Nitrosend vs Mailercloud.

Unlimited contacts, transactional on one bill, agent-native, and a published price.

TL;DR

Mailercloud is contact-priced email marketing. Every paid rung is a contact tier and the sending is unlimited under fair use, so a small list mailed hard costs $10 a month and the send volume never enters the bill. Deliverability tooling sits inside the product rather than beside it: blacklist monitoring, inbox placement tracking, and a dedicated IP option. If your list is small and you mail it often, that model is the argument, and it's a good one.

Nitrosend specializes in email and prices on what you send, so a large list mailed rarely doesn't move the bill. Transactional and campaigns are one product on one bill, where Mailercloud's Email API is a second subscription. MCP-first is the architecture here rather than an integration on top of one. Mailercloud has shipped a real MCP server of its own, and its tools reach the marketing product. Nitrosend's reach the sending domains, the deliverability posture, and the billing.

That single bill is the other difference worth naming, because transactional email arrives on the same account rather than a second subscription, addressed through one email API.

Pricing math

What you actually pay.

The two ladders are priced on opposite things. Mailercloud bills on the contacts you hold and lets you send without a volume price, and Nitrosend bills on the emails you send and never counts contacts. So each scenario carries a list size and a monthly volume, and the right-hand column is the rate for that contact tier before Mailercloud's 30% annual discount.

Scenario	Nitrosend	Mailercloud
Free	8,000 emails to start, then 500/mo forever. Unlimited contacts, 1 seat, full MCP, API, and CLI	12,000 emails/mo to 1,000 contacts, forever, no card. One automation, and MCP needs a paid plan
5,000 contacts, 20,000 emails/mo	$20 Pro: 20,000 emails, 3 seats, BYO sending and AI keys	$10 Premium: 5,000 contacts, unlimited sending under fair use, 25 automations
10,000 contacts, 100,000 emails/mo	$100 Ultra: 125,000 emails, 5 brands, 10 seats. Contacts never enter the price	$50 Premium at 10,000 contacts. Transactional is a separate Email API plan from $10
50,000 contacts, 500,000+ emails/mo	$300 Enterprise: 500K to 4M+ emails at a published price, with SSO and SAML	$230 Premium at 50,000 contacts. SSO and SAML sit on Enterprise, which is quote-only

Prices accurate as of August 2026. Check vendor sites for current rates.

Migration

How to switch (or run both).

Mailercloud keeps sending while you move, and both platforms can authenticate against the same domain for as long as the overlap lasts.

Add and verify your sending domain in Nitrosend. DKIM and SPF records sit alongside Mailercloud's, so both platforms send from the same domain while you overlap.
Export your contacts list by list, and check the columns before you import. Mailercloud keeps contacts in lists with custom fields, campaign tags, and a contact rating, and the tags and the rating are the parts that go missing on the way out. nitro_import_contacts takes the file: lists map onto lists and custom fields onto custom fields.
Start with one low-stakes message type. A receipt or a password reset, sent with nitro_send_message, tells you more in a week than a test send tells you in an hour. Let a campaign follow it, not lead it.
Rebuild automations as flows with nitro_compose_flow. Premium caps you at 25 automations, so the set is usually small enough to move in an afternoon. If you also pay for the Mailercloud Email API to carry transactional, this is the step where that second subscription stops.
Decide what carries your reputation. BYO sending keys on Pro and above route mail through Amazon SES, Resend, Postmark, Mailgun, or SendGrid, and Mailercloud's own pool isn't one of them, so a sender leaving its shared pool is warming a new path whichever platform it lands on. What travels with you is the domain and its authentication history.

Honest credit

What Mailercloud does well.

Picking a tool is about fit. Here's what Mailercloud is genuinely good at.

A free tier a real sender can work from: 12,000 emails a month to 1,000 contacts, forever, no card.
Unlimited sending under fair use on every paid tier, so mailing your list more often doesn't move the bill.
$10 a month for 5,000 contacts, published on the ladder, with no volume price on top of it.
Contact tiers stay published up the ladder instead of turning into a sales call partway up, and Premium is documented as covering over 600,000 contacts.
A live MCP server at mcp.mailercloud.com, shipped rather than left in beta, and included on every paid plan at no extra charge.
That server writes as well as it reads: create, schedule, and send campaigns, manage contacts and lists, build segments and read their performance, send transactional email, and pull reports.
It runs in any MCP-compatible client, Claude, ChatGPT, Cursor, and Gemini among them, authenticated with an API key you can revoke from settings.
Deliverability tooling is in the product rather than sold beside it: blacklist monitoring, inbox placement tracking, a dedicated IP option, and delivery by recipient time zone.
An Email API carrying both REST and SMTP, with webhooks on bounce, click, and complaint.

