Nitrosend is the better choice than Campaign Monitor on five of the seven things this review compares: running email from an AI agent, on-brand design without a designer, cost as the list grows, the free plan, and sending transactional and marketing email on one plan. Campaign Monitor is a polished, template-led platform that a person runs from a web app and pays for by the subscriber, and it has no first-party way for an AI agent to operate it. Nitrosend is built so an agent inside Claude, ChatGPT, Cursor or Codex writes, designs and sends the email, and it bills by the emails sent rather than the people on the list. To send email from an AI agent with Nitrosend, add the Nitrosend MCP server at api.nitrosend.com/mcp to Claude, ChatGPT, Cursor or Codex and sign in with OAuth; the agent can then draft, test and send campaigns, flows and transactional email.
Nitrosend vs Campaign Monitor, compared
The quick version: eight 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 Campaign Monitor, side by side
Checked September 25, 2026| Question | Nitrosend | Campaign Monitor |
|---|---|---|
| Send a campaign from the chatCan an agent send a marketing campaign without anyone opening the web app? | Yes. Yes, through the MCP server. A single transactional email sends on the call; campaigns and flows stay drafts until approved. | No. No. There is no first-party MCP server or assistant connector. |
| Official MCP serverIs there a first-party MCP server for marketing email? | Yes. Yes. Listed as com.nitrosend/nitrosend on the official MCP registry. | No. No. Only third-party servers exist. |
| Brand from your websiteCan it build an on-brand email from your website? | Yes. Yes. Brand Kit scans the site, including voice. | Yes. Yes, with Marketing Studio, limited on lower plans. |
| Unsubscribes are freeDo contacts who unsubscribed stop counting toward the bill? | Yes. Yes. Contacts are unlimited on every plan. | Yes. Yes. Unsubscribed and bounced subscribers are not billed. |
| Duplicates billed onceDoes a person on two lists count once? | Yes. Yes. Contacts are free, so duplicates cost nothing. | No. No. Each list membership counts toward the total. |
| Transactional includedAre receipts and resets in the same plan as newsletters? | Yes. Yes, on every plan including Free. | Yes. Yes, on Essentials and Premier, with a send limit. |
| Free planIs there a free plan with no time limit? | Yes. Yes. 8,000 emails, then 500 a month, forever. | No. No. A 30-day trial. |
| Mature drag-and-drop editorIs there a polished visual editor for a person building by hand? | Not a yes or no. A block builder exists. The agent is the main way in. | Yes. Yes, and its templates are a long-standing strength. |
Nitrosend meets 7 of 7 yes-or-no questions on this page, Campaign Monitor 4 of 8. 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. Campaign Monitor comes close on transactional email, which it includes on its Essentials and Premier plans.
Each test, scored
Points out of 100, scores out of 10, September 25, 2026| What we compared | Points | Nitrosend | Campaign Monitor |
|---|---|---|---|
| Run from an AI agent | 20 | 9 out of 10 | 2 out of 10 |
| On-brand design, no designer | 10 | 9 out of 10 | 6 out of 10 |
| Cost as the list grows | 20 | 9 out of 10 | 3 out of 10 |
| Free plan headroom | 10 | 7 out of 10 | 1 out of 10 |
| Transactional and marketing, one plan | 10 | 9 out of 10 | 8 out of 10 |
| Hands-on editor and templates | 15 | 6 out of 10 | 8 out of 10 |
| Integrations, support, track record | 15 | 5 out of 10 | 8 out of 10 |
| Total score | 100 | 77.5 out of 100 | 49 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 runs campaigns, flows and sends from the chat; campaigns and flows stay 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 2Campaign Monitor
49 out of 100Total
- Priced by
- Subscribers
- Free plan
- None, a 30-day trial
- Entry plan
- Lite, priced by subscriber tier
- Run from an AI agent2 out of 10No first-party MCP server or AI-assistant connector. Its AI tools live inside the web app (pricing).
- On-brand design, no designer6 out of 10Marketing Studio builds a branded email from your website inside the app, with limited access on lower plans (pricing).
- Cost as the list grows3 out of 10Priced by subscribers, duplicates across lists counted twice. A$277 a month for 10,000 on Essentials (help).
- Free plan headroom1 out of 10No free plan. A 30-day trial sending to 500 people, at most 100 a day (help).
