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Dev Toolsdocker-ready1-click-deploypermissive-licenseOpen-Core🟡 Standard · ~1GB

Unleash: Open-Core alternative to LaunchDarkly in 2026

Unleash is an open source feature flag platform with user segmentation, gradual rollouts and SDKs for every popular language, an alternative to LaunchDarkly.

Core is open source, but advanced features or enterprise support may be behind a paid tier — check the license.

Alternative to LaunchDarkly
License Apache-2.013.9k starsWebsite GitHub Repository

Audit Snapshot

View notes →

  • License — Discrepancy with GitHub

  • GitHub — Active

  • Latest release — v8.2.0 · 1 month ago

  • Docker Compose — Partial

  • Production — Not production-tested by AltFreeStack

Unleash vs. LaunchDarkly

Pros

  • No charge per flag or per evaluated user

Things to consider

  • Flag analytics panel is more basic than LaunchDarkly's

Quick Docker installation guide

Copy this docker-compose.yml, adjust the example passwords and run docker compose up -d on your server. See the full step-by-step guide →

💡 Official SaaS or self-hosted with AltFreeStack?

  • On the official cloud: a recurring monthly fee and usage limits on LaunchDarkly.
  • On your own VPS: the core is free to self-host on your own server — no more monthly SaaS fee, though some advanced features stay behind a paid plan.
docker-compose.yml
version: "3.9"
services:
  unleash:
    image: unleashorg/unleash-server:8.2
    restart: unless-stopped
    ports:
      - "4242:4242"
    environment:
      - DATABASE_URL=postgres://unleash:change-me-postgres-password@unleash-db:5432/unleash # password must match the canonical db password below
    depends_on:
      - unleash-db
  unleash-db:
    image: postgres:15-alpine
    restart: unless-stopped
    environment:
      - POSTGRES_USER=unleash
      - POSTGRES_PASSWORD=change-me-postgres-password # REQUIRED: generate a random secret before first run
      - POSTGRES_DB=unleash
    volumes:
      - unleash_pg_data:/var/lib/postgresql/data
volumes:
  unleash_pg_data:

🚀 Deploy in 1 command

Recommended for beginners

Copy this single command and paste it into your freshly created VPS's console (Vultr, DigitalOcean...). It downloads the script, prints it to your screen so you can see exactly what it's about to do (never a blind direct pipe), and only then installs Docker if needed, writes the files with secrets already generated, and starts everything — no nano, no pasting code blocks.

curl -sSL ".../api/deploy?stack=unleash" -o deploy.sh && cat deploy.sh && bash deploy.sh
See what this script does →

This docker-compose corresponds to an actively maintained project — last commit today.

This docker-compose not working for you? Report it on GitHub →

Technical profile

License
Apache-2.0
Category
Dev Tools
Replaces
LaunchDarkly
Tech stack
Node.jsPostgreSQL

Under the hood

Database

PostgreSQL

Language

Node.js

Platforms

Web

Key features

  • Gradual rollouts and segmentation
  • SDKs for 20+ languages
  • Custom activation strategies

Preview

Unleash interface preview

Public image provided by Unleash on its own website.

💾 Backups in 3 steps (Day 2)

As long as the ./data folder (the "volume" mapped into the container) exists on your server, your data survives any restart or container update — that's the only thing you need to back up.

1. Create a compressed backup on the server

tar -czvf backup-$(date +%F).tar.gz ./data

2. Download it to your computer

From your computer's terminal (not your server's):

scp root@YOUR_IP:~/app/backup-*.tar.gz ./

3. Restore in case of emergency

tar -xzvf backup-file.tar.gz
🌐 Connect your domain with free SSL

Step 1 — Set up the DNS

In your domain registrar's dashboard (Cloudflare, Namecheap, GoDaddy...), create a record:

Type
A
Name/Host
@ (root domain) or a subdomain, e.g. app
Content/Value
Your server's public IP

Wait 5 to 15 minutes for the record to propagate across the internet.

Step 2 — Automatic reverse proxy with Caddy

One single file, no Nginx config or manual certificates — Caddy issues and renews Let's Encrypt HTTPS on its own.

Create a file called Caddyfile:

yourdomain.com {
    reverse_proxy localhost:4242
}

Start Caddy with this command (pulls the image and runs it in the background):

docker run -d -p 80:80 -p 443:443 --name caddy --restart always -v $PWD/Caddyfile:/etc/caddy/Caddyfile -v caddy_data:/data caddy