Nitrosend scores 77.5 out of 100 to Mailjet's 60, and is the better choice on four of the seven things this review compares: running email from an AI agent, on-brand design without a designer, cost as the list grows, and how far the free plan goes. Mailjet, owned by Sinch, is one of the few platforms built like Nitrosend. It prices by emails sent and puts its sending APIs on every plan, so the two tie on receipts and newsletters in one plan and on the hands-on editor. The difference is who does the work. Mailjet is run by a person in a web app, and its MCP server only reads data. To send email from an AI agent with Nitrosend, connect Claude, ChatGPT, Cursor or Codex to its MCP server at api.nitrosend.com/mcp and sign in with OAuth: a single transactional email sends on the call, and campaigns and flows wait as drafts until they are approved. Nitrosend also costs less at every volume checked.
Nitrosend vs Mailjet, compared
The quick version: nine yes-or-no questions a team usually asks when choosing between the two. A tick means the product does it as described on its own pages today. A dash means the honest answer is not a yes or a no.
Nitrosend and Mailjet, side by side
Checked October 2, 2026| Question | Nitrosend | Mailjet |
|---|---|---|
| Send a campaign from the chatCan an agent send a marketing campaign without anyone opening the web app? | Yes. Yes, through the MCP server. Campaigns wait as drafts until approved. | No. No. Its MCP server is read only and does not send. |
| Hosted MCP connectorCan you connect an assistant without installing anything? | Yes. Yes. A remote MCP server and a ChatGPT app. | No. No. Its MCP server runs on your own computer. |
| Brand from your websiteDoes it learn your fonts and colors from your website? | Yes. Yes, with voice and house style kept in AI Memory. | Yes. Yes, with Brand Kit, from Starter. |
| Unsubscribes are freeDo contacts who unsubscribed stop counting toward the bill? | Yes. Yes. Contacts are unlimited on every plan. | Yes. Yes. The bill follows emails sent. |
| Transactional includedAre receipts and resets in the same plan as newsletters? | Yes. Yes, on every plan including Free. | Yes. Yes, APIs and SMTP on every plan. |
| Automations on the entry paid plansDo Starter or Essential include automated flows? | Yes. Yes. Flows run on every plan, Free included. | No. No. Automations start on Premium. |
| Free plan past 500 emails a monthDoes the free plan keep sending more than 500 emails a month? | Not a yes or no. 8,000 emails to start, then 500 a month. | Yes. Yes, 6,000 a month. |
| Free past 1,000 contactsCan the free plan hold more than 1,000 contacts? | Yes. Yes. Unlimited contacts on Free. | No. No. Free stops at 1,000. |
| Dedicated IP on the planDoes a mid-tier plan include a dedicated IP? | Not a yes or no. Available on Ultra at $50 a month. | Yes. Premium includes one from 100,000 emails. |
Nitrosend meets 7 of 7 yes-or-no questions on this page, Mailjet 5 of 9. Rows marked with a dash are not a yes or no question for that product.
How the two score
Seven tests, 100 points in all. Each product gets a score out of 10 on each one, and the total adds each score times the points for that test. Mailjet ties Nitrosend on two tests and wins one.
Each test, scored
Points out of 100, scores out of 10, October 2, 2026| What we compared | Points | Nitrosend | Mailjet |
|---|---|---|---|
| Run from an AI agent | 20 | 9 out of 10 | 3 out of 10 |
| On-brand design, no designer | 10 | 9 out of 10 | 7 out of 10 |
| Cost as the list grows | 20 | 9 out of 10 | 7 out of 10 |
| Free plan headroom | 10 | 7 out of 10 | 6 out of 10 |
| Transactional and marketing, one plan | 10 | 9 out of 10 | 9 out of 10 |
| Hands-on editor and templates | 15 | 6 out of 10 | 6 out of 10 |
| Integrations, support, track record | 15 | 5 out of 10 | 6 out of 10 |
| Total score | 100 | 77.5 out of 100 | 60 out of 100 |
Where each one runs out
Rank 1Nitrosend
77.5 out of 100Total
- Priced by
- Emails sent
- Free plan
- 8,000 emails, then 500 a month
- Entry plan
- $20 a month, 20,000 emails
- Run from an AI agent9 out of 10Official MCP server builds, tests and sends campaigns and flows from the chat; they wait as drafts until approved (MCP registry).
