Three tools for sending a newsletter, all wildly different in what they actually optimise for. One is a full email-marketing platform, one is a creator-first newsletter business, one is a publishing tool with its own discovery engine. Picking the wrong shape wastes months.
AIStackFit earns no commission on this article at time of writing. We haven't joined affiliate programmes for any of the three yet — so this is pure editorial. See our methodology for how we make picks.
Pick Mailchimp if your newsletter is one part of a broader marketing operation — you run automations tied to your website, need segmentation, want deep integrations with the rest of your SaaS stack, and treat email as a channel for a business that isn't the newsletter itself. Pick Beehiiv if your newsletter is the business, or is heading that way — paid subscriptions with better economics than Substack, real analytics, growth features, ownership of your list. Pick Substack if you're a writer who wants the absolute lowest friction to publish and grow, and you're comfortable being part of the Substack discovery ecosystem. For most SMEs starting a business newsletter today, the choice is really Mailchimp (if newsletter supports a broader business) versus Beehiiv (if the newsletter is the growth engine). Substack is best for pure content creators.
Before comparing, let's be precise. Small business newsletters in 2026 fall into three shapes that map roughly to the three products. Shape 1: newsletter as customer-marketing channel — a business that already has customers sending them updates, product news, promotions, tied to segmentation and automation. Shape 2: newsletter as audience-building engine — a business growing an audience of prospects who will eventually buy something else (a service, a product, a course). Shape 3: newsletter as the business — paid subscribers whose subscription revenue is a meaningful line item.
Mailchimp is built for Shape 1. Beehiiv is built for Shape 2 (with Shape 3 as an upgrade). Substack is built for Shape 3 with lots of Shape 2 users. Picking the wrong tool for your actual shape is the single biggest mistake SMEs make in this category — it usually shows up as "I can't do X" pain three months in when your newsletter has grown into a shape the tool wasn't designed for.
Skip the feature checklists. Five dimensions decide this for an SME:
Let's go through each.
This is the dimension where the differences become financially real, and where Beehiiv earns its position.
Mailchimp Standard starts at $20/month for 500 contacts and scales sharply: 5,000 contacts is roughly $75/month, 10,000 is ~$110/month, 25,000 is ~$285/month. The pricing includes segmentation, automations, A/B testing, and Mailchimp's broader marketing tools. If you use those tools, the price is justifiable. If you just want to send a newsletter to 25,000 people, you're paying for capability you don't use.
Beehiiv Launch is free up to 2,500 subscribers with limited features. Beehiiv Scale is $79/month for up to 10,000 subscribers with full features (paid subscriptions, better analytics, growth tools). Beehiiv Max at $119/month covers 25,000 subscribers. The pricing curve is flatter than Mailchimp's above 5k subscribers, which becomes material as you grow.
Substack charges no monthly fee. Instead they take 10% of paid subscription revenue plus Stripe's payment processing (~2.9% + 30c). For free-only newsletters, Substack is free forever. For paid newsletters, the maths flips: $10,000/year subscription revenue = $1,000/year Substack fees, whereas Beehiiv Scale at 10k subs is $948/year flat plus Stripe fees. Above ~$2,000/month in paid subscription revenue, Beehiiv is cheaper. Below that, Substack wins on economics.
How quickly you can go from "I have an idea" to "sent" matters more than most people admit.
Substack has the fastest publishing loop in the category. Open the composer, write, hit send. Almost no formatting decisions, no template selection, minimal fiddly setup. For writers who publish frequently, this speed advantage compounds — less friction per issue means more issues written.
Beehiiv is close to Substack on speed but offers more polish. Block-based editor with more layout options, header images, embeds, custom widgets. The tradeoff: slightly more decisions per issue, but visibly better-looking output that lands more professionally for business audiences.
Mailchimp is materially slower because it's a full marketing platform. Template selection, block editing, list selection, segmentation, testing setup — each issue involves more steps. For a marketing team producing monthly newsletters with tight brand control, the extra steps are worth it. For a founder who wants to write and send weekly, Mailchimp's overhead is genuine friction.
