Beehiiv, Kit, Loops, Customer.io, MailerLite, Brevo — the key tradeoffs, the pricing math, and the founder type each one fits.
Research-based roundup. This article synthesizes public documentation, pricing pages, and user reports as of May 2026. We have not personally used every tool listed. Where we use a tool ourselves (Beehiiv), it’s called out explicitly. How we research.
This roundup covers marketing email tools: newsletters, drip sequences, broadcast campaigns, lifecycle email, and behavior-triggered nurture flows. These are the tools you reach for when you want to grow a list, send a weekly update, or run a launch campaign.
It is not a roundup of transactional email infrastructure — the APIs you call from your application code to send password resets, receipts, magic links, or order confirmations. Those tools (Resend, Postmark, SendGrid, Amazon SES) sit at a different layer of your stack and are evaluated on different axes (deliverability, API quality, webhook reliability, cost per email at high volume). If transactional is what you’re looking for, see our Resend vs SendGrid breakdown and Resend pricing explained.
Many SaaS products end up running both: a transactional service for application emails and a marketing service for human-written communication. A few tools below — Loops and Customer.io — blur the line and try to do both.
Built by ex-Morning Brew operators. Newsletter publishing, ad network, paid subscriptions with 0% platform fee, and a referral program built in. Free tier covers up to 2,500 subscribers.
Beehiiv was built by ex-Morning Brew operators specifically for newsletter publishing. Where most email tools treat broadcasts as one feature among many, Beehiiv treats it as the entire product — the publishing flow, segmentation, growth tools, and monetization all assume your job is to grow and engage a newsletter audience.
Per Beehiiv’s pricing page, the free Launch tier supports up to 2,500 subscribers with core features included; paid tiers (Scale, Max, Enterprise) unlock advanced segmentation, custom branding, and team seats. Critically, Beehiiv charges 0% platform fee on paid newsletter subscriptions — you pay only the Stripe fee, not a take rate. Substack charges 10%; this is the concrete differentiator. Our Beehiiv vs Substack breakdown covers the comparison in detail, and Beehiiv pricing explained walks the tier ladder.
Disclosure: The Beehiiv links on this page are affiliate links. We use Beehiiv for our own newsletter at Prompts to Product. The affiliate relationship does not affect our recommendation — Beehiiv would be our top pick for newsletter-first founders regardless.
Rebranded from ConvertKit in 2024. Visual automation builder, tag-based segmentation, landing pages, paid newsletters, and creator-network features. Free up to 10,000 subscribers on Newsletter plan; Creator and Creator Pro tiers unlock advanced automation and integrations.
Kit is the canonical email tool for creators — bloggers, course makers, podcasters, authors, and bootstrapped founders whose growth depends on a personal audience. The automation and tagging primitives map well to creator workflows: opt in for a lead magnet, get tagged, then move into a nurture sequence that sells a course or membership.
Per Kit’s pricing page, the free Newsletter plan covers basic broadcasting up to 10,000 subscribers but excludes visual automations and sequences. The paid Creator plan starts at $25/month for 1,000 subscribers and scales by list size; Creator Pro adds advanced reporting. The paid tier kicks in around 1,000 subscribers if you need automation — which most creator funnels do. Kit is not the right pick for behavior-triggered product email; its triggers are list-and-tag based, not event-based.
Modern email platform that handles both marketing campaigns and transactional/product email from one stack. Event-based triggers, audience segmentation by user properties, and a clean API. Free tier with limits, then paid plans starting around $49/month per Loops’ pricing page.
Loops is positioned at modern B2B SaaS. The pitch: instead of running marketing email in one tool and transactional in another, do both in Loops. The tradeoff: deliverability for transactional vs marketing benefits from separate sending domains, and Loops’ transactional offering is less battle-tested than Postmark or Resend.
Per Loops’ pricing, paid plans start around $49/month for the entry tier, scaling by contact volume. The product’s strength is the audience model — user properties propagate cleanly across transactional and marketing — and the DX for event-based triggers is well-regarded. Loops fits if your email program is built around product events; it’s less natural for content-led list-building.
Long-running player in lifecycle and behavior-triggered email. Visual workflow builder, deep segmentation, in-app messages, push, and SMS in addition to email. Pricing scales by profiles + features and can get expensive fast for solo founders.
