Fermyon Spin vs Fly.io

Fermyon Spin9.2Visit Fly.io9.1Visit

Higher score Fermyon Spin #2 in Rust Application Hosting 9.2/10 Free plan Free plan✓ 0 of 6 features Visit Fermyon Spin

vs

Fly.io #3 in Rust Application Hosting 9.1/10 7-day trial Free trial✓ 0 of 6 features Visit Fly.io

• Fermyon Spin fits best

  Rust WebAssembly applications and event-driven services

• Fly.io fits best

  Production Rust services needing multi-region control

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Side by side

Feature	Fermyon Spin 9.2/10 Visit ↗	Fly.io 9.1/10 Visit ↗
At a glance
Editor score	9.2	9.1
Ranking	#2 in Rust Application Hosting	#3 in Rust Application Hosting
Best for	Rust WebAssembly applications and event-driven services	Production Rust services needing multi-region control
Pricing model	Free plan + paid	Paid
Starting price	$19.38/mo	$1.94/device/mo (best)
Free plan	✓ (best)	—
Free trial	—	7 days
Deployment	Cloud, Self-hosted	Cloud, Browser extension
Platforms	Windows, macOS, Linux	Web, Linux
Support	Email, Live chat, Community, Docs	Community, Docs, Email, Tickets
Built for	Small business, Mid-market, Enterprise	Solo, Small business, Mid-market, Enterprise
Features Fermyon Spin 0/6 · Fly.io 0/6
Git deployment	Not checked yet	Not checked yet
Docker deployment	Not checked yet	Not checked yet
Persistent storage	Not checked yet	Not checked yet
Managed databases	Not checked yet	Not checked yet
Private networking	Not checked yet	Not checked yet
Background workers	Not checked yet	Not checked yet
Specs
Rust toolchain control	Not checked yet	Not checked yet
Our review
Pros	Supports Rust and other WebAssembly-compatible languages Combines HTTP, Redis, storage, and database connectivity Includes CLI-based development and GitHub Actions deployment	Multi-region placement with private and Anycast networking Rolling, canary, and blue-green deployment strategies Docker, Buildpack, flyctl, health checks, and persistent volumes
Cons	Cron triggers are experimental Enterprise pricing uses tailor-made requirements Hosting tiers are for deploying Spin applications to Fermyon Cloud	No permanent free plan Usage-based billing separates compute, storage, networking, and support Requires operating through flyctl and fly.toml
Our verdict	Fermyon Spin is an open-source framework and CLI for building, running, and deploying WebAssembly microservices and web applications. It is suited to developers building Rust WebAssembly applications, event-driven services, and web… Read the review →	Fly.io is a cloud application platform for deploying applications as Docker images to hardware-isolated Fly Machines in regions worldwide. It fits teams running production Rust services that need control over placement, networking,… Read the review →

Strengths and trade-offs

• Fermyon Spin — where it wins

  • Supports Rust and other WebAssembly-compatible languages
  • Combines HTTP, Redis, storage, and database connectivity
  • Includes CLI-based development and GitHub Actions deployment

  Where it doesn't

  • Cron triggers are experimental
  • Enterprise pricing uses tailor-made requirements
  • Hosting tiers are for deploying Spin applications to Fermyon Cloud

• Fly.io — where it wins

  • Multi-region placement with private and Anycast networking
  • Rolling, canary, and blue-green deployment strategies
  • Docker, Buildpack, flyctl, health checks, and persistent volumes

  Where it doesn't

  • No permanent free plan
  • Usage-based billing separates compute, storage, networking, and support
  • Requires operating through flyctl and fly.toml

• Fermyon Spin9.2/10 · Free plan

  A focused Rust WebAssembly platform with event triggers, storage, and streaming responses.

  Visit Fermyon SpinFull verdict →
• Fly.io9.1/10 · 7-day trial

  A low-cost, deployment-focused platform for Rust services needing multi-region control.

  Visit Fly.ioFull verdict →