Best Open Source Alternatives to Heroku in 2026

Heroku killed its free tier in 2022 and now starts at $5/dyno/month with $7/month for Postgres. For hobby projects and startups, that adds up. The good news: open source PaaS options now replicate the Heroku experience — git push deploys, buildpacks, add-ons — on $5/month VPS instances.

TL;DR

Dokku is the closest Heroku experience — same git push workflow, buildpack support, and plugin ecosystem. It's literally called "the smallest PaaS." Coolify adds a web dashboard and more features. Both run on a single VPS for $5/month.

Key Takeaways

• Dokku is the spiritual successor to Heroku — git push dokku main deploys your app exactly like git push heroku main
• Dokku supports Heroku buildpacks — your existing Procfile and buildpack config just works
• Coolify offers Heroku's ease plus a web dashboard — better for teams and visual management
• CapRover adds cluster support — multiple servers behind a load balancer
• Piku is the ultra-minimalist option — deploys to any server, inspired by Dokku but even simpler
• A $5 Hetzner VPS replaces $50+/month in Heroku dynos and add-ons

The Comparison

Feature	Heroku	Dokku	Coolify	CapRover	Piku
Price	$5-250/dyno	Free (OSS)	Free (OSS)	Free (OSS)	Free (OSS)
git push deploy	✅	✅	✅	✅	✅
Buildpacks	✅	✅	Nixpacks	✅	❌
Procfile	✅	✅	❌	❌	✅
Add-ons	Marketplace	Plugins	One-click	One-click	Manual
Web UI	✅	❌ (CLI)	✅	✅	❌
Database	Paid add-on	Plugin	Built-in	One-click	Manual
SSL	✅	Plugin	✅	✅	✅
Custom domains	✅	✅	✅	✅	✅
Scaling	Horizontal	Vertical	Multi-server	Docker Swarm	❌
Review apps	✅	Plugin	✅	❌	❌
Logs	✅	✅	✅	✅	✅
Setup time	0 min	10 min	5 min	10 min	5 min

1. Dokku — The Heroku Clone

Same workflow, your server.

Dokku is the most Heroku-like option. If you've used Heroku, you already know how Dokku works:

# Heroku                          # Dokku
heroku create my-app       →      dokku apps:create my-app
heroku addons:create heroku-postgres → dokku postgres:create my-db
                                      dokku postgres:link my-db my-app
git push heroku main       →      git push dokku main
heroku config:set KEY=val  →      dokku config:set my-app KEY=val
heroku logs --tail         →      dokku logs my-app --tail
heroku ps:scale web=2      →      dokku ps:scale my-app web=2

Popular Dokku plugins:

• dokku-postgres — PostgreSQL databases
• dokku-redis — Redis instances
• dokku-mongo — MongoDB databases
• dokku-mysql — MySQL databases
• dokku-letsencrypt — Automatic SSL
• dokku-maintenance — Maintenance mode
• dokku-redirect — URL redirects

Migrating from Heroku

# 1. Install Dokku on your VPS
wget -NP . https://dokku.com/install/v0.35.x/bootstrap.sh
sudo bash bootstrap.sh

# 2. Create app
dokku apps:create my-app

# 3. Create and link database
dokku postgres:create my-db
dokku postgres:link my-db my-app

# 4. Set environment variables
dokku config:set my-app \
  SECRET_KEY=xxx \
  DATABASE_URL=auto  # Set automatically by postgres:link

# 5. Add git remote and push
git remote add dokku dokku@your-server:my-app
git push dokku main

# 6. Enable SSL
dokku letsencrypt:enable my-app

Best for: Heroku users who want the exact same workflow on their own server.

2. Coolify — Heroku + Dashboard

Everything from the Vercel article applies here. Coolify is the dashboard-first PaaS that handles Git deploys, databases, SSL, and one-click apps. It's Heroku with a modern UI.

Best for: Teams wanting a web interface, multi-app deployments, anyone who prefers clicking over CLI.

