AISend vs MailerSend
A MailerSend Alternative with a Resend-Compatible API
MailerSend is a transactional email service with a drag-and-drop template builder, inbound routing, SMS and an email-verification add-on, with a free plan and plans from $7 a month. AISend is a newer, narrower option: a transactional-only API that accepts Resend's request format. This page compares the two using MailerSend's own plan table, read on October 30, 2026, and says where MailerSend is the better choice. AISend is for transactional and consented mail, and sending requires a verified domain.
Why Developers Switch from MailerSend
- MailerSend's own request body is different from Resend's (from and to are objects, personalization is a separate array), so code written for Resend needs a payload mapping; AISend accepts Resend's format
- At the 50,000-email tier MailerSend's Starter plan is $35 a month in its plan table; AISend Pro is $14 a month for 50,000 emails, with a 2,500-a-day cap
- MailerSend meters its plans partly in daily API requests (100 on Free, 1,000 on Hobby, 100,000 on Starter); AISend's caps are in emails per day
AISend vs MailerSend — Feature Comparison
| Feature | AISend | MailerSend |
|---|---|---|
| Free / trial | 3-day trial: 500 emails, no card, 1 verified domain | Free plan: 1 domain, 1 template, 100 daily API requests; 14-day Professional trial with 500 emails a month |
| Cheapest paid plan | Pro: $14/mo for 50,000 emails | Hobby: $7/mo flat (see their pricing page for the volume it covers) |
| 50,000 emails/month | $14/mo (Pro, 2,500/day cap) | Starter: $35/mo at the 50K tier |
| 100,000 emails/month | $63/mo (Business, 5,000/day cap) | Starter: $68/mo at the 100K tier |
| Sending domains | 1 during the trial; 10 on Pro; no cap on Business | 1 on Free and Hobby; 10 on Starter; no limit listed on Professional |
| Templates and builder | None; you send HTML or text | Drag-and-drop email builder; 1 template on Free, 10 on Hobby, 250 on Starter |
| Email verification | 100 validations on the trial, 5,000 on Pro, 25,000 on Business | Add-on credits, from $10 for 1,000 |
| Inbound email and SMS | No | Inbound routing on every plan; SMS API on Starter and above (USA and Canada) |
| MCP server for AI agents | Local stdio server (aisend-mcp on npm); no hosted endpoint | MCP server listed on every plan (see their docs for how it runs) |
| Resend-compatible request format | Yes: change the base URL and key | No |
Where MailerSend Is the Better Choice
- A $7-a-month Hobby plan and a permanent free plan; AISend has only a 3-day trial
- A template builder, inbound routing, bulk emailing on Hobby and above, and an SMS API on Starter and above; AISend only sends transactional email
- Higher volumes: MailerSend lists tiers up to 2 million emails a month on Professional, while AISend is capped at 5,000 emails a day today
- Add-on email verification credits for large lists, and DMARC monitoring on Starter and above
- An established product: AISend is newer and has no long shared-IP history
MailerSend facts checked October 30, 2026 against MailerSend pricing and MailerSend send-email API reference. Recheck before you buy — providers change their plans.
How to Switch from MailerSend to AISend
- 1Start a 3-day AISend trial (500 emails, no credit card) and create an API key
- 2Add and verify your sending domain — one domain is included during the trial
- 3Map MailerSend's request body to AISend's: from and to objects become plain strings, and personalization data is applied in your own code before you send html
- 4Rebuild templates as HTML in your app, since AISend has no hosted template builder
- 5Point AISend's webhooks at your app, then move a small share of traffic before switching fully
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