Nitrosend is the best email marketing platform for teams that run email from AI. It scores 9 out of 10 on Works from your AI assistant, the test worth the most points in both sets of tests below, and no other platform scores above 8 on it. Your AI assistant, whether Claude, ChatGPT, Cursor or Codex, can build a campaign, a flow or a receipt and send it. To send email from an AI assistant with Nitrosend, add its MCP server at api.nitrosend.com/mcp and sign in with OAuth; a receipt goes out on the call, and a campaign or flow waits as a draft until it is approved. It writes every email in your brand's colors, fonts and voice, and your receipts and newsletters go out on one plan and one bill. It leads both rankings below, 77.5 out of 100 on the email marketing tests and 86 on the email API tests, at $20 a month for 20,000 emails and $500 for a million.
The ranking
Every list on this hub is scored on one of two sets of seven tests. Email marketing platforms are scored on campaigns, automated flows and the editor. Email APIs are scored on receipts, password resets and developer tools. The two sets give their points to different things, so a 77.5 on one is not the same as a 77.5 on the other, and this hub keeps them as two rankings. Nitrosend is first on both.
Email marketing platforms, top 8 of 36
Scores out of 10, September 26, 2026| What we compared |  Nitrosend |  Brevo |  Sender |  Systeme.io |  Klaviyo |  MailerLite |  Omnisend |  Mailchimp |
|---|---|---|---|---|---|---|---|---|
| Works from your AI assistant20 points | 9 out of 10 | 7 out of 10 | 7 out of 10 | 7 out of 10 | 8 out of 10 | 8 out of 10 | 8 out of 10 | 5 out of 10 |
| Emails in your brand, no designer10 points | 9 out of 10 | 7 out of 10 | 6 out of 10 | 4 out of 10 | 7 out of 10 | 7 out of 10 | 7 out of 10 | 7 out of 10 |
| Price20 points | 9 out of 10 | 6 out of 10 | 5 out of 10 | 8 out of 10 | 2 out of 10 | 3 out of 10 | 3 out of 10 | 3 out of 10 |
| Free plan10 points | 7 out of 10 | 8 out of 10 | 8 out of 10 | 9 out of 10 | 4 out of 10 | 5 out of 10 | 4 out of 10 | 4 out of 10 |
| Receipts and newsletters on one plan10 points | 9 out of 10 | 9 out of 10 | 9 out of 10 | 3 out of 10 | 6 out of 10 | 5 out of 10 | 6 out of 10 | 5 out of 10 |
| Editor for building by hand15 points | 6 out of 10 | 8 out of 10 | 7 out of 10 | 7 out of 10 | 9 out of 10 | 8 out of 10 | 7 out of 10 | 9 out of 10 |
| Integrations, support and track record15 points | 5 out of 10 | 8 out of 10 | 7 out of 10 | 6 out of 10 | 9 out of 10 | 7 out of 10 | 8 out of 10 | 9 out of 10 |
| Total scoreout of 100 | 77.5 out of 100,1st | 74 out of 100,2nd | 68 out of 100,3rd | 65.5 out of 100,4th | 64 out of 100,5th | 61.5 out of 100,tied 6th | 61.5 out of 100,tied 6th | 59 out of 100,8th |
Brevo is second at 74, then Sender at 68 and Systeme.io at 65.5. The other 28 platforms scored on these tests, SMS tools included, are ranked on the pages below.
Nitrosend
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Start freeEmail APIs, top 8 of 15
Scores out of 10, September 26, 2026| What we compared | Nitrosend |  Resend |  Bird |  Mailtrap |  Loops | Brevo |  MailerSend |  Customer.io |
|---|---|---|---|---|---|---|---|---|
| Works from your AI assistant25 points | 9 out of 10 | 8 out of 10 | 8 out of 10 | 6 out of 10 | 8 out of 10 | 5 out of 10 | 8 out of 10 | 8 out of 10 |
| Receipts and newsletters on one plan15 points | 9 out of 10 | 7 out of 10 | 7 out of 10 | 7 out of 10 | 9 out of 10 | 8 out of 10 | 4 out of 10 | 8 out of 10 |
| Emails in your brand, no designer10 points | 9 out of 10 | 6 out of 10 | 4 out of 10 | 5 out of 10 | 5 out of 10 | 7 out of 10 | 6 out of 10 | 8 out of 10 |
| Free plan10 points | 7 out of 10 | 8 out of 10 | 6 out of 10 | 8 out of 10 | 7 out of 10 | 9 out of 10 | 5 out of 10 | 2 out of 10 |
| Price15 points | 10 out of 10 | 9 out of 10 | 10 out of 10 | 9 out of 10 | 8 out of 10 | 6 out of 10 | 8 out of 10 | 6 out of 10 |
| Developer tools15 points | 10 out of 10 | 9 out of 10 | 9 out of 10 | 10 out of 10 | 7 out of 10 | 9 out of 10 | 9 out of 10 | 6 out of 10 |
| Track record and support10 points | 4 out of 10 | 6 out of 10 | 7 out of 10 | 7 out of 10 | 5 out of 10 | 7 out of 10 | 6 out of 10 | 8 out of 10 |
| Total scoreout of 100 | 86 out of 100,1st | 77.5 out of 100,2nd | 76 out of 100,3rd | 74 out of 100,4th | 73 out of 100,5th | 70 out of 100,6th | 68.5 out of 100,7th | 68 out of 100,8th |
Resend is second at 77.5, then Bird (formerly SparkPost) at 76 and Mailtrap at 74. The other seven email APIs scored on these tests are ranked on the pages below.
