Open-source alternative
for Klaviyo
Klaviyo is powerful for e-commerce but extremely expensive. Plunk delivers the same email automation, including full e-commerce support, at a fraction of the cost. No hidden fees, no contact-based pricing.
E-commerce Email Without the Premium Price
Pay for emails sent, not contacts stored
Pay per email sent
Pay-as-you-go pricing. Only pay for emails sent, not contacts stored. Predictable costs as you scale.
Contact-based tiers
Expensive pricing based on contact count. Costs escalate quickly as your list grows.
E-commerce Email, Developer-Friendly
Affordable Pricing
Pay-as-you-go instead of expensive contact-based tiers. Save 60-90% compared to Klaviyo while getting the same email automation power.
E-commerce Ready
Handle order confirmations, shipping notifications, abandoned carts, and product campaigns. All e-commerce email use cases via flexible API.
Developer-Friendly
Modern API designed for developers. Integrate with Shopify, WooCommerce, or any e-commerce platform via webhooks and API calls.
Open Source
AGPL-3.0 licensed. Full transparency into how your emails work. No black-box algorithms or proprietary systems. Klaviyo is closed-source.
Self-Hostable
Run on your infrastructure with Docker. Full data ownership, compliance control, cost optimization at scale. Klaviyo is cloud-only.
Simple Integration
Connect your store via webhooks or API. No complex Shopify app to configure. Build exactly the integration you need with full control.
Feature Comparison
Frequently asked questions
When should I choose Klaviyo over Plunk?
Choose Klaviyo if you need deep native e-commerce integrations (Shopify, WooCommerce), SMS marketing, and AI-powered predictive analytics. Klaviyo excels for established e-commerce brands with dedicated marketing teams and budget for enterprise features. Choose Plunk if you need powerful email automation for e-commerce (or any use case) without the premium price tag. It is built for developers and growing businesses who want the capabilities without the cost.
How much cheaper is Plunk compared to Klaviyo?
Klaviyo can be dramatically more expensive. With 10,000 contacts, Klaviyo costs $150-300+/month depending on email volume. Plunk uses pay-as-you-go pricing. You only pay for emails sent, not contacts stored. For most use cases, Plunk costs 60-90% less than Klaviyo while providing the same email automation capabilities. The savings increase as your contact list grows.
Can Plunk handle e-commerce emails?
Yes. Plunk supports all e-commerce email use cases: transactional emails (order confirmations, shipping notifications), marketing campaigns (product launches, sales), and automated workflows (abandoned cart, post-purchase sequences). You integrate via API instead of native Shopify plugins, which gives you more flexibility and control over your email logic.
Does Plunk integrate with Shopify like Klaviyo?
Plunk integrates with Shopify and other e-commerce platforms via API. While Klaviyo offers a native Shopify app with pre-built flows, Plunk gives you more control by letting you build exactly the integration you need. You can use webhooks, our API, or build custom integrations. This approach is more flexible but requires development work.
What Klaviyo features does Plunk not have?
Plunk focuses on email, so it doesn't include Klaviyo's SMS marketing, native e-commerce platform integrations, AI-powered product recommendations, or predictive analytics. If you need those enterprise features and have the budget, Klaviyo is better. If you want powerful email automation at a fraction of the cost, Plunk delivers.
E-commerce email at a fraction of the cost
Join e-commerce developers who've switched from Klaviyo to Plunk for dramatic cost savings and better API design.