This is the dimension people underestimate when picking a newsletter tool.
Substack has a genuine discovery engine: the Substack app surfaces newsletters to readers who follow related writers, Notes (Substack's Twitter-like feed) drives cross-writer traffic, and the "Recommended by" feature lets Substack writers actively cross-promote each other. For creators building an audience from scratch, this network effect is real and materially valuable. It's the single strongest reason to pick Substack over Beehiiv.
Beehiiv has the Boost marketplace (paid recommendations from other Beehiiv publishers, running $2-5 per subscriber typically), robust referral programmes (subscribers can refer friends for rewards you configure), and better landing-page tooling for converting web traffic. Growth here is more purchased and more designed than Substack's organic-feeling network effect, but it works reliably for businesses willing to invest.
Mailchimp assumes you're bringing your own list. It has basic signup forms and integration with your website but no meaningful discovery or referral tools built in. For a marketing team supporting an existing customer base, this is fine. For starting from zero, Mailchimp offers the least help.
If you want to charge for your newsletter, the choice narrows quickly.
Substack has the smoothest monetisation UX in the category: turn on paid subs in settings, connect Stripe, done. Substack takes 10% of subscription revenue. For newsletters with under ~$2,000/month in paid subscriptions, Substack's take is less than Beehiiv's flat monthly cost, so Substack wins economically.
Beehiiv supports paid subscriptions with better economics above scale, plus ad networks, sponsorship management, and paid recommendations that give you multiple revenue paths beyond subscriptions. If your newsletter is a business with multiple revenue streams, Beehiiv is designed for that.
Mailchimp doesn't do newsletter subscription monetisation natively — you'd need to integrate a separate paywall tool or membership platform. If newsletter monetisation matters, Mailchimp is the wrong tool.
Emails landing in inboxes and being able to leave with your list are the two most important long-term concerns.
Deliverability is credible on all three in 2026. Mailchimp has the deepest sender-reputation infrastructure and the most tools for managing bounces, spam complaints, and re-engagement — critical for larger lists with mixed quality (imported contacts, purchased leads). Beehiiv's deliverability tools are strong and improving, with dedicated IPs available on higher tiers. Substack piggybacks on its own infrastructure with good results, but you have less control if issues arise.
List ownership is equivalent in principle — all three let you export your subscriber list at any time. The subtler difference: Substack's discovery engine creates soft lock-in (leaving Substack means losing that growth channel), whereas Beehiiv and Mailchimp are more platform-neutral.
| Dimension | Mailchimp | Beehiiv | Substack |
|---|---|---|---|
| Cost at 5k subs | ~$75/mo Standard | Free plan usable to 2.5k, then $79/mo | Free (or 10% of paid revenue) |
| Cost at 25k subs | ~$285/mo | ~$119/mo Max | Free if unpaid; 10% cut if paid |
| Publishing speed | Slower (heavy platform) | Fast | Fastest |
| Editor polish | Marketing-tool feel | Modern, blocks, embeds | Minimal, writer-focused |
| Discovery / growth | Assumes you bring your list | Boost marketplace, referrals | Substack app + cross-writer network |
| Monetisation | Not native | Paid subs + ads + sponsors | Paid subs, 10% take |
| Deliverability at scale | Deepest tooling | Strong, improving | Good, less control |
| Best for | Marketing operation | Newsletter-as-business | Writer / creator |
Mailchimp is the right answer when:
Beehiiv is the right answer when:
Substack is the right answer when:
Three concrete scenarios:
Scenario A — SME with 3,000 customers doing monthly product-update newsletter: Mailchimp Standard at ~$45/month. Right tool, right price. Beehiiv works too but you'd be paying for creator features you won't use.
Scenario B — Founder building a 10,000-subscriber weekly newsletter as audience for future SaaS launch: Beehiiv Scale at $79/month. Sub-$1,000/year for the growth engine of your business. Cheaper than Mailchimp at the same subscriber count, and materially better tooling for the growth job.
