Nitrosend is the better choice than Selzy for running email from an AI agent, and it leads 77.5 to 56.5 on the seven tests below. It wins five of them: working from your AI assistant, on-brand design without a designer, cost as the list grows, the free plan, and receipts and newsletters on one plan. Selzy is an affordable email marketing platform with an AI-assisted builder, round-the-clock support and its own MCP server for campaigns, priced by the contact. Nitrosend lets an agent inside Claude, ChatGPT, Cursor or Codex write, design and send the email and build the automations too, and it bills by the emails sent, so 10,000 contacts cost $20 a month rather than $60. To send email from an AI agent with Nitrosend, add the MCP server at api.nitrosend.com/mcp to Claude, ChatGPT, Cursor or Codex and sign in with OAuth; a single transactional email sends on the call, and campaigns and flows stay drafts until approved.
Nitrosend vs Selzy, compared
The quick version: eight yes-or-no questions a small 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 Selzy, side by side
Checked September 25, 2026| Question | Nitrosend | Selzy |
|---|---|---|
| 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. | Yes. Yes, through Selzy MCP once direct sending is enabled for the connection, after a confirmation and Selzy moderation. |
| Official MCP serverIs there a first-party MCP server for marketing email? | Yes. Yes. Listed as com.nitrosend/nitrosend on the official MCP registry. | Yes. Yes. Selzy MCP, its own server, not listed on the official MCP registry. |
| Brand from your websiteDoes it learn your fonts, colors and voice from your website? | Yes. Yes. Brand Kit scans the site, including voice. | No. Not described. |
| Rarely emailed contacts are freeCan you keep contacts you rarely email without paying for them? | Yes. Yes. The bill follows emails sent. | No. No. The plan is set by list size. |
| Transactional includedAre receipts and resets in the same plan as newsletters? | Yes. Yes, on every plan including Free. | No. No. Transactional is UniOne, priced separately. |
| Free past 100 contactsCan the free plan hold more than 100 contacts? | Yes. Yes. Unlimited contacts on Free. | No. No. Free covers 100 contacts. |
| Unlimited emails on paid plansCan a paid plan email its list as often as it likes? | Not a yes or no. Plans include a monthly allowance, with extra emails at $0.15 to $0.19 per 100. | Yes. Yes. |
| AI copy and images in the editorDoes the editor generate copy and images? | Yes. Yes. The agent writes and designs from Brand Kit. | Yes. Yes. |
Nitrosend meets 7 of 7 yes-or-no questions on this page, Selzy 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.
Each test, scored
Points out of 100, scores out of 10, September 25, 2026| What we compared | Points | Nitrosend | Selzy |
|---|---|---|---|
| Run from an AI agent | 20 | 9 out of 10 | 7 out of 10 |
| On-brand design, no designer | 10 | 9 out of 10 | 5 out of 10 |
| Cost as the list grows | 20 | 9 out of 10 | 5 out of 10 |
| Free plan headroom | 10 | 7 out of 10 | 3 out of 10 |
| Transactional and marketing, one plan | 10 | 9 out of 10 | 5 out of 10 |
| Hands-on editor and templates | 15 | 6 out of 10 | 7 out of 10 |
| Integrations, support, track record | 15 | 5 out of 10 | 6 out of 10 |
| Total score | 100 | 77.5 out of 100 | 56.5 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 2Selzy
56.5 out of 100Total
- Priced by
- Contacts, unlimited emails
- Free plan
- 100 contacts, 1,000 emails a month
- Entry plan
- Lite, priced by contact tier
- Run from an AI agent7 out of 10Selzy MCP has 42 tools and can send a campaign after a confirmation and Selzy moderation, but lists no automation tools (Selzy).
- On-brand design, no designer5 out of 10AI builder generates copy and visuals from blocks and templates, with no brand import from your site (Selzy).
- Cost as the list grows5 out of 10Priced by contacts: Lite is $60 a month at 10,000, $205 at 50,000, $320 at 100,000 (pricing).
- Free plan headroom3 out of 101,000 emails a month to 100 contacts, after a 14-day trial (pricing).
- Transactional and marketing, one plan5 out of 10Transactional email is UniOne, a sister product priced separately (pricing).
- Hands-on editor and templates7 out of 10Block-based builder with templates and AI, 4.7 of 5 across 34 G2 reviews (G2).
- Integrations, support, track record6 out of 1024/7 support in six languages, plus SMS, chatbots and an email verifier (pricing).
The verdict in short
Both products now hand an AI assistant the controls, which is the clearest sign of where email marketing is going: Selzy's own guide describes an email marketing MCP server as the thing that connects an AI assistant to approved tools and data inside an email platform. The difference is how much of the job the assistant can finish. Selzy MCP covers lists, segments, emails and campaign sends, but its tool list names no automation tools, so the guide gives an assistant no way to set up a welcome series there. Nitrosend's agent builds flows as well as campaigns.
Both products hand an assistant the controls. George Hartley, Nitrosend's co-founder, has a view on it. On DESIGNWAVE in August 2026 he added that relevance cuts both ways: "that might mean not getting an email if, you know, if, if you're not a person who's sort of relevant." In the same interview he was blunt about spam: "it's never been great. And I think, you know, it's, it definitely doesn't, doesn't work that well." Whatever the tool, ask whether your assistant can decide who should and should not get an email.
Selzy is only better on two tests: the hands-on editor, because its block builder with AI copy and images is easy and well reviewed, and support and extras, because 24/7 help in six languages, SMS, chatbots and an email verifier sit alongside it.