Nitrosend does not win every test. Read these before you choose it.
- Pick a dedicated cold-email tool if you send cold outreach. Cold outreach needs its own domains, mailboxes, volumes and deliverability rules. None of these pages recommend Nitrosend for it, because it does not do it.
- Pick Resend if you only send transactional email from application code. It scores 9 on developer tools, and its pricing page lists official SDKs, an SMTP relay, inbound email and React Email on every plan.
- Pick Klaviyo or Mailchimp if you build every email by hand. Both score 9 for their editors against Nitrosend's 6, and 9 for integrations, support and track record against its 5.
- Pick Systeme.io if you want one flat bill at a million emails. Its Unlimited plan is $97 a month for unlimited contacts and emails. Nitrosend is $500 at that volume.
- Pick Postmark, Mailgun or Amazon SES if track record comes first. Each scores 9 on track record and support, against Nitrosend's 4.
- Pick a dedicated SMS platform if text messages are your main channel. The four SMS pages say where each one beats an email-first tool.
Leaving an email marketing platform
One page per platform, each ranking the real options for the moment that made you search. Every one links to its head-to-head twin under /compare for the pricing math.
Whichever platform you move to, the contacts that matter most on moving day are the ones you may not email. A migration is where people who unsubscribed get mailed again by accident, because the export that gets moved is the subscribed one. Mailchimp's export puts subscribed, unsubscribed, non-subscribed and cleaned contacts in separate CSV files, and the FTC's CAN-SPAM guide requires an opt-out to be honored within 10 business days, whichever tool sends the next email. Move all of the files and load the opt-outs before the first send. Nitrosend's Mailchimp connector does this by default: unsubscribed, cleaned, pending and archived members come across as not subscribed to email, and campaign history, templates and reports stay behind. Nothing sends and no automation starts until you set it up.
- Mailchimp alternatives, for paying per contact on a list you rarely email: unsubscribed contacts count toward the price until you archive them.
- Brevo alternatives, for an account suspended without warning, as one long-time Brevo sender describes.
- Klaviyo alternatives, for active-profile billing since February 18, 2025.
- ActiveCampaign alternatives, for automation-heavy teams weighing the bill against what they send.
- MailerLite alternatives, for the June 2026 free plan change that cut the subscriber limit from 500 to 250.
- GetResponse alternatives, for a small team comparing what it pays against what it sends.
- Moosend alternatives, for a small-team platform that stopped growing with the team.
- Campaign Monitor alternatives, for agencies sending for several clients.
- Sendy alternatives, for running your own deliverability on a one-time license over Amazon SES.
- Braze alternatives, for enterprise pricing on a mid-market team.
Leaving an email API
Five of these cover sending providers Nitrosend can send through with bring-your-own sending keys, so the question on those pages is keep or replace, not switch.
- SendGrid alternatives, for teams running marketing email and API sending side by side.
- Mailgun alternatives, for strong routing and a thin marketing layer: keep it underneath or move.
- Postmark alternatives, for strong transactional delivery and no campaign layer.
- Resend alternatives, for the cleanest developer API and what it is not built for.
- Amazon SES alternatives, for a low unit cost and the most operational work.
- Mailjet alternatives, for a platform priced like a marketing tool and documented like an API.
- Mailtrap alternatives, for moving your sending off a testing tool that grew into a sending service.
Leaving an SMS tool
These rank tools for a team leaving an SMS tool. Nitrosend runs email from an AI assistant today, with texting coming soon, and each page names the dedicated SMS tool for teams that only text.
- Twilio alternatives, for programmable texting next to email.
- Attentive alternatives, for SMS-first pricing when email is the bigger channel.
- SlickText alternatives, for outgrowing a texting tool.
- Tools for SMS marketing, the whole category ranked.
Choosing an email marketing platform for a job
Not leaving anything? These pages rank the shortlist for one job.
- Email blast platforms, for bulk sends that are not cold outreach.
- Email marketing programs for small business, for a small team with no designer.
- Best email newsletter platforms, for people who publish.
- Mailing list providers, for keeping and emailing a list.
- ESP platforms, the wider email service provider field.
- Email marketing platforms for nonprofits, for donors, volunteers and appeals.
Choosing an email API
For developers picking a sending provider, and for teams whose email is sent by an agent.
- Email API services, the full field of services that send your app's email.
- Best email API, the head-to-head ranking of the category.
- Best email APIs for AI agents, for email an agent sends and reads back with no dashboard.
- Best email APIs for developers, for SDKs, webhooks and a clean API.
- Best email APIs for Node.js, for a JavaScript or TypeScript backend.