Scenario C — Writer with 5,000 subscribers, ~200 paying $8/month: Substack takes $160/month (10% of $1,600 paid subs revenue). Beehiiv Scale would be $79/month flat — you'd save $80/month by moving. That's the tipping point where Beehiiv economics justify the switch.
Four questions:
Most business-newsletter SMEs land on either Mailchimp (if newsletter supports the business) or Beehiiv (if newsletter is the business). Substack is for writer-first content businesses.
Three options:
For a tailored stack recommendation across newsletters, social media, CRM and the rest, take our five-minute quiz. Newsletters are one capability; we pick winners across fifteen.
Our methodology page explains the testing process, the dating discipline, and the firewall between editorial and affiliate revenue. For related comparisons: Buffer vs Hootsuite vs Later covers social scheduling (the sister channel to newsletters); HubSpot vs Pipedrive covers CRM (relevant if your newsletter subscribers become sales leads); Gamma vs Beautiful.ai vs Canva covers presentations (often used to convert newsletter engagement into products).
Mailchimp is still the right pick for SMEs whose newsletter is one part of a broader marketing operation — segmentation-heavy transactional email, automations tied to your website, integration with dozens of other SaaS tools. It's fallen behind on pure content-newsletter UX, so if writing and shipping content is the whole point, Beehiiv or Substack are usually faster and cleaner. The category has genuinely split — Mailchimp is now an email marketing platform, while Beehiiv and Substack are newsletter publishing platforms.
Beehiiv is built for creators who treat their newsletter as a business — better analytics, more customisation, paid subscriptions with lower fees, a growth marketplace for cross-promotion, and full ownership of your subscriber list from day one. Substack is built for writers who want the lowest possible friction — you write, you publish, you keep 90% of subscription revenue after the 10% platform fee. Substack's discovery via the Substack app is genuine growth in a way Beehiiv doesn't have. Beehiiv wins on business features and unit economics; Substack wins on discovery and simplicity.
Mailchimp Standard at 5,000 contacts is roughly $75/month; at 25,000 contacts it's ~$285/month. Beehiiv Scale at 10,000 subscribers is $79/month, with the free plan usable up to 2,500 subscribers. Substack takes 10% of paid subscriptions with no monthly fee — so a free-only newsletter costs nothing, but a paid newsletter at $10,000/year revenue costs $1,000 in Substack fees vs Beehiiv's flat $948/year at 10k subs. For revenue-generating paid newsletters above roughly $2,000/month, Beehiiv's unit economics become materially better.
All three have credible deliverability in 2026, but the profile differs. Mailchimp has the deepest sender-reputation infrastructure and the most tools for managing bounces, spam complaints, and re-engagement — critical if you're sending to a large, mixed-quality list. Beehiiv invests heavily in deliverability with dedicated IPs available on paid tiers; results tend to be strong for opt-in subscriber bases. Substack piggybacks off its own sender infrastructure; deliverability is good but you have less control if you hit issues. For any list with meaningful email-marketing history (imported contacts, purchased leads, dormant subscribers), Mailchimp's tools help. For pure opt-in creator newsletters, all three are fine.
Yes, with meaningful caveats. Mailchimp → Beehiiv is well-supported; Beehiiv has documented importers and helper flows. Substack → Beehiiv is common and Substack allows CSV export of subscriber lists including paid subs. Substack → anywhere else requires manual work to re-establish paid subscriptions and Stripe connections. Mailchimp → Substack is less common because you'd usually be moving from marketing platform to content publisher — a genuinely different job. Plan on 2-8 hours of manual work per migration, and expect a 5-10% subscriber drop-off during the transition even under the best conditions.
Yes in the immediate sense — Substack lets you export your subscriber list at any time, so you're never locked in. The subtler risk is dependency on Substack's discovery engine (the app, recommendations, and cross-writer promotion) for growth. Writers who grow big on Substack sometimes find they've optimised for the Substack ecosystem rather than for the SME audience they'd targeted. If you're building a newsletter as part of a broader business (with a website, other channels, product), Beehiiv gives you more ownership over the growth engine. If the newsletter is the business, Substack's discovery is genuinely powerful.
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