- Transactional and marketing, one plan8 out of 10Transactional is included on Essentials and Premier, with a separate send limit tied to subscriber tier (help).
- Hands-on editor and templates8 out of 10A polished email builder and template library, 4.1 of 5 across 731 reviews (G2).
- Integrations, support, track record8 out of 10250+ integrations and phone support on Premier (pricing).
The verdict in short
Campaign Monitor is only better on two: the hands-on editor and templates, because design quality has long been its strength with agencies, and integrations, support and track record, because 250+ integrations and phone support on Premier are hard to match.
Design quality in Campaign Monitor's editor is built for a person dragging blocks. George Hartley, Nitrosend's co-founder, has a view on it. On SaaS Stories in September 2026 he pitched Nitrosend to anyone "sick of, sick of wasting your life in, in kind of, you know, [WYSIWYG] editors". In the same interview he said agencies can now set up their standard flows for each client "on the same session. So, it's like a prompt or two instead of an afternoon." For an agency whose assistant does the client work, the second point weighs more.
At a glance
Nitrosend and Campaign Monitor are scored here on the same 7 tests, 100 points in all: Nitrosend 77.5 out of 100, Campaign Monitor 49 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). Campaign Monitor takes its best score on Transactional and marketing, one plan and Hands-on editor and templates and Integrations, support, track record (8 out of 10) and its lowest on Free plan headroom (1 out of 10). Campaign Monitor scores higher on Hands-on editor and templates and Integrations, support, track record. Scores are unadjusted, and every Campaign Monitor figure was read on its own site on September 25, 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 September 25, 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. Campaign Monitor's page showed only Australian-dollar prices, so its costs are given in A$ and US-dollar prices are left out rather than converted.
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? An approval step the person answers in the chat counts 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
Campaign Monitor prices by active subscribers across every list in the account. Its billing help says unsubscribed and bounced people do not count, but a person on two lists counts twice. Lite caps sends at five emails per subscriber a month, and Essentials and Premier send unlimited campaigns with a separate transactional limit.
Nitrosend does not charge for contacts, so duplicates and quiet subscribers cost nothing. The Nitrosend pricing page puts it as paying for what you send, not who you store. The two models are compared in what email marketing actually costs.
Per-list counting matters more once an agent does the list work. An agent that imports each new CSV as its own list, or builds a fresh list for one campaign, adds a billed subscriber for every person it copies into a second list. In Nitrosend contacts are free, so that housekeeping costs nothing.
Here is what that looks like for a list that sends two campaigns a month.
What each one costs
Nitrosend in USD, Campaign Monitor in AUD, September 25, 2026| Scenario | Nitrosend | Campaign Monitor |
|---|---|---|
| 10,000 contacts, two campaigns a month (20,000 emails) | Pro, $20 a month (20,000 emails) | Lite A$180 a month, Essentials A$277 |
| 50,000 contacts, two campaigns a month (100,000 emails) | Ultra, $100 a month (125,000 emails) | Lite A$606 a month, Essentials A$985 |
| 100,000 contacts, two campaigns a month (200,000 emails) | Ultra plus 75,000 extra emails at $0.15 per 100, $212.50 a month | Not published above 50,000 subscribers |
| Add transactional email | Counted in the same allowance | Included on Essentials and Premier up to a tier limit |
Campaign Monitor's pricing page served Australian dollars and offered no way to switch, and its help center does not publish prices because it bills in several currencies. So the table shows its A$ prices as read, and leaves out a US-dollar figure rather than guess one. Even before conversion, the gap at 50,000 subscribers is several times the Nitrosend bill.
Where Campaign Monitor is the better pick
Campaign Monitor takes two of the seven tests outright.
- Design and templates. A polished email builder and template library that agencies and designers have relied on for years. Its 731 reviews on G2 average 4.1 out of 5.
- The ecosystem. 250+ integrations, an API, and phone support on Premier (pricing). Nitrosend has five data integrations and five sending providers, and it is a small team.
It is also close on one of Nitrosend's strengths. Essentials and Premier include transactional email on the same bill, with a monthly allowance that grows with the subscriber tier (billing help).