3. CapRover — Heroku + Clustering

CapRover provides the web dashboard experience with Docker Swarm clustering — deploy across multiple servers with a load balancer. Good middle ground between Dokku (too simple) and Kubernetes (too complex).

Best for: Growing apps that need horizontal scaling, teams wanting one-click deploys with clustering.

4. Piku — Ultra-Minimalist

Heroku-like deploys with nothing but SSH.

• GitHub: 6K+ stars
• Stack: Python, shell
• License: MIT
• Deploy: Any server with SSH

Piku is the absolute minimum. It needs only Python and SSH on the target server — no Docker, no containers, no complex setup. git push deploys using a Procfile, just like Heroku.

# Deploy is literally:
git remote add piku piku@your-server:my-app
git push piku main

Supports: Python, Node.js, Ruby, Go, Java, Clojure — anything you can run from a Procfile.

Best for: Single-server hobby deployments, Raspberry Pi projects, developers who want zero overhead.

Cost Comparison

Scenario	Heroku	Dokku (Hetzner)	Coolify (Hetzner)
1 web app + Postgres	$14/month	$4.50/month	$4.50/month
3 apps + DB + Redis	$46/month	$7/month	$7/month
5 apps + 3 DBs + workers	$120+/month	$14/month	$14/month
Annual savings (5 apps)	—	$1,272/year	$1,272/year

Decision Guide

Choose Dokku if:

• You want the closest Heroku experience
• You're comfortable with CLI
• Heroku buildpack compatibility matters
• You want a battle-tested, mature solution

Choose Coolify if:

• You want a web dashboard
• You manage multiple apps
• One-click database setup is appealing
• You want Docker Compose support

Choose CapRover if:

• You need multi-server clustering
• Docker Swarm is your scaling model
• Web UI plus scaling matters

Choose Piku if:

• You want absolute simplicity
• No Docker, no containers
• Single server, hobby projects
• Raspberry Pi or lightweight servers

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Migrating Applications from Heroku to Dokku

For teams currently running on Heroku who want to migrate without rewriting their deployment configuration, Dokku is the path of least resistance. The Heroku compatibility layer is intentional — Dokku was built specifically to replicate the Heroku workflow, so most Heroku applications require zero code changes.

Understanding what transfers directly. Your Procfile works without modification. Heroku buildpacks work with Dokku — the same BUILDPACK_URL environment variable that Heroku reads, Dokku reads too. Environment variables set via heroku config:set migrate directly to dokku config:set. If your application reads its database URL from a DATABASE_URL environment variable (the Heroku convention), Dokku's postgres plugin sets DATABASE_URL automatically when you link a database to an app.

Application migration steps. Start by adding a Dokku remote to your existing repository alongside your Heroku remote. This lets you deploy to both simultaneously during a transition period — send traffic to Heroku while verifying Dokku works correctly. Once the Dokku deployment is stable and passing your verification checks, update DNS to point at your Dokku server and sunset the Heroku application. The parallel operation period avoids any traffic downtime.

Database migration. Export your Heroku Postgres database using heroku pg:backups:capture and heroku pg:backups:download. Restore the dump into your Dokku Postgres instance using pg_restore via dokku postgres:connect. For databases under 5GB, this process takes minutes. For larger databases, schedule the migration during low-traffic hours and use the --jobs flag for parallel restore to minimize downtime.

Zero-downtime concerns. Heroku's rolling restart behavior ensures zero-downtime deployments when you have multiple dynos. Dokku's zero-downtime deployment support is available but requires explicit configuration — enable it per-app with dokku checks:enable. Without this configuration, Dokku stops the running container before starting the new one, causing a brief interruption. For production applications, enable zero-downtime checks before your first production deployment.

SSL and custom domains. The Heroku SSL add-on costs $7/month per endpoint. Dokku's letsencrypt plugin provides the equivalent functionality for free using Let's Encrypt certificates with automatic renewal. Run dokku letsencrypt:enable my-app after adding your custom domain and DNS propagation — it handles the entire certificate issuance and renewal lifecycle automatically.

