Render vs Fly.io

Render

Fly.io

Render · 13 features

• Autoscaling — Metric-based autoscale of instances.
• Background Workers — Process queue workers. No HTTP entrypoint.
• Blueprints (render.yaml) — Infrastructure-as-code config for all services.
• Cron Jobs — Scheduled Docker jobs.
• Custom Domains — Free SSL, automatic cert renewal.
• DDoS Protection — Built-in.
• Persistent Disks — Attach persistent SSD to services.
• Preview Environments — Per-PR preview envs with their own DB and services.
• Private Services — Internal services not exposed to the public internet.
• Render Key Value (Redis) — Managed Redis-compatible key-value store.
• Render Postgres — Managed PostgreSQL with automated backups.
• Static Sites — Git-backed static hosting with global CDN, free SSL.
• Web Services — Long-running HTTP services with auto-scale + health checks.

Fly.io · 14 features

• Auto Stop/Start — Machines auto-stop when idle, start on request (like scale-to-zero).
• Certs — Let's Encrypt + wildcard certs managed.
• Fly GPU — A100/L40S/A10 on-demand GPU machines.
• Fly Kubernetes (FKS) — Managed Kubernetes on Fly machines.
• Fly Machines — Firecracker microVMs. Start in <1s. Run any Docker image.
• Fly Postgres — Managed Postgres via Supabase partnership (2024). Also legacy self-run Postgres …
• fly-replay headers — Route request to another region at app level.
• Fly Volumes — Persistent SSD attached to a Machine. Encrypted at rest.
• Global Anycast — Single IP routes to the closest region automatically.
• LiteFS — Distributed SQLite with primary/replica across regions.
• Private Networks — 6PN WireGuard mesh. Connect machines across regions privately.
• Secrets — Encrypted env vars propagated to all regions.
• Tigris (partner) — S3-compatible storage for Fly apps. By partner.
• Upstash Redis (partner) — Managed Redis via Upstash.