kitio.aiAgentMail vs Fastn
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. AgentMail starts at $20/mo and Fastn starts at See pricing page. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Inboxes created by API
- Threaded send and receive
- Attachments
- Webhooks and events
- Custom domains
- Per-agent permissions
- Embedded integrations
- Unified API
- MCP gateway
- Integration agents
- Visual and code workflows
- Self-hosting
| Feature | AgentMail | Fastn |
|---|---|---|
| Best for | Email inbox API that gives AI agents their own addresses | Embedded integration layer for SaaS products and AI agents |
| Category | Agents & automation | Agents & automation |
| Pricing model | Freemium | Freemium |
| Starting price | $20/mo | See pricing page |
| Free plan | Yes | Yes |
| Made by | AgentMail | Fastn |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
AgentMail starts at $20/mo and Fastn starts at See pricing page. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Free
Free
- 3 inboxes
- 3,000 emails a month
- 1 custom domain
- 3 GB storage
Developer
$20/mo
- 10 inboxes
- 10,000 emails a month
- 10 custom domains
- Email support
Startup
$200/mo
- 150 inboxes
- 150 custom domains
- 10 organization seats
- SOC 2 report
Enterprise
Contact sales
- Bring-your-own-cloud deployment
- Dedicated IPs
- OIDC and SAML SSO
2 plans
Launch
Free
- 3 customer connections
- Unlimited connectors and workflows
- 50 AI credits a month
Scale
$500/mo billed yearly
- 10 connections, then $50 each
- 1,000 AI credits a month
- Dashboards and alerts
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
AgentMail
- Free tier with three inboxes
- Python and TypeScript SDKs plus MCP
- Custom domains with DKIM, SPF and DMARC
- Free plan capped at 100 emails a day
- SOC 2 report only on Startup and up
- Dedicated IPs require Enterprise
Fastn
- Priced by customer connection
- Free plan, no card needed
- Works with Claude, Cursor and MCP clients
- Costs rise as customer connections grow
- Aimed at SaaS vendors, not end users
- Annual billing gives the lowest listed rate
Which one should you choose?
Choose AgentMail if you want:
- Free tier with three inboxes
- Python and TypeScript SDKs plus MCP
- Custom domains with DKIM, SPF and DMARC
Watch out: free plan capped at 100 emails a day.
Choose Fastn if you want:
- Priced by customer connection
- Free plan, no card needed
- Works with Claude, Cursor and MCP clients
Watch out: costs rise as customer connections grow.
AgentMail vs Fastn FAQ
What is the difference between AgentMail and Fastn?
AgentMail: Email inbox API that gives AI agents their own addresses. Fastn: Embedded integration layer for SaaS products and AI agents. Both are agents & automation tools.
Is AgentMail or Fastn cheaper?
AgentMail starts at $20/mo and Fastn starts at See pricing page. Check both pricing pages for current plans.
Do AgentMail and Fastn have free plans?
AgentMail: Yes. Fastn: Yes.
Who makes AgentMail?
AgentMail is made by AgentMail.
Who makes Fastn?
Fastn is made by Fastn.
Which should I choose, AgentMail or Fastn?
Choose AgentMail if you value free tier with three inboxes and python and typescript sdks plus mcp. Choose Fastn if you value priced by customer connection and free plan, no card needed.