Open-source alternative
for Customer.io
Customer.io is powerful but complex. Plunk gives developers the automation they need without the enterprise overhead.
Simple Pricing That Scales
Transparent pay-as-you-go vs complex enterprise tiers
Pay per email sent
Pay-as-you-go pricing. Only pay for emails you actually send.
Complex usage-based pricing
Pricing based on profiles, messages, and feature tiers.
Feature-by-Feature
Key Advantages
Why developers choose Plunk
Developer-First Experience
Clean, simple APIs designed for developers. No complex visual builders or marketing jargon. Integrate in minutes, not weeks.
Transparent Pricing
Pay-as-you-go pricing with no hidden costs or complex tiers. No need to pay for contact lists or profile counts - just emails sent.
Open Source
AGPL-3.0 licensed. Inspect the code, contribute features, fork if needed. No vendor lock-in with proprietary platforms.
Quick Setup
Minutes to integrate and start sending. No lengthy onboarding, no sales calls, no enterprise setup processes. Start free immediately.
Self-Hosting Option
Run on your infrastructure with Docker. Full data control, compliance-ready. Pay only AWS SES fees when self-hosting.
Simplicity at Scale
Simple workflows that scale without over-engineering. Get enterprise capabilities without enterprise complexity or dedicated ops teams.
Try Plunk free
1,000 emails/month free. No credit card required. Developer-friendly from day one.