- On-brand design, no designer9 out of 10Brand Kit scans the site for colors, fonts and voice, and applies them to every draft on every plan (docs).
- Cost as the list grows9 out of 10Unlimited contacts on every plan. $20 a month for 20,000 emails, $100 for 125,000 (pricing).
- Free plan headroom7 out of 108,000 emails to start, then 500 a month, unlimited contacts. New accounts start at 100 recipients per rolling 24 hours (pricing).
- Transactional and marketing, one plan9 out of 10Transactional and marketing email share one allowance and one API on every plan, Free included (pricing).
- Hands-on editor and templates6 out of 10A block builder exists for editing by hand, but it is plainer, because the agent is the main way in.
- Integrations, support, track record5 out of 10Shopify, Stripe, HubSpot, Attio and Mailchimp, five bring-your-own sending providers, a Node SDK, a CLI and signed webhooks for transactional email, but a young product from a small team (docs).
Nitrosend
Ask your agent for the next campaign
Connect Nitrosend to Claude, ChatGPT, Cursor or Codex, point Brand Kit at your site, and describe the email. Contacts are unlimited on every plan.
Free: 8,000 emails to start, then 500 a month. No credit card.
Start free
Rank 2Mailjet
60 out of 100Total
- Priced by
- Emails sent
- Free plan
- 6,000 emails a month, 1,000 contacts
- Entry plan
- Starter, $9 a month, 8,000 emails
- Run from an AI agent3 out of 10Official MCP server runs on your own computer and registers only read (GET) tools, so an agent cannot send through it (GitHub).
- On-brand design, no designer7 out of 10Brand Kit pulls colors, fonts and logos from your site URL into its editor, not voice (Mailjet).
- Cost as the list grows7 out of 10Priced by sends with unlimited contacts. Automations need Premium: $41.90 for 20,000 emails, $112 for 100,000 (pricing).
- Free plan headroom6 out of 106,000 emails a month, 200 a day, up to 1,000 contacts, APIs included (pricing).
- Transactional and marketing, one plan9 out of 10APIs, SMTP relay and webhooks on every plan, Free included, alongside campaigns (pricing).
- Hands-on editor and templates6 out of 10Advanced email editor on every plan, 3.9 of 5 across 176 G2 reviews (G2).
- Integrations, support, track record6 out of 10Integrations catalog including HubSpot, Sinch as parent, and priority support on Premium (integrations).
The verdict in short
Mailjet is only better on one: integrations and support, because its integrations catalog, priority support on Premium and the backing of Sinch give it more reach than a young product.
Mailjet takes one of the seven tests outright and ties two. George Hartley, Nitrosend's co-founder, has said why he builds on email and where he thinks it is heading. On SaaS Stories in September 2026 he said why he builds on email: "It's like an open communication platform, SMTP. And so that means it's sort of, you know, it's free to build on and extend for anyone." In the same interview he said "what the future actually is, is agents doing all the work with other agents. And there's a human somewhere at the very top, vaguely directing, checking, whatever." Mailjet's reach is real; the question is how much of it your agent can use.
At a glance
Nitrosend and Mailjet are scored here on the same 7 tests, 100 points in all: Nitrosend 77.5 out of 100, Mailjet 60 out of 100. Nitrosend takes its best score on Run from an AI agent and On-brand design, no designer and Cost as the list grows and Transactional and marketing, one plan (9 out of 10) and its lowest on Integrations, support, track record (5 out of 10). Mailjet takes its best score on Transactional and marketing, one plan (9 out of 10) and its lowest on Run from an AI agent (3 out of 10). Mailjet scores higher on Integrations, support, track record. Scores are unadjusted, and every Mailjet figure was read on its own site on October 2, 2026.