Customer.io has been the canonical behavior-triggered email tool for B2B SaaS for over a decade — the platform you graduate to when your email program is genuinely event-driven (“send this when a user invites a teammate but the teammate hasn’t accepted in 3 days”). Per Customer.io’s pricing page, Essentials starts at $100/month, Premium at $1,000/month, with Enterprise above. A startup plan exists in some regions.
At solo-founder scale, Customer.io is overkill on cost and complexity — the setup model assumes an engineering team and a data pipeline. Most solo B2B founders are better served by Loops at $49. Customer.io makes sense when you have meaningful event volume, a real lifecycle map, and someone whose job includes the email program.
One of the lowest-cost paid email tools in the market. Free up to 1,000 subscribers and 12,000 emails/month per MailerLite’s pricing page. Decent automation, landing pages, and a clean editor. Less polish than Beehiiv or Kit, but materially cheaper.
MailerLite is the value pick. The free tier is genuinely usable for commercial projects (1,000 subscribers, 12,000 emails/month), and the paid tier ramps slowly — cheaper than Kit, Beehiiv, or any of the lifecycle-focused tools at comparable subscriber counts. Per MailerLite’s pricing page, the Growing Business plan starts around $10/month for 500 subscribers and scales by list size, with Advanced and Enterprise tiers above.
The tradeoffs: less polish, less native integration with creator-economy tools, and an automation builder that’s capable but feels less premium than Kit’s. For founders whose email needs are “send a monthly newsletter and a basic welcome sequence” and whose budget is tight, MailerLite is a defensible pick. It’s less of a fit if you want to monetize the newsletter directly (Beehiiv and Substack are stronger here) or run sophisticated lifecycle programs (Loops or Customer.io are stronger).
Broad feature set: marketing email, transactional email, SMS, WhatsApp, CRM, and chat. EU-headquartered, GDPR-friendly defaults. Free tier up to 300 emails/day with unlimited contacts.
Brevo (rebranded from Sendinblue in 2023) is the “swiss army knife” pick. Per Brevo’s pricing page, the Free plan allows up to 300 emails per day with unlimited contacts — an unusual tradeoff that favors small lists you email frequently over large lists you email rarely. Paid plans price by monthly email volume rather than subscriber count, which is the inverse of most tools on this list. For a solo founder with a 50,000-subscriber list that emails monthly, Brevo can be cheaper than Kit or Beehiiv at the same volume.
The other thing Brevo does that few competitors match is multi-channel: SMS, WhatsApp, and a built-in CRM all live alongside email in the same dashboard. For founders selling internationally (especially in markets where SMS or WhatsApp are normal channels for product communication), Brevo’s breadth is genuinely useful. The downside is a slightly less polished email editor and fewer creator-economy integrations than Kit or Beehiiv.
HubSpot offers a generous-looking free tier on Marketing Hub. We list it here specifically to advise against it for solo SaaS founders. Three reasons:
If you genuinely need a CRM in addition to email and you’re not yet at the scale where a real GTM stack is justified, Brevo’s built-in CRM or a standalone tool like Attio is a better starting point.
Newsletter is your acquisition channel. Free up to 2,500 subs, 0% platform fee on paid tiers, ad network and referral tools built in. The closest thing to a turnkey newsletter operating system. Start a Beehiiv newsletter →
You sell courses, memberships, or info products. Tag-based segmentation and visual automation builder fit creator funnels. Plan for the paid tier to kick in around 1,000 subscribers if automation matters.
Your email program is event-driven (sign-up → activated → engaged → at-risk). Loops at $49/month is the right starting point for most solo B2B founders. Move to Customer.io only when event volume, segmentation complexity, and team headcount justify the step-up in cost and setup.
You need a working newsletter and a welcome sequence and you don’t care about polish. Free tier covers commercial use up to 1,000 subscribers; paid tier is the cheapest credible option in this category.
You want email, SMS, WhatsApp, and a CRM under one roof, and you bill in euros. Pricing-by-volume rather than by subscriber count works well for large lists you email infrequently.
If your acquisition motion is content-led (SEO, social, podcast, newsletter swaps), start with Beehiiv. If your motion is product-led (free trial, freemium, in-app activation), start with Loops. You can switch later, but most founders pick the wrong category-of-tool, not the wrong tool-within-category — pick on motion first, brand second.
For more on the surrounding stack, see our cold email playbook for outbound sequences, and SEO for SaaS playbook for building the content engine that feeds your newsletter list. If you also need transactional infrastructure for password resets and receipts, start with our Resend vs SendGrid comparison.
The stack, prompts, pricing, and mistakes to avoid — for solo founders building with AI.