At a glance
Nitrosend and Selzy are scored here on the same 7 tests, 100 points in all: Nitrosend 77.5 out of 100, Selzy 56.5 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). Selzy takes its best score on Run from an AI agent and Hands-on editor and templates (7 out of 10) and its lowest on Free plan headroom (3 out of 10). Selzy scores higher on Hands-on editor and templates and Integrations, support, track record. Scores are unadjusted, and every Selzy 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. Selzy prices are the monthly-billing prices its pricing slider shows in US dollars.
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
Selzy prices by contact list size and lets you send unlimited emails. With monthly billing selected its pricing slider showed Lite at $60 a month for 10,000 contacts, $205 for 50,000 and $320 for 100,000 on September 25, 2026, with Standard about half as much again. The page opens on yearly billing and advertises 30% off for the first 12 months, so check which price you are looking at.
Nitrosend charges per email sent, never per contact stored, and every plan includes unlimited contacts. The Nitrosend pricing page has the rates, and what email marketing actually costs compares the two models.
That difference matters more once an agent is doing the work. Selzy MCP can create a list and import contacts from CSV data pasted into the chat, and Selzy's plan is set by contact list size. Reading those two Selzy pages together (an inference, Selzy does not say it in one place), an import an assistant runs can move the account into a higher contact tier. On Nitrosend the same import does not change the bill until the contacts are emailed.
Here is what that looks like for a list that sends two campaigns a month.
What each one costs
List prices, USD, September 25, 2026| Scenario | Nitrosend | Selzy |
|---|---|---|
| 10,000 contacts, two campaigns a month (20,000 emails) | Pro, $20 a month (20,000 emails) | Lite $60 a month, Standard $90 |
| 50,000 contacts, two campaigns a month (100,000 emails) | Ultra, $100 a month (125,000 emails) | Lite $205 a month, Standard $310 |
| 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 | Lite $320 a month, Standard $460 |
| Add transactional email | Counted in the same allowance | Separate UniOne product |
A team that emails its whole list several times a week uses more of Selzy's unlimited sends, and the gap narrows. A new Nitrosend account also 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.
Where Selzy is the better pick
Selzy takes two of the seven tests outright.
- The builder. A drag-and-drop editor made of pre-built blocks, with an AI assistant that writes copy and generates images. Its 34 reviews on G2 average 4.7 out of 5.
- Support and extras. 24/7 support in six languages by email, live chat or phone, plus SMS, chatbots and an email verifier from the same company. Nitrosend has five data integrations and five sending providers, and it is a small team.
Selzy also has a real agent story now. Selzy MCP lists 42 tools, and when direct sending is enabled for the connection it can send or schedule a campaign. Before delivery the campaign is validated, warnings have to be reviewed, the send needs an explicit confirmation, and it still goes through Selzy moderation. Selzy says it has tested the server with Claude and Claude Code.
Where it stops is automation and transactional email. Its tool list names no automation tools, and transactional email is a separate product, UniOne, with its own pricing. On Nitrosend the agent builds a welcome series as a flow with one tool call, and approval, Safe Mode and the all-contacts confirmation are separate checks before anything goes to a whole list. The AI email marketing guide shows the workflow.
Moving from Selzy to Nitrosend
There is no Selzy connector in Nitrosend, so a move runs through an export and the agent.
- Contacts. Export lists from Selzy as CSV with fields, and import them in Contacts or through the imports API. Bring consent status across, because only subscribed contacts should be sendable.
- Emails. Selzy MCP can read and copy existing emails, and Nitrosend's MCP creates templates, so with both servers connected in Claude an assistant can carry the copy of a newsletter across. That pairing is an inference from the two products' docs, not a documented migration path, so check each template before it is used.
- Automations. Selzy MCP's tool list names no automation tools, so open each automation in the Selzy app, describe it to the agent, and it rebuilds it as a draft flow. Check each one before it goes live.
- Transactional. If UniOne sends the app's receipts today, they can move to the Nitrosend API on the same plan as the newsletter. The transactional email section explains how.
- Sending. Verify the domain, then send to the most engaged contacts first and grow from there. The domain warm-up guide covers the ramp.
Which one to pick
Pick Selzy if a person builds each email by hand and likes AI help inside the editor, the team wants 24/7 support in its own language, it emails a small list often enough to use unlimited sends, or it only needs an assistant in Claude to prepare and send one-off campaigns.
Pick Nitrosend if an agent should write, design and send the email and build the automations from the assistant the team already uses, receipts and newsletters belong on one plan and one API, or the list is large relative to how often it is emailed. The Nitrosend MCP server and the ChatGPT app are the two ways most teams start.
Nitrosend vs Selzy FAQ
Add the Nitrosend MCP server at api.nitrosend.com/mcp in Claude (or the official connector under Settings, Connectors) and sign in with OAuth, no API key needed. Then ask for the email. A single transactional email sends on the call; a campaign or flow is saved as a draft and goes out once it is approved. The same server works in ChatGPT, Cursor and Codex.
Yes, at every list size in the table. Selzy Lite is $60 a month at 10,000 contacts, $205 at 50,000 and $320 at 100,000 with monthly billing. Nitrosend charges by emails sent: $20 a month for 20,000 and $100 for 125,000.
Yes. Selzy MCP lists 42 tools for contacts, segments, emails, templates, pre-send checks, campaign statistics and sending, and it can send a campaign after a confirmation and Selzy moderation once direct sending is enabled. Its tool list names no automation tools, and it is not listed on the official MCP registry.
Yes, a small one: 1,000 emails a month to 100 contacts, after a 14-day trial. Nitrosend's Free plan sends 8,000 emails to start, then 500 a month, with unlimited contacts.
Through UniOne, a sister product with its own pricing. Nitrosend sends transactional and marketing email from one plan.
Yes. Export them as CSV with their fields and import them, keeping consent status so only subscribed contacts are sendable.
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.