How we scored
Each test is a question with one answer per product, checked against that product's own pages and independent review sites on October 2, 2026. A 10 means the product does the job fully on its standard plans. A 5 means it does part of it, or does it only on a higher plan or in a second product. Mailjet prices are monthly list prices in US dollars from its own pricing calculator.
Run from an AI agent, 20 of 100. Can an agent inside Claude, ChatGPT, Cursor or Codex compose a marketing campaign, test it, and send it, with no person opening the web app between the prompt and the send? Campaigns and flows that wait as drafts until they are approved count as inside the agent. Moving into the web app to finish does not. Scored on one written rule for every vendor: a first-party server the vendor runs and that can send counts fully; a third-party wrapper (Zapier, Composio, Kanopi, community servers) counts for less; a server that only drafts or reads counts for less than one that sends.
On-brand design, no designer, 10 of 100. Does the product learn your logo, colors, fonts and voice from your own site and apply them to every email it drafts, on the plan most small teams start on?
Cost as the list grows, 20 of 100. What does the bill do when the list grows but the number of emails you send does not? Scored on published list prices, before any promotional discount.
Free plan headroom, 10 of 100. How far can a team get on the free plan before it has to pay: contacts, total sends, and the daily ceiling.
Transactional and marketing, one plan, 10 of 100. Can receipts, password resets and newsletters go out from one account, on one bill, through one API?
Hands-on editor and templates, 15 of 100. For a person who wants to build the email themselves: how mature are the visual editor and the template library?
Integrations, support, track record, 15 of 100. How many tools does it plug into, what support comes with the plan, and how long has it been doing this at scale?
What each one costs in 2026
Mailjet prices by monthly email volume, and from Essential up contacts are unlimited, which puts it in the same camp as Nitrosend. The catch is where the features sit. Essential, $19 for 15,000 emails or $40 for 50,000, has no automations: Mailjet's subscription guide lists marketing automation under Premium. Nitrosend's $20 Pro plan includes flows, so this review prices Mailjet on Premium, the cheapest Mailjet plan that matches it.
Going past the plan works differently too. The same guide says Mailjet bills extra emails on any paid plan, at $2.58 per 1,000 on its 15,000-email tiers, charged when the plan renews, and that extra usage cannot be deactivated. Nitrosend Pro charges $0.19 per 100 extra, which is $1.90 per 1,000. On Mailjet the plan is not a spending cap, so a team that lets an assistant send should give it the monthly volume as well as the audience.
Here is what that looks like for a list that sends two campaigns a month.
What each one costs
List prices, USD, October 2, 2026| Scenario | Nitrosend | Mailjet |
|---|---|---|
| 10,000 contacts, two campaigns a month (20,000 emails) | Pro, $20 a month (20,000 emails) | Premium $41.90 a month (15,000-email tier at $29 plus 5,000 extra at $2.58 per 1,000) |
| 50,000 contacts, two campaigns a month (100,000 emails) | Ultra, $100 a month (125,000 emails) | Premium $112 a month |
| 100,000 contacts, two campaigns a month (200,000 emails) | Ultra plus 75,000 extra emails at $0.15 per 100, $212.50 a month | Premium $251 a month (100,000-email tier at $112 plus 100,000 extra at $1.39 per 1,000) |
| Add 25,000 transactional emails a month | Counted in the same allowance | Counted in the same email volume |
Nitrosend's price includes flows, unlimited contacts and transactional email from the same allowance, on every plan. The rates are on the Nitrosend pricing page, and what email marketing actually costs compares the models more widely. A new Nitrosend account starts on a lower daily recipient limit that rises as it earns sending standing, so a large list does not all go out on day one. Price both on the plan that runs your automations, not the cheapest tier.
Where Mailjet is the better pick
Mailjet takes one of the seven tests outright and ties two.
- Reach and support. An integrations catalog that includes HubSpot and Leadpages, priority support on Premium, and Sinch as its parent. Nitrosend has five data integrations and five sending providers, and it is a small team.
- Transactional email. A tie. Mailjet's APIs, SMTP relay and webhooks are on every plan, Free included, as Nitrosend's are.
