How to Build Your Own Fly.io
Replace Fly.io with a custom build. Deploy app servers close to your users
Build Difficulty: 4/5
A few focused days to build a solid replacement
Estimated Timeline
Based on 31 features at Few Days difficulty, expect about 3-5 days with AI-assisted development.
Recommended Tech Stack
Full-stack React framework with API routes and server components
PostgreSQL database, auth, and real-time subscriptions
Utility-first styling for rapid UI development
Key Features to Replicate
Top features across 8 categories. See all 31 features
Compute(5 features)
Checkpoint entire environments, run anything, and restore if something breaks
Hardware-virtualized containers that launch instantly and run only when needed
Support for GPU workloads
Get persistent brains when needed or ephemeral workers when not required
Fork off VMs like they're processes with instant startup
Security(5 features)
Access control lists and narrowly scoped tokens for security
Applications run on KVM hardware-isolated infrastructure
Built on a memory-safe stack using Rust and Go
Hardware-isolated sandboxes for running AI-generated code and untrusted code in complete safety with self-contained environments ready in under a second
SSO authentication for enterprise users
Developer Experience(4 features)
CLI generates containers for most popular frameworks without requiring a Dockerfile
Command-line interface for orchestration from terminal with unlimited users per organization
Build with favorite frameworks including Rails, Phoenix, Django, Node, Laravel, and .NET
Tool to estimate personalized costs based on expected usage
Storage(4 features)
Snapshot environments and persist state alongside sandboxes
Fast local NVMe for low-latency work
Global, durable object storage for data that needs to persist
Scale storage right alongside sandboxes
Billing(3 features)
Aggregated billing across multiple organizations
Pay up front and save 40% with machine reservations
Pay only for actual CPU and memory consumption, down to the second
Account Management(2 features)
Waived or refunded unintended charges for paid support customers
Create and manage unlimited organizations
Compliance(2 features)
HIPAA-compliant workloads with BAAs and SOC2 certifications
SOC2 Type 2 attested infrastructure for enterprise compliance
Database(1 features)
Run clustered databases like Cockroach, globally-distributed Postgres, and modern RPC systems like Elixir FLAME
Cost Calculator
Keep Paying Fly.io
Build It Yourself
Total Cost Comparison
DIY hosting estimate based on Vercel + Supabase free/pro tiers (~$20/mo). Build time estimated from 31 features at easy complexity.