What is the difference between Loops and Plunk?

Loops is best for SaaS companies wanting email for product-led growth, while Plunk is best for Developers wanting open-source transactional email. Loops starts at Free and Plunk starts at Free.

Is Loops or Plunk cheaper?

Loops starts at Free with a free tier. Plunk starts at Free and is free.

Is there a free alternative to Plunk?

Both Loops and Plunk offer free tiers.

Loops vs Plunk

Loops is email platform built for SaaS with event-triggered emails and in-app messaging, while Plunk is open-source email platform for transactional and marketing emails with automation. Plunk is open source and can be self-hosted, giving you full control over your data. Loops is built for saas companies wanting email for product-led growth, whereas Plunk targets developers wanting open-source transactional email.

At a glance

	Loops	Plunk
Best for	SaaS companies wanting email for product-led growth	Developers wanting open-source transactional email
Starting price	Free	Free
Free tier	✓	✓
Open source	—	✓
Free tier available	✓	✓
Open source	—	✓
Analytics	✓	✓
Automations	—	✓
Event Triggers	✓	—
Loops	✓	—
Open Source	—	✓
Segmentation	✓	—
Transactional	—	✓

Loops

Strengths

Includes Event Triggers as a core feature, purpose-built for email marketing workflows
Includes Loops as a core feature, purpose-built for email marketing workflows
Free for 1K contacts — generous enough for most small teams to get real work done
Includes segmentation alongside the core feature set — fewer separate tools needed

Weaknesses

Free plan exists but key features are locked behind the paid upgrade
Fewer built-in features means you may need additional tools to cover gaps
Deliverability depends on your sender reputation, which takes time to build
Limited team/admin features if your organization eventually scales up

Try Loops → Full review

Plunk

Strengths

Open source and transparent
Open-source codebase gives you full transparency and community-driven development
Fully open-source — you can self-host, audit the code, and avoid vendor lock-in
The core product is free with no paywalled essentials

Weaknesses

May lack some advanced features
Self-hosting is free but requires server maintenance and DevOps knowledge
Fewer built-in features means you may need additional tools to cover gaps
Deliverability depends on your sender reputation, which takes time to build

Try Plunk → Full review

The bottom line

Pricing: Both Loops and Plunk are free. You can try both without spending a dollar.

Feature gaps: Loops offers Event Triggers, Loops and Segmentation that Plunk lacks. Plunk brings Automations, Open Source and Transactional that Loops does not have. Both share Analytics.

Team fit: Both tools target small teams teams, so the decision hinges on features and workflow fit rather than scale.

Open source: Plunk is open source, meaning you can self-host, audit the code, and avoid vendor lock-in. Loops is proprietary — you are trusting the vendor with your data and uptime.

Where each tool shines: Loops's biggest strengths are: includes event triggers as a core feature, purpose-built for email marketing workflows. includes loops as a core feature, purpose-built for email marketing workflows. Plunk's biggest strengths are: open source and transparent. open-source codebase gives you full transparency and community-driven development.

Watch out for: With Loops, users commonly note that free plan exists but key features are locked behind the paid upgrade. With Plunk, the main complaint is that may lack some advanced features.

Choose Loops if...

You need a tool built for saas companies wanting email for product-led growth
You specifically need Event Triggers and Loops
You care about includes loops as a core feature, purpose-built for email marketing workflows
The free tier works for you: free for 1k contacts

Choose Plunk if...

Your profile matches its sweet spot: developers wanting open-source transactional email
You need self-hosting, data sovereignty, or the ability to audit source code
You specifically need Automations and Open Source
You care about open-source codebase gives you full transparency and community-driven development