kitio.aiClaude Agent SDK vs AgentMail
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Claude Agent SDK is completely free, while AgentMail is freemium.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Claude Code agent loop
- Built-in file and shell tools
- Hooks and permissions
- Subagents and skills
- MCP support
- Inboxes created by API
- Threaded send and receive
- Attachments
- Webhooks and events
- Custom domains
- Per-agent permissions
| Feature | Claude Agent SDK | AgentMail |
|---|---|---|
| Best for | Anthropic's SDK for building agents on the Claude Code harness | Email inbox API that gives AI agents their own addresses |
| Category | Agents & automation | Agents & automation |
| Pricing model | Free | Freemium |
| Starting price | Free | $20/mo |
| Free plan | Yes, fully free | Yes |
| Made by | Anthropic | AgentMail |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Claude Agent SDK is completely free, while AgentMail is freemium.
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
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Claude Agent SDK
- Proven harness from Claude Code
- Strong for long, tool-heavy tasks
- Fine-grained permission control
- Requires API billing
- Mostly tied to Claude models
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
Which one should you choose?
Choose Claude Agent SDK if you want:
- Proven harness from Claude Code
- Strong for long, tool-heavy tasks
- Fine-grained permission control
Watch out: requires api billing.
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.
Claude Agent SDK vs AgentMail FAQ
What is the difference between Claude Agent SDK and AgentMail?
Claude Agent SDK: Anthropic's SDK for building agents on the Claude Code harness. AgentMail: Email inbox API that gives AI agents their own addresses. Both are agents & automation tools.
Is Claude Agent SDK or AgentMail cheaper?
Claude Agent SDK is completely free, while AgentMail is freemium.
Do Claude Agent SDK and AgentMail have free plans?
Claude Agent SDK: Yes, fully free. AgentMail: Yes.
Who makes Claude Agent SDK?
Claude Agent SDK is made by Anthropic, based in United States.
Who makes AgentMail?
AgentMail is made by AgentMail.
Which should I choose, Claude Agent SDK or AgentMail?
Choose Claude Agent SDK if you value proven harness from claude code and strong for long, tool-heavy tasks. Choose AgentMail if you value free tier with three inboxes and python and typescript sdks plus mcp.