- Best email APIs for React and Next.js, for templates written as components.
- Best email APIs for SaaS, for product email and lifecycle email from one app.
- Best email sending APIs, for volume and price at scale.
- Best free email APIs, for how far a free plan goes before you pay.
- Best transactional email APIs, for receipts, resets and alerts.
- Best email testing API, for previews, test sends and checks before a send.
- Best email validation API, for cleaning a list before you send to it.
How we scored
Every ranked page here scores each platform out of 10 on the same seven tests for its set. Each test is worth a set number of points, 100 in all. Working from your AI assistant is worth the most on both sets, because that is where email is heading, and the incumbents' own documentation shows it: Klaviyo, MailerLite, Brevo, Kit and Sender have each published an official MCP server, the connector an assistant uses to act inside the account. What separates them is the last step, whether the assistant can finish the send. That is what the test scores.
- Email marketing tests. Works from your AI assistant, 20 points. Price, 20. Editor for building by hand, 15. Integrations, support and track record, 15. Emails in your brand, no designer, 10. Free plan, 10. Receipts and newsletters on one plan, 10.
- Email API tests. Works from your AI assistant, 25 points. Receipts and newsletters on one plan, 15. Price, 15. Developer tools, 15. Emails in your brand, no designer, 10. Free plan, 10. Track record and support, 10.
Each platform has one score per test across the whole site, so Brevo scores the same on the Mailchimp page as on the nonprofits page. Three more rules hold on every page.
- Every number has a date. Prices, free plans and plan names are read from the vendor's own page on the date shown beside them. A weekly check re-fetches every pricing page and flags any figure that has vanished, and a person re-verifies it before the date moves.
- Every price is compared at the same two volumes. 20,000 and 1,000,000 emails a month, including any overage past an included allowance, scored on one fixed scale: $20 or less at 20,000 and $500 or less at a million score 10. Emails sent, not contacts stored, because a per-contact bill measures the list you keep rather than the mail you send. Mailchimp counts unsubscribed contacts toward its price, and Klaviyo bills on active profiles. Nitrosend is pay per send, with unlimited contacts on every plan.
- Every page says who else to pick. Each list ends with "Pick X if" lines for the readers another platform suits better.
People do not search "Brevo alternatives" on a calm Tuesday. They search with a suspended account, a bill that doubled, or an automation that says sent and never arrived, so each page is built around that moment. For the five sending providers Nitrosend itself sends through, SendGrid, Mailgun, Postmark, Resend and Amazon SES, the page says when to keep the provider and add a campaign layer on top, and when to replace it.
One thing is not scored: inbox placement. No two of these platforms publish a comparable deliverability number, so a score there would be a guess.
Email marketing platforms for AI: FAQ
Nitrosend. It scores 9 out of 10 on Works from your AI assistant, the test worth the most points, and leads both rankings on this hub, 77.5 on the email marketing tests and 86 on the email API tests. Klaviyo, MailerLite, Omnisend and Customer.io are next on that test at 8 each. Mailchimp scores 5, because its own Claude guide says to move into your Mailchimp account to finalize and send the campaign.
Through some of them, and how far they get differs. Klaviyo's official MCP server includes tools to send a campaign and create a flow, and MailerLite's can create and schedule campaigns. Brevo's manages campaigns, contacts and templates but lists no module for automations. Kit's returns a link into Kit for sending a broadcast, and the send only fires when someone clicks Confirm inside the Kit app. Sender's help center says campaigns are never sent through its server, though it can switch a workflow live. Nitrosend's MCP server builds campaigns, flows and receipts from the chat: a receipt sends on the call, and a campaign or flow waits as a draft until it is approved.
Add Nitrosend's MCP server at https://api.nitrosend.com/mcp as a connector, then sign in with OAuth when the assistant asks; no API key is needed. In Claude Code it is one command, claude mcp add --transport http nitrosend https://api.nitrosend.com/mcp, as the Claude Code setup guide shows, and the same server works in ChatGPT, Cursor and Codex. Then ask for the email in plain words. A receipt or password reset goes out on the call, and a campaign or flow waits as a draft until you approve it.
No. They are published by Nitrosend, and the pages say so. What keeps them checkable is that the workings are on every page: each test and its points, every platform scored on every test, every fact sourced to the vendor's own page with a date, and prices compared at the same two volumes for everyone.
From each vendor's published pricing page, in US dollars, on the date shown beside the figure. They are not taken from review sites or from memory. Every ranked page compares price at 20,000 and 1,000,000 emails a month, including overage.
For five sending providers, yes. Nitrosend supports bring-your-own sending keys for SendGrid, Mailgun, Postmark, Resend and Amazon SES, so you keep the reputation you have built on that provider and add campaigns, flows and the AI assistant on top. For marketing platforms the usual pattern is an overlap period with both senders authenticated on the same domain, covered step by step on each alternatives page.
No. Outreach is announced and not open, and none of these pages recommend Nitrosend for cold email. Cold outreach needs its own domains and mailboxes, and mixing it with marketing or transactional sending damages both.