Campaign Monitor has agency billing tools Nitrosend does not. Its pricing page lists a markup on the base price that its own billing system charges each client, and private labeling that replaces Campaign Monitor's branding in the app with the agency's. Clients sit as sub-accounts under one admin account there; in Nitrosend each client is a brand. The Nitrosend pricing page lists no client billing. What Nitrosend changes for an agency is the cost of taking on a client. Pro at $20 includes five brands, the email allowance is shared across the account, and contacts are unlimited, so a new client's whole list can be loaded into its own brand and costs nothing until that brand sends. On Campaign Monitor the same list counts toward the monthly price as soon as its subscribers are active, once for every list they sit on.
The gap is the agent. Campaign Monitor's AI features, AI Writer, Segment Mapper and Marketing Studio, all live inside its web app (pricing), and there is no official MCP server or assistant connector for Claude or ChatGPT. Its API shows where the line sits. A smart transactional email, the kind used for receipts and password resets, is "defined inside Campaign Monitor", and the transactional API can list, read and send those emails but has no call to create one. An agent can trigger a receipt that someone designed in the app; it cannot write the receipt. In Nitrosend the agent creates the template through the MCP server, a single transactional email sends on the call, and campaigns and flows stay drafts until approved. The AI email marketing guide shows the workflow.
Moving from Campaign Monitor to Nitrosend
There is no Campaign Monitor connector in Nitrosend, so a move runs through an export and the agent.
- Subscribers. Export each list as CSV with custom fields and import them in Contacts or through the imports API. Merge the duplicates as you go, since Nitrosend does not bill for them. Bring consent status across, because only subscribed contacts should be sendable.
- Journeys and transactional emails. Describe each journey to the agent and it rebuilds it as a flow, with test sends before anything goes live. Smart transactional emails built in Campaign Monitor's Email Builder do not come out through the API, which returns "Content managed in Email Builder" in place of the HTML (transactional API). Send yourself a test of each one and give it to the agent to rebuild.
- Sending. Verify the domain, then send to the most engaged subscribers first and increase from there. The domain warm-up guide covers the ramp.
- Receipts. Point the app's transactional sends at the Nitrosend API on the same plan. The transactional email section explains how.
- Run both. Keep Campaign Monitor until its renewal while new flows move over.
Which one to pick
Pick Campaign Monitor if a designer or agency builds each email by hand and cares most about the template library, the agency bills clients through the platform with a markup or a private-label app, the team needs phone support, or it relies on one of its 250+ integrations.
Pick Nitrosend if an agent should write, design and send the email from the assistant the team already uses, the account carries duplicate or rarely emailed subscribers, an agency wants to run several client brands from one assistant on one plan, or the team wants a free plan with no time limit. The Nitrosend MCP server and the ChatGPT app are the two ways most teams start.
Nitrosend vs Campaign Monitor FAQ
Yes. Campaign Monitor bills by subscribers across all lists, so 10,000 subscribers on Essentials cost A$277 a month on its Australian pricing page. Nitrosend bills by emails sent: $20 a month for 20,000 and $100 for 125,000, with unlimited contacts.
Not a first-party one. A third-party server from Kanopi Studios wraps the full v3.3 API, sending included, and runs on your own computer with a Campaign Monitor API key or OAuth. Campaign Monitor itself offers no official MCP server, Claude connector or ChatGPT app, and its AI tools work inside its web app.
Yes. Its billing help says an email address active on several lists counts once per list. Unsubscribed, bounced and unconfirmed subscribers do not count.
No. Campaign Monitor offers a 30-day trial that sends to up to 500 people, at most 100 a day. Nitrosend's Free plan has no time limit: 8,000 emails to start, then 500 a month.
Yes, on Essentials and Premier, with a monthly transactional allowance tied to the subscriber tier (billing help). On Lite, transactional emails count toward the plan's single send limit.
Add the Nitrosend MCP server to Claude, or to ChatGPT, Cursor or Codex, and sign in with OAuth. Import your subscribers as a CSV and point Brand Kit at your website. Then describe the campaign: the agent drafts it in your brand, sends you a test, and the campaign stays a draft until it is approved. The MCP server page has the setup steps.
Sending reputation belongs to the domain and does not move with the list. Verify the domain, send to the most engaged subscribers first, and let the daily limit ramp. This review does not score deliverability, because neither product publishes a comparable inbox-placement number.