- The editor. A tie. Mailjet's drag-and-drop editor comes on every plan, and its Brand Kit pulls colors, fonts and logos from a website, from Starter up.
Mailjet's agent story is the weak spot, and Mailjet's own MCP setup guide says why. The server lets Claude Desktop read contacts, campaigns, segments, statistics and workflows, and the guide calls the integration read only: it does not send emails or change Mailjet settings. Setting it up takes Git, Node.js and pnpm on the computer and an edit to Claude Desktop's config file, and the guide warns that on a company laptop IT may need to install those tools.
Two details matter more than the setup. First, the server runs over stdio, and under the MCP transport spec that means the client launches it as a subprocess, so it works in a desktop app on the one computer where it is installed. Nitrosend's server uses Streamable HTTP, the spec's transport for a server that handles many client connections, so one account connects from Claude, ChatGPT, Cursor or Codex wherever they run (docs). Second, the read-only limit lives in the program, not the credential. The published source turns only GET requests into tools, yet the config file holds the account's API key and secret key, the same pair Mailjet's Send API uses to send email. The tools cannot send, but the key on disk can. Nitrosend's hosted connection signs in with OAuth in the browser, so no key has to sit in a config file, and the agent composes, designs, tests and sends. The AI email marketing guide shows the workflow.
Moving from Mailjet to Nitrosend
There is no Mailjet connector in Nitrosend, so a move runs through an export and the agent.
- Contacts. Export each contact list from Mailjet as CSV, and import it in Contacts or through the imports API. Bring consent status across, because only subscribed contacts should be sendable.
- Transactional. Point the app's API or SMTP sends at Nitrosend, and move any templates by asking the agent to recreate them. The transactional email section explains how.
- Automations. Describe each Mailjet automation to the agent and it rebuilds it as a flow. Check each one before it goes live.
- Sending. Verify the domain, then send to the most engaged contacts first and grow from there. The domain warm-up guide covers the ramp.
- Run both. Keep Mailjet sending while you test the new domain, then move volume over in steps.
Which one to pick
Pick Mailjet if the team wants a long-established provider with Sinch behind it, relies on its integrations or priority support, or wants a free plan that keeps sending 6,000 emails a month to a small list.
Pick Nitrosend if an agent should write, design and send the email and build the flows from the assistant the team already uses, without installing a local server, or the team wants automations on its entry plan and a lower bill at 20,000 emails a month and up. The Nitrosend MCP server and the ChatGPT app are the two ways most teams start.
Nitrosend vs Mailjet FAQ
Yes, at every volume in the table. For 20,000 emails a month Nitrosend Pro is $20, and Mailjet Premium, the first Mailjet plan with automations, is $41.90: $29 for 15,000 emails plus 5,000 extra at $2.58 per 1,000. For 100,000 emails Nitrosend Ultra is $100 and Mailjet Premium $112.
Yes, an open-source one that runs on your own computer and connects to Claude Desktop. Mailjet's setup guide calls it read only: it reads contacts, campaigns and statistics, and does not send emails or change settings. It is not a hosted connector.
Add Nitrosend's MCP server, api.nitrosend.com/mcp, as a connector in Claude, ChatGPT, Cursor or Codex, and sign in with OAuth. Then ask in plain words. A single transactional email sends on the call. A campaign or flow is built and test-sent as a draft, and goes out once it is approved. The Nitrosend MCP page has the steps.
Not from Essential up, where contacts are unlimited and the price follows emails sent. The Free plan holds up to 1,000 contacts and Starter up to 2,000 (Mailjet).
It sends more each month, 6,000 emails at up to 200 a day, but it stops at 1,000 contacts. Nitrosend's Free plan sends 8,000 emails to start and then 500 a month, with unlimited contacts.
Mailjet lets you download a template as HTML or MJML. Keep the downloads as a reference, ask the agent to recreate each template, and Brand Kit keeps the result on brand.
Sending reputation belongs to the domain and does not move with the list. Verify the domain, send to the most engaged contacts first, and let the daily limit ramp. This review does not score deliverability, because neither product publishes a comparable inbox-placement number.