What Nitrosend adds

Where we think we're better.

Unlimited contacts on every plan, including Free, so a list that grows without being mailed never moves the bill.
We price on the emails you send, so the bill tracks the sending rather than the addresses you hold.
The two ladders cross over the moment your list gets bigger than your send volume, which is where most lists end up.
Transactional and campaigns are one product on one bill, where Mailercloud's Email API is a separate subscription from $10 for 50,000 emails a month.
Sending from the API and the MCP server works on our free plan, and Mailercloud's MCP needs a paid one.
MCP-first is an architecture, not an integration: every capability at Nitrosend is an API endpoint and an MCP tool before it's a screen.
Mailercloud's actions cover campaigns, contacts, lists, segments, transactional sends, and reports, which is the marketing product.
Our tools also cover the plumbing under the marketing product: sending domains and their DNS authentication, deliverability, billing, tests, and approvals.
Domain authentication, billing, and approvals are the steps that usually stop an automation dead and send someone back to a dashboard.
BYO sending keys on Pro and above route your mail through Amazon SES, Resend, Postmark, Mailgun, or SendGrid.
If you already send through one of those, BYO keeps your mail on the domain and IP you have warmed, so the move is reversible.

Use case fit

When to pick which.

Pick Mailercloud if

Your list is small and stable and you mail it hard, so unlimited sending at $10 for 5,000 contacts is the whole argument. Cost per contact is the number you're optimizing, and you'd rather read it off a published ladder than get it quoted. Being under 1,000 contacts points the same way, because free forever covers you. It's also the right call if you're happy running transactional on a second subscription, or you don't send transactional email at all.

Pick Nitrosend if

Email is the channel your program runs on and your list is much larger than your send volume, so you're tired of paying for addresses you never mail. Transactional and campaigns belong on one bill rather than two. Pick us too when you want the platform to answer to an agent end to end, including domain authentication, deliverability, billing, and the approval step, or when you want to send from the API on a free plan while you evaluate.

Where else to look

Teams comparing contact-priced ladders usually read the MailerLite comparison beside this one, then the MailerSend transactional writeup and the Mailgun breakdown if the sending half is the real purchase. The full provider comparison index lists the rest.

Mailercloud vs Nitrosend - common questions.

Can Nitrosend replace Mailercloud?

Yes, and both halves come with it. Campaigns, flows, segments, templates, contacts, and transactional sending are one product on one bill rather than a marketing plan plus an API plan. What changes is the pricing axis: Mailercloud charges for the contacts you hold and Nitrosend charges for the emails you send, so work out your list size against your monthly volume before you move anything.

Is Nitrosend cheaper than Mailercloud?

It depends which axis you're on. At a small list mailed hard, Mailercloud is cheaper on paper: $10 for 5,000 contacts with unlimited sending, against $20 Pro for 20,000 emails. The comparison inverts as the list grows without the sending growing, because $230 buys 50,000 contacts at Mailercloud while $100 Ultra buys 125,000 emails whatever the list size.

Mailercloud has an MCP server too. What's actually different?

Order of construction, and what it reaches. Mailercloud built a dashboard, then an API, then exposed 50+ actions as MCP tools over the marketing product: campaigns, contacts, lists, segments, transactional sends, and reports. Nitrosend was built the other way round, so every capability is an endpoint and a tool before it's a screen, and that includes sending domains, deliverability, billing, tests, and approvals.

Can I move my lists and custom fields across?

Yes, and those two are the parts that cross over cleanly. What doesn't travel is Mailercloud's own scoring: a contact rating has no counterpart on this side, and campaign tags stop working as segment inputs because the campaign history behind them stays put. Any segment built on a rating or a tag needs a fresh rule written against a field you actually exported. Once the import lands, check the per-list counts, spot-check custom fields on a few contacts, and rebuild those segments before you turn a flow on.

Start with the free tier.

8,000 emails to start, then 500 a month, unlimited contacts, full MCP, API and CLI access. No credit card.