What is the difference between ConvertKit and Plunk?

ConvertKit is best for Creators and solo businesses who want simple, powerful email, while Plunk is best for Developers wanting open-source transactional email. ConvertKit starts at $25/mo and Plunk starts at Free.

Is ConvertKit or Plunk cheaper?

ConvertKit starts at $25/mo with a free tier. Plunk starts at Free and is free.

Is there a free alternative to Plunk?

Both ConvertKit and Plunk offer free tiers.

ConvertKit vs Plunk

ConvertKit is email marketing platform built for creators — newsletters, automations, and digital products, while Plunk is open-source email platform for transactional and marketing emails with automation. The biggest difference up front: Plunk is free, while ConvertKit starts at $25/mo. ConvertKit is built for creators and solo businesses who want simple, powerful email, whereas Plunk targets developers wanting open-source transactional email.

At a glance

	ConvertKit	Plunk
Best for	Creators and solo businesses who want simple, powerful email	Developers wanting open-source transactional email
Starting price	$25/mo	Free
Free tier	✓	✓
Open source	—	✓
Free tier available	✓	✓
Open source	—	✓
Analytics	—	✓
Automations	✓	✓
Digital Products	✓	—
Landing Pages	✓	—
Open Source	—	✓
Sequences	✓	—
Tagging	✓	—
Transactional	—	✓

ConvertKit

Strengths

Built specifically for creators and solopreneurs
Excellent automation and sequence builder
Built-in landing pages and digital product sales
Tag-based subscriber management (no lists)

Weaknesses

Limited email template design options
More expensive than alternatives for large lists
Reporting is basic
A/B testing is limited

Try ConvertKit → 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: Plunk is completely free, which makes it the obvious pick if budget is the top concern. ConvertKit starts at $25/mo, but Free for up to 1,000 subscribers. That cost buys you a more polished or feature-rich experience, so it comes down to whether the extras justify the spend.

Feature gaps: ConvertKit offers Digital Products, Landing Pages and Sequences that Plunk lacks. Plunk brings Analytics, Open Source and Transactional that ConvertKit does not have. Both share Automations.

Team fit: ConvertKit is geared toward individual users and small setups, while Plunk is aimed at small teams teams. Pick the one that matches where your team is today and where it is headed — migrating tools later is always painful.

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

Where each tool shines: ConvertKit's biggest strengths are: built specifically for creators and solopreneurs. excellent automation and sequence builder. Plunk's biggest strengths are: open source and transparent. open-source codebase gives you full transparency and community-driven development.

Watch out for: With ConvertKit, users commonly note that limited email template design options. With Plunk, the main complaint is that may lack some advanced features.

Choose ConvertKit if...

You need a tool built for creators and solo businesses who want simple, powerful email
You specifically need Digital Products and Landing Pages
You care about excellent automation and sequence builder
Your team size fits the individuals profile ConvertKit is designed for
The free tier works for you: free for up to 1,000 subscribers

Choose Plunk if...

Your profile matches its sweet spot: developers wanting open-source transactional email
Budget is a hard constraint — Plunk is free, ConvertKit is not
You need self-hosting, data sovereignty, or the ability to audit source code
You specifically need Analytics and Open Source
You care about open-source codebase gives you full transparency and community-driven development