Quick answer
Emitlo - Emitlo wins for most builders because its free tier is much closer to the paid product and is easier to keep using as volume grows, while AgentMail is better only if you specifically need inbox management for AI agents rather than sending email.
How the free tiers compare
These are both free-tier email products, but they solve different problems. AgentMail is an inbox API for AI agents, so the free plan is about managing inboxes, threads, replies, attachments, semantic search, and extraction. The tradeoff is tight caps: 3 inboxes, 3,000 emails per month, and limited storage, webhooks, and team access. Emitlo is a delivery service for transactional and marketing email, and its free plan is broader in practical use: 12,000 emails per month for early signups, plus daily and hourly limits, domains, credentials, analytics, events, and webhooks. If you need sending infrastructure, Emitlo is the more complete free starting point. If you need programmatic inboxes for agent workflows, AgentMail fits that niche better.
AgentMail vs Emitlo free tier, side by side
| AgentMailFTV 47 | EmitloFTV 51 | |
|---|---|---|
| Free emails per monthAgentMail is capped on inbox email volume; Emitlo gives more sending volume on free. | 3,000 | 12,000 for early signups |
| Inboxes / sending domainsThese are different units, but both constrain how much infrastructure you can set up. | 3 inboxes | 3 sending domains |
| Team members / credentialsAgentMail limits collaborators; Emitlo limits access credentials for sending. | 2 team members | 3 API/SMTP credentials |
| Storage / log historyAgentMail stores inbox data; Emitlo focuses on shorter retention in the free tier. | 3 GB storage | 14 days of log history |
| WebhooksEmitlo includes webhooks but does not specify a free-tier endpoint count in the provided data. | 2 webhook endpoints | Webhooks included |
After you outgrow the free tier
AgentMail uses flat paid tiers after free, starting at $20/month for Developer and then $200/month for Startup, with Enterprise as custom contact sales pricing. Emitlo uses usage-based pricing at $0.15 per 1,000 emails, with no tiers or commitments on the first paid plan. That means AgentMail’s costs jump in discrete steps when you outgrow a tier, while Emitlo scales gradually with volume. For small teams, AgentMail is cheaper only if you stay within the free tier or need a fixed bundle; Emitlo is cheaper and more predictable for low-volume sending, but its bill rises directly with usage.
Cost at real usage
| Usage | AgentMail | Emitlo |
|---|---|---|
| 12,000 emails/moEmitlo's free plan already includes 12,000 emails/mo for early signups, but the paid rate at this volume is still $1.80. | $20/mo | $1.80/mo |
| 50,000 emails/moAgentMail would require the Startup tier once you need more than 10,000 emails/mo. | $200/mo | $7.50/mo |
| 150,000 emails/moAgentMail's Startup tier includes 150,000 emails/mo; Emitlo stays usage-based. | $200/mo | $22.50/mo |
| 500,000 emails/moAgentMail Enterprise is custom and includes usage-based pricing, so no exact price was provided. | contact sales / varies by usage | $75.00/mo |
Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.
When to pick each one
Pick AgentMail when…
- You need programmatic inbox creation and management for AI agents.
- Your workflow depends on reading, replying to, and extracting data from inbound email threads.
- You only need a small number of inboxes, not a sending platform.
- You want REST APIs, SDKs, webhooks, and MCP support centered on inbox operations.
Pick Emitlo when…
- You need a transactional or marketing email delivery service.
- You want to send more than a few thousand emails per month on the free tier.
- You need REST API or SMTP relay delivery with DKIM, SPF, and DMARC already included.
- You care about analytics, delivery event tracking, and webhooks as part of sending infrastructure.
- You want a free plan that stays useful while you test real email volume and domains.
Bottom line
For the most common builder choice, Emitlo is the better free-tier pick because it gives you a real sending stack, more free volume, and a smooth path into paid usage without a big step up. AgentMail only wins if your product is specifically about inbox automation for agents, where inbox management matters more than delivery infrastructure. If you are testing email sending, integration, or basic production workflows, Emitlo is the easier place to start and the easier one to keep paying for later.
Read the full listings: AgentMail and Emitlo. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.