Your SaaS Needs Two Email Tools, Not One
Transactional vs newsletter email are two different jobs. The honest builder's map: Resend, beehiiv, Kit, and the cheaper alternatives, with real 2026 pricing.
Almost every builder I talk to is hunting for the one email tool. The right one, the cheap one, the one that does it all. That search is the mistake. Email is not one job, it is two, and the tools that win at one are usually bad at the other. Once you see the split, the choice gets simple and a lot cheaper.
- Email is two jobs: product/transactional and newsletter/marketing. Do not force one tool to do both.
- Product email (signup, receipts, onboarding sequences): use Resend.
- A newsletter or brand audience: use beehiiv.
- At about 1,000 subscribers, Kit is actually cheaper than beehiiv. The price flips by list size.
- Solo and early? Resend plus beehiiv is your whole stack. The rest is for later.
The mistake: one tool for everything
The "do it all" email tool sounds efficient. In practice it is how you end up sending password resets from a marketing platform that throttles you, or trying to grow a newsletter on a transactional service with no audience features. The jobs pull in opposite directions.
So separate them on purpose. One layer handles the email your product sends. Another handles the email your brand sends. Different senders, different tools, different rules.
Job A · Product email
Transactional and onboarding: Resend
This is the email your app sends because something happened: a signup to verify, a receipt to deliver, a password to reset. It has to arrive, every time, and it lives in your code. Resend owns this job. The API and developer experience are the cleanest in the category, and the contact data sits in your own database, not a marketing tool's.
The update most builders missed: in April 2026 Resend shipped Automations, event-triggered lifecycle sequences. Fire a "user signed up" event and it runs a timed onboarding drip. That used to be the one reason you would bolt a marketing tool onto a new product. Now Resend covers transactional and onboarding in one place, so early on you may not need a second tool at all.
Job B · Newsletter and marketing
Audience email: beehiiv, Kit, and the budget options
This is the email your brand sends to people who chose to hear from you: the newsletter, the launch announcement, the "here is how to get more out of the product" drip. The job here is not reliability under the hood, it is growth and engagement. This is where Resend stops and a newsletter tool starts.
For a build-in-public brand or a content newsletter, beehiiv is the pick. It is built to grow an audience: a recommendation network that is on the free plan, Boosts, a native ad network that brings sponsors to you, and it takes 0% of any paid-subscription revenue. The automation is simple (welcome flows and drips), which is exactly enough for a newsletter.
Inside Job B
beehiiv vs Kit, head to head
These two get compared constantly, so here is the straight version on verified pricing, both at 1,000 subscribers on monthly billing.
At a small list, Kit is the cheaper one, which surprises people who have read that beehiiv is always the budget pick. That is true only at larger subscriber counts, where reviews put Kit higher after its 2026 price increase. Run both sliders at your real number before you decide.
| Category | beehiiv | Kit |
|---|---|---|
| Free tier | Edge: beehiiv 2,500 subs, unlimited sends, Recommendation Network | Free plan with 1 basic automation and product selling |
| Price (1k subs) | $49 / $109 | Edge: Kit $39 / $79 |
| Automation | Welcome + drips, limited branching | Edge: Kit Visual builder, IF/THEN, tags, branches |
| Newsletter growth | Edge: beehiiv Ad network, Boosts, referrals built in | Creator Network |
| Selling products | On Scale ($49) and up | Edge: Kit Sell on the free plan; mature checkout |
| Cut on subscriptions | Edge: beehiiv 0% | Small per-transaction fee |
| Best for | Growing and monetizing a newsletter | Selling products and complex funnels |
Do not pay for a funnel engine to send a weekly email.
The call: beehiiv if your goal is to grow a newsletter and earn from it. Kit if you sell your own products to the list and need branching automation. For a build-in-public brand whose first job is just to grow, beehiiv's free recommendation network outweighs the few dollars Kit saves.
Still Job B
The cheaper alternatives: MailerLite, Brevo, Sender
If beehiiv's growth machine is not what you need and you just want marketing automation cheaply, three tools are worth knowing. Unlike beehiiv and Kit, all three put real automation on the free plan.
| Tool | Pricing model | Free plan | Best when |
|---|---|---|---|
| MailerLite | Subscriber count | 1,000 subs, ~12k sends, basic automation | Easiest start Light, clean, beginner-friendly |
| Brevo | By send volume Not by subscribers | Unlimited contacts, ~300/day, automation | Big list, low send frequency |
| Sender | Contacts + sends | 2,500 subs, ~15k sends, automation | Total beginner, no fuss |
The hidden lesson is the pricing model. beehiiv, Kit and MailerLite charge by subscriber count. Brevo charges by send volume. So if you have a big list you email rarely, Brevo can stay free or cheap where the others would charge you for every contact. The cheapest tool depends on the shape of your list, not a single headline price.
One honest caveat for builders: these three are marketing-email tools, not newsletter-growth platforms. They do not have beehiiv's recommendation network or Boosts. If growing the audience is the point, saving ten dollars a month on a tool with no growth engine is a bad trade.
The verdict: your actual stack
For most solo builders, the whole answer is two tools, and you can stop reading after this.
Resend for the product. beehiiv for the audience.
Resend handles transactional email and onboarding sequences, with your contacts in your own database. beehiiv handles the newsletter and the growth. Two tools, two jobs, done. That is the stack for a build-in-public SaaS.
Kit or MailerLite when you need a real marketing CRM.
The day you are segmenting users by behavior, running branching funnels, or selling several products to the list, graduate to Kit (deepest automation) or MailerLite (cheapest balance). Not before. Distribution beats features, and an unused tool is just overhead.
Two jobs. Two tools. Resist the third until the data demands it.
Takeaways for other builders
- Email is two jobs. Split product email from brand email and the tool choice gets obvious.
- Resend now does onboarding too. Since April 2026 it runs lifecycle sequences, so early on you may not need a marketing tool at all.
- Free tiers gate automation differently. beehiiv and Kit keep real flows on paid plans; MailerLite, Brevo and Sender automate for free.
- The cheapest tool depends on your list shape. Subscriber-based vs send-based pricing decides it, not the headline number.
- Discount "best tool" content for affiliate bias, including this post. Verify every figure on the source's own pricing page.
Builders and future builders are already on the list. Every time I map a corner of the stack, you get the verdict before anyone else.
FAQ
Should I use Resend or beehiiv for my SaaS?
Both, for different jobs. Use Resend for product email like signup, receipts, and password resets, and for onboarding sequences. Use beehiiv for a newsletter or brand audience. They are not competitors, they sit in different layers of your stack.
Is beehiiv or Kit cheaper?
It depends on your list size. At around 1,000 subscribers on monthly billing, Kit's paid tiers ($39 and $79) undercut beehiiv's ($49 and $109). At larger lists the gap can flip, so check both with your real subscriber count before deciding.
Can Resend send marketing newsletters?
Not really. Resend is built for transactional and lifecycle email, and since April 2026 it can run event-triggered onboarding sequences. For broadcasts and audience growth, use a newsletter tool like beehiiv instead.
What is the simplest email stack for a solo SaaS builder?
Resend for product email, including onboarding sequences, and one newsletter tool for your audience. You usually do not need a separate marketing CRM like Kit or MailerLite until you are segmenting and selling to the list at scale.