Kling - Self-Hosted Klaviyo Alternative for E-commerce

TL;DR

TL;DR: Kling is an open-source, self-hosted marketing automation platform that replaces Klaviyo at a fraction of the cost — running on your own infrastructure with email, SMS, WhatsApp, and a visual automation builder.

What Is Kling?

Kling is a self-hosted marketing automation platform built for e-commerce businesses. It positions itself as a Klaviyo alternative, letting you run email and SMS campaigns on your own infrastructure rather than paying recurring SaaS fees.

The pitch is concrete: Klaviyo charges around $720/month for 50,000 contacts. Kling says it cuts that cost by 70–90% by deploying on your own servers.

Core capabilities from the official README:

• Email and SMS campaigns with a drag-and-drop editor
• Multi-channel orchestration: email, SMS, WhatsApp, RCS, and push notifications
• Visual flow builder with 50+ automation triggers (cart abandonment, browse abandonment, purchase follow-ups)
• AI-powered campaign creation using natural language prompts
• Advanced segmentation with 30+ behavioral and demographic conditions
• Native e-commerce integrations: Shopify, WooCommerce, BigCommerce, Wix, Magento, and more
• REST API and webhooks for custom integrations
• Full GDPR compliance with data self-hosting

Setup Workflow

Kling runs as a Docker Compose stack with MongoDB as its database. The production setup requires a replica set for Prisma transaction support.

Prerequisites

• Docker and Docker Compose installed
• A domain pointed to your server
• At least 2GB RAM (4GB recommended for production)

Step 1: Clone the Repository

git clone https://github.com/kling-to/kling.git
cd kling

Step 2: Configure Environment Variables

Create a .env file with the required secrets:

JWT_SECRET=$(openssl rand -base64 32)
ENCRYPTION_KEY=$(openssl rand -hex 32)
DATABASE_URL="mongodb://mongodb:27017/kling"

The README provides the full docker-compose.production.yml which includes MongoDB, the Kling application server, and Traefik for reverse proxy handling.

Step 3: Start the Stack

docker compose -f docker-compose.production.yml up -d

After startup, open http://localhost:3001 and create your admin account.

Step 4: Connect an E-commerce Platform

From the Kling dashboard, navigate to Integrations and connect your store (Shopify, WooCommerce, BigCommerce, Wix, or Magento). Once connected, Kling begins syncing customer data and you can start building automation flows.

Deeper Analysis

Pricing Comparison

Kling’s own pricing comparison makes the case directly: running on your own VPS costs roughly the hosting fee (e.g., $20–80/month for a capable VPS) versus Klaviyo’s $720/month for equivalent contact volume. The Business Source License (BSL 1.1) allows self-hosting and internal use without the open-source commitment that would require full source disclosure.

Automation Builder

The visual flow builder is the centerpiece. You can trigger automations on events like cart abandonment, browse abandonment, post-purchase follow-ups, or custom webhook events. Each flow supports conditional logic, wait steps, and multi-branch paths.

AI Campaign Generation

Kling includes a natural language input for building campaigns — describe what you want (“send a discount to customers who abandoned cart after viewing the sale section”) and the AI constructs the flow. Send time optimization and content suggestions are included.

Deliverability

The platform includes standard email deliverability analytics: open rates, click rates, bounce tracking, and spam score monitoring. Self-hosting means you control the sending infrastructure, which can improve deliverability if properly configured with SPF/DKIM/DMARC records.

Practical Evaluation Checklist

• [ ] Docker and Docker Compose installed on a VPS
• [ ] docker-compose.production.yml reviewed for network and volume configuration
• [ ] MongoDB replica set initialized correctly (required for Prisma transactions)
• [ ] JWT_SECRET and ENCRYPTION_KEY generated and stored securely
• [ ] Domain configured with DNS A record pointing to server IP
• [ ] Traefik (included in docker-compose) configured with valid SSL certificates
• [ ] Admin account created at first startup
• [ ] E-commerce platform connected and customer data syncing
• [ ] SPF/DKIM/DMARC records configured for sending domain
• [ ] First test automation flow created and triggered

Security Notes

• All customer data stays on your infrastructure — no third-party data sharing
• BSL 1.1 license permits self-hosting and internal use; commercial deployment requires a commercial license from Kling
• Traefik handles SSL termination in the provided docker-compose setup
• Encryption key and JWT secret must be stored securely (not committed to git)

FAQ

Q: Does Kling work without an e-commerce platform? A: Yes. Kling can manage contacts manually or via the REST API and webhooks. E-commerce integrations (Shopify, WooCommerce, etc.) add native event tracking but are not required to use the platform.

Q: How does the BSL 1.1 license affect my use? A: The Business Source License permits self-hosting and internal use at no cost. If you want to offer Kling as a service to third parties, a commercial license is required. The source code is not fully open — audit and customization are allowed, but redistribution is restricted.

Q: Can I migrate from Klaviyo? A: Kling does not advertise a Klaviyo import tool in the current version. Migration would involve exporting your contact lists and re-importing via the API or CSV upload. Automation flows would need to be rebuilt manually.

Q: What happens when a new version is released? A: Update with docker compose -f docker-compose.production.yml pull && docker compose -f docker-compose.production.yml up -d for Docker installations, or git fetch --tags && git checkout vX.X.X && npm install --omit=dev && npx prisma generate for manual setups.

Source and Accuracy Notes

• Project page: kling.to
• Source repository: github.com/kling-to/kling
• License: Business Source License 1.1 (BSL 1.1) — verified via LICENSE file
• HN launch thread: news.ycombinator.com/item?id=46667519
• Documentation: kling.to/docs
• Source last checked: 2026-07-25 (README v1.0.25)