Heroku vs Railway vs Fly.io

Heroku pioneered the Platform-as-a-Service model with its git-push deployment workflow. Railway and Fly.io are modern alternatives that have emerged as Heroku's appeal has declined following the removal of its free tier and Salesforce's reduced investment.

Heroku — The Original PaaS

Heroku's strength is maturity. It has been running production workloads since 2007. Its add-ons marketplace offers 150+ integrations for databases, monitoring, email, caching, and more. Heroku Enterprise provides Private Spaces with VPC isolation and compliance certifications. However, Heroku's pricing is expensive, its free tier is gone, and its platform has seen limited innovation.

Railway — The Modern Heroku

Railway offers what many wish Heroku still was: simple deployment, built-in databases (Postgres, MySQL, Redis), modern UI, usage-based pricing, and excellent developer experience. You connect a GitHub repo, Railway auto-detects the framework, and deploys. Database provisioning is built-in — no add-on marketplace needed.

Fly.io — Deploy at the Edge

Fly.io takes a different approach: it runs Docker containers on lightweight VMs (Firecracker) deployed to regions closest to your users. You get edge deployment for any application, not just static sites. Fly.io is ideal for latency-sensitive applications that need multi-region presence. Its CLI-driven workflow and machines API provide more control than traditional PaaS.

Pricing Comparison

Heroku starts at $5/mo for a Basic dyno. Railway offers $5 of free trial credit, then usage-based pricing. Fly.io offers $5 of free allowance per month. For small projects, Railway and Fly.io are significantly cheaper. At scale, all three become expensive compared to running containers directly on cloud providers.

For deployment architecture patterns, explore our concepts and system design interview guide. Check interview questions and pricing.