Head-to-head · Email APIs
Maileroo vs OpenSend
Maileroo leads on 1 check, OpenSend on 0, and 5 are even. Who comes out ahead on the 6 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreMaileroo · 7.9/10
- Free planboth
- Most featuresMaileroo · 5 of 5
Maileroo scores higher on our rubric for email apis: 7.9 against 6.8 out of 10; our editors rank them #11 and #19.
Maileroo offers smtp relay; OpenSend doesn't.
Maileroo is the better fit for high-volume senders on a low-cost plan. OpenSend is the better fit for open-source teams wanting a modern email stack.
- Maileroo fits best
High-volume senders on a low-cost plan
- OpenSend fits best
Open-source teams wanting a modern email stack
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Side by side
| Feature | Maileroo 7.9/10 Visit ↗ | OpenSend 6.8/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 7.9 | 6.8 |
| Ranking | #11 in Email APIs | #19 in Email APIs |
| Best for | High-volume senders on a low-cost plan | Open-source teams wanting a modern email stack |
| Pricing model | Free plan + paid | Free plan + paid |
| Starting price | — | $10/mo |
| Free plan | ✓ | ✓ |
| Free trial | — | — |
| Deployment | Cloud | Cloud, Self-hosted |
| Platforms | Web | Web |
| Integrations | 3 integrations | 8 integrations |
| Features Maileroo 5/5 · OpenSend 4/5 | ||
| Inbound email | ✓ | ✓ |
| Delivery event webhooks | ✓ | ✓ |
| SMTP relay | ✓ (best) | — |
| Email templates | ✓ | ✓ |
| Dedicated IP option | ✓ | ✓ |
| Specs | ||
| Monthly send limit | Not checked yet | 15000 /mo |
| Our review | ||
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| Our verdict | Maileroo is an email delivery platform for developers, startups, agencies and enterprises that need transactional, bulk or scheduled email delivery. It combines a RESTful email API with SMTP relay, inbound email routing, reusable… Read the review → |
OpenSend is email infrastructure for developers and teams managing transactional email, broadcasts, contacts, templates, automations, inbound messages, and delivery events. It supports web access, an API, and self-hosted deployment. Its… Read the review → |
Strengths and trade-offs
Maileroo — where it wins
- Free plan includes 3,000 outbound and 1,000 inbound emails monthly
- REST API, SMTP relay, inbound routing and delivery webhooks
- Supports WordPress, major languages and dedicated-IP options
Where it doesn't
- Free plan includes only 2 domains
- Paid SMTP plan is limited to 25,000 emails per month
- The paid offering is presented primarily around SMTP sending
OpenSend — where it wins
- Self-hosting with Docker Compose, AWS SES, and Postgres
- Resend-compatible REST API with TypeScript SDK and React Email support
- Webhooks, inbound routes, automations, templates, and domain authentication
Where it doesn't
- SMTP relay is not supplied
- Self-hosting requires AWS SES and Postgres
- The Free plan allows 500 API and broadcast emails monthly
- Maileroo7.9/10 · Free plan
A low-cost email API with inbound routing, webhooks, templates and SMTP relay.
Visit MailerooFull verdict → - OpenSend6.8/10 · Free plan
A flexible email stack for developers, with self-hosting and a Resend-compatible API.
Visit OpenSendFull verdict →
All email APIs comparisons → · Full ranking →
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update