MailerSend vs Plunk
MailerSend and Plunk are both popular choices in the transactional email service space. Plunk starts at free versus $6/mo for MailerSend. Both offer free plans to get started. MailerSend stands out with A/B testing and SMS marketing, while Plunk offers marketing automation and audience segmentation.
Quick Verdict
MailerSend wins on rating, integrations.
Plunk wins on price, deliverability.
Best for most users: Plunk (developers).
MailerSend
Developer-friendly transactional email by the MailerLite team
MailerSend is a transactional email service built by the team behind MailerLite, launched in 2020 with over a decade of email deliverability expertise. It offers a polished developer experience with a full API, SMTP relay, drag-and-drop template builder, and SMS capabilities, making it an ideal choice for SaaS and app developers who need reliable transactional email delivery without the complexity of AWS.
Plunk
The open-source email platform
Plunk is an open-source email platform that combines transactional emails, workflow automation, and campaign broadcasts in one tool. Built for developers, it offers a simple API, self-hosting capabilities, and transparent pay-per-email pricing.
Feature Comparison
| Feature | MailerSend | Plunk |
|---|---|---|
| Rating | 4.2/5 | 3.7/5 |
| Starting Price | $6/mo | Free |
| Free Plan | 500 emails/month (100/day max), 1 domain, 1 template | 1,000 emails/month |
| Founded | 2020 | 2023 |
| Email Templates | 90 | 10 |
| Integrations | 29 | 10 |
| Deliverability Rate | 86.8% | 96% |
| Marketing Automation | ✕ | ✓ |
| A/B Testing | ✓ | ✕ |
| Landing Pages | ✕ | ✕ |
| Segmentation | ✕ | ✓ |
| Drag & Drop Editor | ✓ | ✕ |
| SMS Marketing | ✓ | ✕ |
| Ecommerce Features | ✕ | ✕ |
| API Access | ✓ | ✓ |
| Multi-Language | ✕ | ✕ |
| Web Push Notifications | ✕ | ✕ |
| Live Chat | ✓ | ✕ |
| Advanced Analytics | ✓ | ✓ |
MailerSend: Pros & Cons
Pros
- +Excellent developer experience with SDKs for Node.js, Python, Java, Laravel, PHP, Go, and Ruby
- +Strong deliverability averaging 86.8% inbox placement in EmailToolTester third-party tests (2nd best tested)
- +Intuitive drag-and-drop email builder with 90+ pre-built content blocks for quick template creation
- +Built by the MailerLite team with 10+ years of email deliverability expertise behind the platform
- +Includes SMS API for US and Canada on Starter plans and above at no extra base cost
Cons
- −Free plan reduced from 3,000 to just 500 emails/month in October 2025, with 100/day cap
- −No marketing automation or campaign features; purely transactional and lacks segmentation tools
- −Starter and Professional plans both start at $25/month for same 50,000 emails, confusing tier differentiation
- −Some users report sudden account suspensions for high bounce rates with no refunds offered
- −Pricing can become expensive at scale compared to Amazon SES or Elastic Email ($0.90 per 1,000 overage)
Plunk: Pros & Cons
Pros
- +Open-source under AGPL-3.0 with self-hosting option
- +Transparent pricing at $0.001 per email with no contact limits
- +Combines transactional, workflow, and campaign emails in one platform
- +Developer-friendly with REST API, Node.js and Python SDKs
- +Open-source codebase allows self-hosting for full data control
Cons
- −Relatively new platform with smaller user base
- −Limited template library and no visual editor
- −No A/B testing, landing pages, or SMS
- −Community support via Discord rather than dedicated team
- −Early-stage product — feature set is still catching up to competitors
The Verdict
MailerSend edges ahead with a 4.2/5 rating compared to Plunk's 3.7/5. The gap comes mainly from support (4.7 vs 3.4) and feature depth (4.3 vs 3.2). On deliverability, Plunk reports 96% compared to 86.8% for MailerSend — a meaningful difference if inbox placement is critical for your campaigns.
| Criterion | Weight | MailerSend | Plunk |
|---|---|---|---|
| Starting Price | 30% | $6/mo | Free |
| Deliverability | 25% | 86.8% | 96% |
| Rating | 25% | 4.2/5 | 3.7/5 |
| Integrations | 10% | 29 | 10 |
| Free Tier | 10% | Yes | Yes |
Weights determine how much each criterion counts toward the final score. See full methodology
Choose MailerSend if…
- + You need SMS marketing
- + You need A/B testing
- + You're a developers building transactional email flows
- + You're a saas companies sending password resets and notifications
Choose Plunk if…
- + You want lower starting costs (Free)
- + You need marketing automation
- + You're a developers
- + You're a startups