What Sets Them Apart
Coolify has rapidly emerged as the most polished self-hosted PaaS option available in 2024. It provides a beautiful, modern web UI built with Svelte that makes deploying applications, databases, and services as intuitive as using Vercel. Coolify supports one-click deployments for over 100 services, automatic SSL via Let's Encrypt, built-in monitoring, and seamless Docker Compose support. The project is backed by a sustainable open-source model with a paid cloud version starting at $5/month, while the self-hosted edition remains completely free. Resource usage is modest — Coolify itself runs comfortably on a 2 GB RAM VPS alongside your applications.
The CLI Purist and the Middle Ground
Dokku is the original self-hosted PaaS, often described as a "Docker-powered mini-Heroku." It is entirely CLI-driven with no web interface, which makes it incredibly lightweight — requiring as little as 512 MB of RAM for the platform itself. Dokku uses a git-push deployment model inspired by Heroku, supports buildpacks and Dockerfiles, and has a rich plugin ecosystem for databases (Postgres, Redis, MySQL), Let's Encrypt SSL, and more. The trade-off is that every operation happens via SSH commands, so there is a steeper learning curve for developers accustomed to graphical dashboards. Dokku is completely free and open-source with no paid tier.
CapRover positions itself between Coolify and Dokku by offering a web-based UI while maintaining a simpler architecture. It features a one-click app marketplace with around 50 pre-configured services, automatic SSL, and Docker Swarm-based clustering for multi-server setups. CapRover's UI is functional but noticeably dated compared to Coolify's modern design, and the project's update cadence has slowed considerably — the last major release cycle saw gaps of several months between updates. It requires a minimum of 1 GB RAM and works best on a dedicated 2 GB+ VPS. CapRover is free and open-source.
Docker Support and Community Health
In terms of Docker support, all three platforms handle Dockerfiles and Docker Compose natively, but they differ in orchestration. Dokku uses a single-server model without built-in clustering, relying on external tools for multi-server setups. CapRover leverages Docker Swarm for horizontal scaling across multiple nodes, which is a genuine advantage for teams needing high availability without Kubernetes complexity. Coolify recently added multi-server support in v4, allowing you to manage deployments across multiple VPS instances from a single dashboard, combining the ease of a UI with distributed infrastructure.