Who is Primitive for?

Developers building AI agents that need their own email address for sending and receiving mail

How much does Primitive cost?

Primitive has a free plan; paid plans start at $13/mo, per its pricing page on 2026-10-20.

Yes, Primitive has a free plan, per its pricing page on 2026-10-20.

Do people use Primitive?

Widely used: ≈ 8 visits/mo · estimate, 2026-10 · 139k installs/mo (npm).

Is Primitive still maintained?

Actively maintained: release 8 days ago · site updated 7 days ago.

Primitive is run by Second Stage Labs, Inc., per its privacy policy (2026-10-20).

We do not audit vendors. What Primitive publishes, read 2026-10-20: a trust center.

Does Primitive give refunds?

In its own words (terms of service, 2026-10-20): “Fees are non-refundable except where required by law.”

What are alternatives to Primitive?

In Agents, by use: Gumloop, OpenClaw, Sierra, Twin, Atomic Bot, Robotomail.

Primitive

Provides email sending and receiving over HTTP for AI agents, with managed addresses running JavaScript handlers on inbound mail.

Free plan · From $13/moActively maintained

AgentsFor developers

primitive.dev ↗Crunchbase Wikidata LinkedIn GitHub X+3

Open primitive.devAlternatives Set it up for my team Is Primitive yours? Claim the card →

At a glanceswept Oct 15, 2026

≈ 8visits/mo

Widely used · estimate, read Oct 15, 2026

Primitive8
#1 PolyAI392k

For: Developers building AI agents that need their own email address for sending and receiving mail
Price: Free plan · From $13/mopricing page, read Oct 20, 2026
Activity: Actively maintainedrelease 8 days ago · site updated 7 days ago
Company: Second Stage Labs, Inc. · since 2026privacy policy · per Wikidata
Runs as: API
Used for: Send transactional email from a custom domain
Run custom logic on every inbound message
Exchange threaded replies between agents over email
read off primitive.dev on Oct 20, 2026

Worth knowingcomputed from what we read · each with its source

138,937 installs a month on npmpublic registry
Has an MCP server (1 in the registry)public registry →
Publishes llms.txt, a file written for AI assistantsprimitive.dev ↗

Pricingpricing page, read Oct 20, 2026

Free plan · From $13/mo

pricing page

The companyeach fact with its source · read Oct 20, 2026

Founded2026per Wikidata
Domain since2020domain registered
Raised$9M · Series Aper the press · 2022-08 ↗
HeadquartersSan Franciscoper Wikidata
Industryemailper Wikidata

Your datawhat they publish, each line with its page · read Oct 20, 2026

Run bySecond Stage Labs, Inc.privacy policy ↗
Trust centertheir owntrust center ↗
Privacy policy updated2026-05-03privacy policy ↗
Security contactsecurity.txt

These are Primitive's own statements, read from its pages. We did not audit them. A line that is missing was not found on the pages we read; it does not mean the practice is absent.

How a program reaches itfound, not claimed · read Oct 20, 2026

MCP serverdev.primitive/emailverified in the MCP registry
Stateanswers, 14 toolschecked 2026-10-20
Address to connectwww.primitive.dev/mcp
OpenAPI spec151 pathsthe spec ↗
API docsdocs.primitive.dev/docs/apithe vendor's page ↗
MCP docsdocs.primitive.dev/docs/connectorsthe vendor's page ↗

MCP server details →

This card as JSON, for your agent →

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.

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Figure and bar: visits/mo, estimate · year: online since

#1
Gumloop
Builds and deploys autonomous agents that automate business tasks like sales pipeline management, prospect research, and CRM updates.
372k
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From $37/mo
#2
OpenClaw
Open source AI assistant that manages email, calendar, and tasks from chat apps without subscriptions.
182k
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#3
Sierra
Runs customer service agents for brands that answer and resolve customer conversations across chat, SMS, email and phone.
11.9k
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2023
#4
Twin
Builds autonomous agents that run business processes like lead generation, content creation, and outreach in Slack and email.
2.5k
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#5
Atomic Bot
Runs AI agents in the cloud continuously, handling tasks across email, calendar, code, and messaging apps.
824
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From $19/mo
#6
Robotomail
Provides real email addresses and mailboxes for AI agents to send and receive messages via API.
464
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All 10 alternatives to Primitive →

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Three tools from the Atlas for the job you describe, each with what fits and what does not.

From people who use itnot part of the reading

No notes yet. What do you use Primitive for?

Questions this page answers

What is Primitive?
Provides email sending and receiving over HTTP for AI agents, with managed addresses running JavaScript handlers on inbound mail. It is listed in the Atlas under Agents and made by Second Stage Labs, Inc.
Who is Primitive for?
Developers building AI agents that need their own email address for sending and receiving mail
How much does Primitive cost?
Primitive has a free plan; paid plans start at $13/mo, per its pricing page on 2026-10-20.
Is Primitive free?
Yes, Primitive has a free plan, per its pricing page on 2026-10-20.
Do people use Primitive?
Widely used: ≈ 8 visits/mo · estimate, 2026-10 · 139k installs/mo (npm).

Is Primitive still maintained?
Actively maintained: release 8 days ago · site updated 7 days ago.
Who owns Primitive?
Primitive is run by Second Stage Labs, Inc., per its privacy policy (2026-10-20).
Is Primitive safe?
We do not audit vendors. What Primitive publishes, read 2026-10-20: a trust center.
Does Primitive give refunds?
In its own words (terms of service, 2026-10-20): “Fees are non-refundable except where required by law.”
What are alternatives to Primitive?
In Agents, by use: Gumloop, OpenClaw, Sierra, Twin, Atomic Bot, Robotomail.

How we read a tool

No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.

Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.

How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.

How we read every tool → · By INITE Atlas Desk