Quick answer
Maileroo - Maileroo wins for most builders who want to send real email from a free tier, because it gives more outbound headroom, no card requirement, and includes the core delivery features you are likely to keep using as you grow.
How the free tiers compare
These two free tiers solve different problems. Maileroo is the better fit if you want a lightweight sending stack for a product, website, or small campaign flow and you care about getting started without a card. Its free plan is centered on outbound delivery and gives you SMTP, REST API, webhooks, tracking, inbound routing, and verification, with enough monthly volume for a small sender. Mailtrap’s free tier is narrower and more constrained: it is split around sending and sandboxing, but the sending cap is 4,000 emails per month with only 150 per day, 1 user, 1 domain, 3 days of logs, and 100 contacts. Mailtrap is more attractive if testing and QA are the main job, or if you need its sandbox workflow. After free, both start at $15/month, but Mailtrap climbs faster once you need higher volume and retention.
Maileroo vs Mailtrap free tier, side by side
| MailerooFTV 64 | MailtrapFTV 37 | |
|---|---|---|
| Outbound email volumeMaileroo does not list a per-day cap in the provided data; Mailtrap does. | Up to 3,000 emails/month | 4,000 emails/month |
| Daily sending capThis makes Mailtrap’s free tier less suitable for bursty sending. | Not specified | 150 emails/day |
| Inbound email volumeMaileroo includes inbound routing on free tier. | 1,000 inbound emails | Not specified |
| UsersMailtrap clearly limits the free plan to one user. | Not specified | 1 user account |
| DomainsMailtrap explicitly includes one domain on free. | Not specified | 1 domain included |
| Email log retentionMaileroo keeps more message history on the free tier. | 14 days | 3 days |
| Sandbox / testingMailtrap is the more test-focused product. | Sandbox domain access | 1 sandbox included; 10 emails per sandbox; 50 test emails/month |
After you outgrow the free tier
Both products start their paid journey at $15/month, but the shape differs after that. Maileroo’s first paid plan is Starter at a flat $15/month with 5,000 emails/month and added campaign and automation features. Mailtrap’s first paid plan is Basic at $15/month with 10,000 emails/month, 3 users, 5 domains, and 5 days of logs. From there, Mailtrap adds clearly stepped higher tiers at $85, $200, $300, $450, and $750/month as volume, domains, users, and log retention increase. Maileroo’s provided pricing only shows one flat starter tier and a custom sales plan, so the exact cost curve beyond $15 is not specified here.
Cost at real usage
| Usage | Maileroo | Mailtrap |
|---|---|---|
| 5,000 emails/monthMaileroo’s Starter tier matches this volume exactly; Mailtrap’s free tier is capped at 4,000/month. | $15/mo | Not on free tier; next paid is $15/mo Basic |
| 10,000 emails/monthMailtrap’s Basic tier starts at 10,000/month. | Custom / contact sales | $15/mo |
| 100,000 emails/monthMailtrap’s Business tier lists 100,000/month. | Custom / contact sales | $85/mo |
| 250,000 emails/monthMailtrap’s Business tier lists 250,000/month. | Custom / contact sales | $200/mo |
Estimates, not quotes. Usage-based rates change - verify with the vendor's pricing page before committing.
When to pick each one
Pick Maileroo when…
- You want to send transactional email from an app or website and need SMTP plus REST API access on day one.
- You do not want to add a credit card before testing a real sending workflow.
- You need more monthly outbound headroom than Mailtrap’s free daily and monthly caps allow.
- You care about delivery-side extras like webhooks, bounce handling, complaint handling, suppression lists, and tracking in the free tier.
- You want inbound routing and email verification included without moving off the free plan.
Pick Mailtrap when…
- You are mainly testing emails in staging, dev, or QA and want a sandbox-style workflow.
- You need to inspect email content and headers without sending to real recipients.
- You are okay with a free plan that includes only 1 user, 1 domain, 3 days of logs, and 100 contacts.
- You want to try a sending product with a low monthly cap before deciding whether to pay.
- You plan to stay at a small scale but care more about sandboxing than marketing or inbound features.
Bottom line
For the most common builder use case, Maileroo is the better free-tier pick because it is easier to use as a real sending tool right away: no card required, more generous outbound headroom, and a broader set of delivery features in the free plan. Mailtrap makes more sense if your immediate need is email testing and QA rather than sending. If you expect to outgrow free quickly, both start at $15/month, but Mailtrap’s paid ladder is clearer in the data provided.
Read the full listings: Maileroo and Mailtrap. Scores use the FTV methodology at /ftv. Browse more head-to-heads on /compare, or see the top-ranked free tiers on /top.