recommended publications and send occasional recommendation digests subject to its conditions. The vendor's recommendations guide describes the settings and reporting. A recommendation feature is a distribution mechanism, not a guarantee of subscribers or paid conversion.

Measure growth in a way that matches the decision: new subscribers by source, confirmation rate, opens or clicks where meaningful, paid conversion and cancellations. Review consent and privacy obligations before importing or sharing subscriber information. Platform-provided attribution can differ from other analytics, so document definitions before comparing figures.

Data export and migration

Substack's export guide describes downloading a subscriber CSV with all or selected columns. It says full subscriber names cannot currently be exported in that file. Verify which fields, subscription states and consent records are available before planning a migration.

For Kit, check the current export and import documentation and the fields available for your account. Ask how tags, segments, unsubscribes, paid status and consent records are represented, and whether paid subscriptions can be transferred without asking readers to subscribe again. Do not assume a CSV alone transfers billing relationships, automations or historical engagement.

Run a small migration test with authorized data. Compare counts, a sample of fields and unsubscribe handling; keep access to the original system until the new workflow is verified. Follow applicable privacy rules and your organization's policies when moving subscriber information.

Payment, taxes and geography

Kit's Commerce help says it uses Stripe for payments and lists the countries where creators can sell through that product. It describes a USD fee of 3.5% plus $0.30 and different fixed components for some other currencies. Check current eligibility, payout currency, identity requirements and terms before planning a launch.

Substack's cost guide lists a 10% platform fee, US-card processing and Stripe Billing fees for recurring payments. It says local payment methods can carry different Stripe fees and that in-app purchases can have different reader pricing. The US-card example above does not apply to every payment method or country.

Taxes, refunds, disputes and conversion costs can affect net receipts. Ask the payment provider and a qualified tax adviser how those items apply to your business. The figures in this guide are general examples and do not replace account-specific statements or tax advice.

Which is a better fit?

Consider Kit when forms, tags and segmentation are central to the workflow and its free subscriber limit or paid automation tier fits your list. Model both the subscription and Commerce fees if you sell paid products. Consider Substack when its publication and subscriber workflow matches how you want to publish, and model its platform and payment fees for the expected mix of paying readers.

The fee calculation is only part of the decision. Compare the editor, audience relationship, automation needs, export fields, payment eligibility and support you actually require. If the newsletter depends on a feature neither cited source confirms, ask the provider or test that workflow before migrating.

For related choices, see Kit pricing, beehiiv pricing, beehiiv vs Kit, beehiiv vs Substack, Kit vs Mailchimp, Kit vs MailerLite, Mailchimp pricing, MailerLite pricing, email marketing pricing compared and how to grow an email list. Directory profiles for Kit and Substack provide context, not account-specific prices.

FAQ

Is Kit free for a newsletter?

Kit's Free-plan guide lists up to 10,000 email subscribers, unlimited broadcasts and forms. It says visual automations and email sequences require a paid plan. Check current account terms.

Does Substack charge to publish a free newsletter?

Substack says publishing is free regardless of subscriber count. Its platform and Stripe fees apply to paid subscription payments, and optional or payment-specific costs can apply.

How much does Kit charge on a paid newsletter sale?

Kit's Commerce help lists 3.5% plus $0.30 per USD transaction and says Commerce is available on Free and paid plans. Confirm the fee, country eligibility and payment terms for the account.

What does Substack take from a paid subscription?

Substack's cost guide lists a 10% platform fee plus Stripe processing. Its US example includes 2.9% plus $0.30 for a card payment and a 0.7% Stripe Billing fee for recurring payments. Terms vary by payment method and country.

Can I export my Substack subscribers?

Substack documents a CSV export with all or selected columns. Its guide says full subscriber names cannot currently be exported in that file. Check the fields and consent records needed for your migration.

Which platform earns more from 100 paid readers?

Under the specific $10-per-reader, US-card assumptions above, the example leaves $935 before excluded costs on Kit and $834 on Substack. This calculation does not predict subscriber numbers, retention, taxes or other costs.

Method

We reviewed Kit's Free-plan and Commerce help and Substack's cost, recommendations and export documentation on October 30, 2026. We calculated a 100-payment USD example using the stated assumptions and used Toolradar's October 25 email-marketing snapshot for directory context. We did not create accounts or independently test either service. Fees and features can change.

Cite this: MarketingShot, "Kit vs Substack 2026: Newsletter Fees Compared", fees checked October 30, 2026.

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