Email platform for a publisher growing a free newsletter with sponsors

My pick: beehiiv. It’s a strong fit if you’re growing a free, publisher-style newsletter and want sponsorships to be part of the setup.

• Start free: Launch supports up to 2,500 subscribers. The current pricing page lists the Ad Network on Scale, currently $43/month when billed annually. (beehiiv.com)
• Find sponsors without building a sales operation: beehiiv surfaces ad offers you can choose to run, and handles campaign tracking, reporting, and payouts. Offers and earnings aren’t guaranteed; they depend on audience fit and performance. (beehiiv.com)
• Keep direct deals too: Its Ad Network is non-exclusive, so you can also sell sponsorships yourself. (beehiiv.com)
• Grow the list: It includes free newsletter recommendations on all plans. (beehiiv.com)

One caveat: the built-in Ad Network requires a paid plan and sending through beehiiv. If you already have direct sponsor relationships or an ad-sales team, compare it against a more customizable email platform—the network is most useful for filling available ad slots and reducing sponsor-management work. (beehiiv.com)

Short answer: For a free newsletter that will carry sponsors, beehiiv is the strongest default. Kit is the cheapest option if you don't need a built-in ad network, and Ghost suits you if you want to own a website and newsletter together. Pricing changes often, so confirm current numbers before you commit.

Platform options

• beehiiv (best fit for sponsor revenue). It offers a referral program that rewards readers for inviting friends, a "Boosts" network where you can pay to get your newsletter recommended inside other Beehiiv publications, plus built-in monetization. Its free tier covers up to 2,500 subscribers. The ad network is the key feature for you: the Ad Network and Boosts are on the Scale plan, which lists at roughly $43/month billed annually, and Max is $96/month billed annually. Sources disagree on exact tier pricing, so check the live pricing page.
• Kit (formerly ConvertKit). It is the best free option at scale, since Kit goes furthest at no cost (to 10,000 subscribers). However, it has modest monetization compared to Beehiiv, and one comparison says it has no built-in ad network. It makes sense if your sponsorships are handled directly rather than through a network.
• Ghost. It fits if you want a site, newsletter, and memberships in one place. It charges a flat fee starting at $18/month with no revenue share. Note that a sponsor ad network isn't built in, so you'd rely on direct deals or a marketplace.
• Substack. It is free to publish, but it has no real sponsorship tooling. Its ad feature is pilot only, and it's built for reader subscriptions rather than sponsors.

Finding and managing sponsors (separate from the email sender)

• Paved: a marketplace and ad network. It takes 20% on marketplace deals and pays NET-30 after the sponsored send, but Paved's bookings need 50,000 subscribers.
• Hecto: free to list, with a lower take. It takes 5% of each booking plus Stripe charges, and it has no subscriber minimum.
• Sponsorships.ai: a flat-membership marketplace for newsletters, podcasts, YouTube and events, with 0% commission.
• Sponsy: sponsor-slot management software rather than a marketplace. It is free with $5 per booked slot after the first 5, Pro from $49 a month.
• Wellput: a performance-based network, but it takes US newsletters with 20,000+ subscribers.

Recommended setup

1. Start on beehiiv's free tier while you're under 2,500 subscribers, and test the platform's referral and growth tools.
2. Once you're near the limit, move to a paid plan so you can use the ad network.
3. Add Hecto or Sponsorships.ai if you want inbound marketplace demand, and use Sponsy once you're juggling several sponsors.
4. If you prefer owning your site, Ghost plus direct sponsor deals is a credible alternative.

If you tell me your current subscriber count, send frequency, and whether you plan to sell paid subscriptions, I can narrow this down and run the cost math.

For a publisher focused on growing a free newsletter and monetizing via sponsorships, the industry consensus for 2026 points toward Beehiiv as the strongest "all-in-one" operating system.

However, the "best" choice depends on whether your priority is aggressive growth, simplicity, or advanced marketing automation.

1. The Top Recommendation: Beehiiv

Beehiiv is widely considered the best choice for publishers who view their newsletter as a business.

• Why it works for sponsors: It includes a native Ad Network that allows you to easily find and insert sponsorships into your newsletter. It removes the "spreadsheet headache" by handling much of the booking and payment process.
• Growth Focus: It is built for scale. It features built-in referral programs, a "Boosts" network (where you can pay to acquire subscribers or get paid to recommend others), and SEO-optimized archive pages that help your content get discovered.
• Best For: Publishers who want to treat their newsletter as a standalone media brand and want monetization and growth tools integrated into one dashboard.

2. The Alternative: Kit (formerly ConvertKit)

If your business is more complex—for example, if you sell digital products, courses, or memberships alongside your sponsorships—Kit is often the superior choice.

• Why it works: It offers industry-leading automation and segmentation. If you want to send different sponsorship pitches or content based on subscriber behavior, Kit’s "visual automations" are far more powerful than Beehiiv’s.
• Best For: Creators who need a robust CRM and marketing funnel to sell products beyond just newsletter sponsorships.

3. The Minimalist Option: Substack

Substack remains the easiest, lowest-friction platform for writers who want to focus entirely on content.

• Why it works: It is completely free to start and provides a massive built-in discovery network.
• The Trade-off: It lacks the advanced sponsorship management tools of Beehiiv. You will likely need to manage sponsor outreach, contracts, and tracking manually. Additionally, if you pivot to paid subscriptions, they take a 10% cut.
• Best For: Writers who want zero technical setup and are comfortable handling their own sponsorship manual labor.

Comparison Summary

Recommendation for Your Next Step

1. If you are just starting: Start with Beehiiv's free tier. Its growth tools (referrals and recommendations) are significantly more effective at the early stage than what you will find elsewhere.
2. Evaluate your admin time: If you find yourself spending more than 2–3 hours a week on sponsorship emails, scheduling, and tracking, look into a dedicated management tool like Paved or Sponsy to layer on top of your email platform.
3. Ownership: Whichever platform you choose, ensure it allows you to export your subscriber list at any time. Never build your audience on a platform that locks you into their ecosystem.

For a publisher growing a free newsletter with sponsor revenue, beehiiv is the strongest default—especially if you want to start with automated ad offers and later manage direct sponsor deals.

• Start free: beehiiv’s free tier supports up to 2,500 subscribers. Its ad network requires a paid plan, so you can build your list before paying to access that monetization channel. ¹²³
• Monetize as you grow: On a paid plan, beehiiv offers performance-based ad campaigns; its Pro/Enterprise plans also include direct sponsorship tools for scheduling placements and tracking performance. ³⁶¹⁰
• Tradeoff: The ad network is tied to newsletters sent through beehiiv, and offers depend on advertiser availability. ³⁶

Consider Kit instead if you value creator-style email marketing and want a sponsor-matching service built into your platform. Kit lets you approve ads and pays based on clicks, but its help documentation says access to sponsorship campaigns requires a paid plan and that the service takes a 23.5% fee from ad revenue. ⁵

Bottom line: Choose beehiiv if sponsorships are central to the publication and you want a path from automated ads to direct sales. Choose Kit if its email-marketing features fit your workflow better and you’re comfortable with the ad-revenue fee. Compare current plan details before committing, since pricing and eligibility can change. ²⁵