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PaaS 4 alternatives tracked

Open-source alternatives to Heroku

Heroku is a Platform-as-a-Service for deploying, managing, and scaling web applications without managing servers or infrastructure. Developers push code via git and Heroku handles runtime, scaling, and managed add-ons (Postgres, Redis, Kafka). It targets developers who want to deploy applications quickly without DevOps expertise, and has historically been a first deployment platform for startups.

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The alternatives

coolify

★ 54,620 PHP Apache-2.0

An open-source, self-hostable PaaS alternative to Vercel, Heroku & Netlify that lets you easily deploy static sites, databases, full-stack applications and 280+ one-click services on your own servers.

coollabsio/coolify Updated 2026-05-05

dokku

★ 31,854 Shell MIT

A docker-powered PaaS that helps you build and manage the lifecycle of applications

dokku/dokku Updated 2026-05-05

caprover

★ 15,006 TypeScript NOASSERTION

Scalable PaaS (automated Docker+nginx) - aka Heroku on Steroids

caprover/caprover Updated 2026-04-12

cli

★ 530 Rust MIT

Railway CLI

railwayapp/cli Updated 2026-04-22

Comparison notes

Coolify is the most Heroku-comparable self-hosted PaaS, supporting git push deployments, automatic SSL, and a marketplace of one-click services (Postgres, Redis, etc.) running on your own VPS. Dokku is a lighter Docker-based alternative with Heroku buildpack compatibility. CapRover provides a Docker Swarm-based PaaS. The main gaps: Heroku's managed Postgres service with automated backups and HA at a click has no equivalent without cloud provider help in self-hosting. Heroku's review apps (per-pull-request environments) are not replicated by most OSS alternatives. None of the OSS options match Heroku's Salesforce ecosystem integration depth.

Migration tips

  • Check if your app uses Heroku Buildpacks — Dokku and Coolify both support Buildpacks for compatible apps
  • Export Heroku Postgres databases using pg:backups:capture and download before migrating
  • Audit Heroku Add-on usage (SendGrid, Papertrail, New Relic) and configure equivalents in your target platform's services
  • Set environment variables in your new platform to match all Heroku Config Vars
  • Plan for a DNS cutover window — update DNS from Heroku's custom domain to your new server IP with appropriate TTL preparation

FAQ

Can I fully replace Heroku with an OSS tool?

Feature parity varies. Most OSS alternatives cover 70-90% of core workflows, but may lack polish, integrations, or specialized features. Pilot the alternative with a subset of your team before fully committing.

What's the cost of self-hosting?

Plan for ~$5-50/month in VPS costs (DigitalOcean, Hetzner, etc.) plus 2-8 hours/month in maintenance. For a team of 20+, self-hosting usually breaks even against SaaS pricing within 6-12 months.

Which alternative should I pick?

Sort by GitHub stars (a proxy for community health), check the last-pushed date (avoid unmaintained projects), and read recent issues to gauge responsiveness.