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Operational Maintenance: Keeping Self-Hosted PaaS Running Well

The appeal of Heroku is that platform maintenance is invisible — Heroku handles OS updates, buildpack version management, and infrastructure scaling without operator intervention. Self-hosted PaaS tools shift this responsibility to you, but the actual maintenance burden is lower than it might appear.

Server updates. Your VPS runs a Linux distribution (typically Ubuntu or Debian) that requires regular security updates. Configure unattended-upgrades to apply security patches automatically for the OS. For Dokku itself, updates are infrequent and straightforward: the dokku-update plugin or manual package update via apt handles the upgrade. Dokku has a strong backwards compatibility track record — applications that ran on Dokku 0.20 continue to work on current versions without modification.

Buildpack management. Dokku's buildpacks detect your application's language and install the appropriate runtime. The buildpack versions lag slightly behind the latest language releases. For most applications, this is fine — Node.js 20 LTS, Python 3.11, and Ruby 3.2 are all current and well-supported. If you need the very latest language version, specify an exact buildpack version or use a Dockerfile-based deployment instead of buildpacks.

Disk space management. Each Dokku deployment creates Docker images that accumulate over time. Without periodic cleanup, these images can consume substantial disk space. Dokku provides a cleanup command that removes outdated images. Automate this via a weekly cron job. For applications that deploy frequently (multiple times per day), disk pressure can build faster — monitor disk usage and set alerts before you run out of space rather than discovering the problem when a deployment fails.

Log retention. Application logs via dokku logs my-app show only the most recent output. For persistent log retention (required for debugging issues that happened hours or days ago), ship logs to a centralized log aggregation service. The open source option is Loki, covered in the self-hosted observability stack guide. A simpler approach is to configure Docker's logging driver to ship to a hosted log service like Papertrail or Logtail, which both have free tiers sufficient for small application deployments.

Monitoring and alerting. Set up external uptime monitoring for your deployed applications. An application server going down is a separate failure mode from your applications becoming unhealthy while the server is up. Use Uptime Kuma or a similar tool to monitor each application's HTTP health endpoint. Configure alerts to your team's preferred notification channel so downtime is caught quickly rather than discovered by a user complaint.

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Coolify vs. Dokku: Choosing Based on Your Team's Profile

Both Coolify and Dokku are genuinely capable Heroku replacements, but they're designed for different operator profiles. Choosing the wrong one for your team creates friction that persists throughout your deployment workflow.

Dokku is the right choice if your team has strong CLI discipline, values simplicity and auditability over convenience features, and primarily manages applications through infrastructure-as-code practices. Dokku's configuration is expressed in git remotes, environment variables, and plugin commands — the entire state of your deployment platform is inspectable via CLI. For teams that already use IaC tools like Terraform or Ansible, Dokku integrates more naturally into those workflows than a GUI-first tool.

Coolify is the right choice if your team includes people who manage applications but aren't comfortable with SSH and CLI commands, if you manage a diverse set of services (not just your own applications but also databases, monitoring tools, and one-click services), or if you want visual deployment management without building a custom dashboard. Coolify's web interface handles deployment triggers, environment variable management, domain configuration, and SSL — all the operational tasks that require Dokku plugin knowledge when done via CLI. The Coolify vs. Dokku comparison examines both tools in depth with specific scenario recommendations.

The hybrid approach that some teams use is Dokku for application deployments (taking advantage of Heroku buildpack compatibility) and Coolify for auxiliary services (databases, Redis, monitoring tools via Coolify's one-click app catalog). This is reasonable but adds cognitive overhead — you're learning two deployment systems instead of one. In practice, either tool handles the full stack adequately, and the choice is more about team culture than technical capability.

For teams evaluating where self-hosted PaaS fits in a broader infrastructure picture, it's worth noting that these tools solve the application layer specifically — they don't replace your database managed services, CDN, or DNS management. The right mental model is: self-hosted PaaS handles your compute layer for the same price as a VPS (because that's what it runs on), while other infrastructure components are mix-and-match.

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Compare open source PaaS platforms on OSSAlt — deployment workflows, add-on support, and scaling options side by side.

See open source alternatives to Heroku on OSSAlt.