Mailgun vs Plunk
Mailgun and Plunk are both popular choices in the transactional email service space. Mailgun has been around since 2010, giving it a 13-year head start over Plunk (founded 2023). Plunk is the more affordable option at $1/mo — that's $14 less per month than Mailgun's $15/mo entry point. Both offer free plans to get started. Plunk has the edge with marketing automation, audience segmentation. Both tools work well for developers.
Quick Verdict
Mailgun wins on deliverability, rating, integrations.
Plunk wins on price.
Best for most users: Mailgun (developers).
Mailgun
Developer-focused transactional email API by Sinch
Mailgun is a Sinch-owned transactional email API platform founded in 2010, designed for developers who need reliable, high-volume email delivery via REST API or SMTP. It offers email validation, inbox placement testing, and send-time optimization, making it a solid choice for SaaS companies and engineering teams building custom email workflows.
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 | Mailgun | Plunk |
|---|---|---|
| Rating | 4.2/5 | 3.7/5 |
| Starting Price | $15/mo | $1/mo |
| Free Plan | 100 emails/day (~3,000/month), 1 domain, 1-day logs | 1,000 emails/month |
| Founded | 2010 | 2023 |
| Email Templates | 25 | 10 |
| Integrations | 40 | 10 |
| Deliverability Rate | 97% | 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 | ✓ | ✓ |
Mailgun: Pros & Cons
Pros
- +Powerful RESTful API with well-structured SDKs for Python, Ruby, Node.js and more, making integration painless for developers
- +Real-time dashboards for delivery, bounce, spam complaints, and click rates provide clear campaign health visibility
- +Handles very high email volumes reliably with strong deliverability and fast sending speeds
- +Built-in email validation and inbox placement testing tools (Mailgun Optimize) for deliverability optimization
- +Flexible routing rules, webhooks, and event tracking simplify debugging and monitoring email performance
Cons
- −Pricing escalates quickly at higher volumes and premium features like dedicated IPs ($59/mo) and validations cost extra
- −No built-in drag-and-drop email editor or marketing automation features — purely developer-focused
- −Setup requires technical knowledge; non-developers will struggle with DNS configuration and API integration
- −UI dashboard feels outdated in certain sections compared to modern competitors like Resend
- −Lower-tier plans use shared IP addresses which can impact deliverability if other senders have poor practices
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
Mailgun edges ahead with a 4.2/5 rating compared to Plunk's 3.7/5. The gap comes mainly from deliverability (4.5 vs 3.5) and support (4.1 vs 3.4). On deliverability, Mailgun reports 97% compared to 96% for Plunk — a meaningful difference if inbox placement is critical for your campaigns.
| Criterion | Weight | Mailgun | Plunk |
|---|---|---|---|
| Starting Price | 30% | $15/mo | $1/mo |
| Deliverability | 25% | 97% | 96% |
| Rating | 25% | 4.2/5 | 3.7/5 |
| Integrations | 10% | 40 | 10 |
| Free Tier | 10% | Yes | Yes |
Weights determine how much each criterion counts toward the final score. See full methodology
Choose Mailgun if…
- + You're a saas companies
- + You're a high volume transactional senders
- + Powerful RESTful API with well-structured SDKs for Python, Ruby, Node.js and more, making integration painless for developers
Choose Plunk if…
- + You want lower starting costs ($1/mo)
- + You need marketing automation
- + You're a startups
- + You're a SaaS companies