vioscaleAI
Comparison

Fly.io vs Railway

On the evidence we track, Railway leads this comparison with a composite score of 80/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Fly.io full profile →Railway full profile →
Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
Fly.io71
★Railway80
Score
vioscaleAI score
Fly.io71 / 100medium · 63%
Railway80 / 100medium · 60%
Pricing
Free tier
Fly.io✓
Railway✓
Model
Fly.iocommercial
Railwayfreemium
Price level
Fly.iounknown
Railwaylow
Starting price
Fly.io–
Railway$5
Transparent
Fly.io✗
Railway✓
Integrations
Count
Fly.io4
Railway7
Security
Certifications
Fly.io–
RailwaySOC 2, HIPAA
Disclosure policy
Fly.io–
Railway✓
Gdpr
Fly.io–
Railway✓
Hipaa
Fly.io✓
Railway✓
Iso27001
Fly.io✓
Railway–
Soc2
Fly.io✓
Railway✓
Trust center
Reliability
Sla pct
Fly.io99.9
Railway99.99
Status page
Fly.io✓
Railway✓
Market
Availability
Content
Faq
Fly.io7 items
Railway6 items

Capabilities

Feature-by-feature on the axes that matter for paas & hosting. “-” means undocumented, not absent.

Deploy
Git-push auto-deploy
Fly.io-
Railway✓
Deploy arbitrary container image
Fly.io✓
Railway✓
Per-PR preview environments
Fly.io-
Railway✓
Build
Build system
Fly.ioDockerfile
RailwayDockerfile
Runtime / language breadth
Fly.ioDocker containers, Node.js, Deno, and other containerized runtimes
RailwayMulti-language support via Railpack auto-detection and templates
Scale
Autoscaling
Fly.ioHorizontal
RailwayHorizontal
Deployment
Geographic reach
Fly.ioMulti-region
RailwayMulti-region
Hosting
Fly.ioCloud only
RailwayCloud + self-hosted
Data
Bundled managed data services
Fly.io✓
Railway✓
Delivery
Built-in global CDN / edge
Fly.io-
Railway✓
Custom domains + automatic TLS
Fly.io✓
Railway✓
Ops
Env vars & secrets management
Fly.io✓
Railway✓
Instant rollbacks
Fly.io✓
Railway✓
Extensibility
CLI + deploy API
Fly.io✓
Railway✓

What each one is

The product in its own terms, so the numbers below have context.

Fly.io

A cloud service offering hardware-isolated Linux virtual machines optimized for running AI agents and tools, featuring persistent storage, checkpoint and rollback capabilities, and API gateway-based credential management.

Independently observed

Railway

Leader

A cloud deployment service that connects to your code repository, automatically builds and deploys applications, provides integrated databases and monitoring, and handles scaling and traffic management.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Fly.io

from $29/moUsage-based

Usage-based pricing (pay-as-you-go) with optional prepayment for 40% discount. Serious Support from $29/month. HIPAA compliance at $99/month. Enterprise available via contact.

  • Pay-as-You-GoPay only for what you use
    • Micro VMs
    • Persistent storage
    • Private networking
    • Unlimited users per organization
  • Serious SupportStarting at $29/month
    • Dedicated support team
  • HIPAA Compliance$99/month
    • HIPAA-compliant workloads
    • BAAs
    • SOC2 certification
  • Machine ReservationSave 40% with upfront commitment
    • 40% discount vs pay-as-you-go
  • EnterpriseContact sales
    • Custom resource configurations
    • SLA requirements
    • Emergency support
as of verify ↗

Railway

Leader
from $5/moSubscriptionFree tier30-day trial

Free tier + Hobby ($5/month) + Pro ($20/month) + Enterprise (custom). Sandbox infrastructure metered at $50/GB RAM, $50/vCPU, $0.05/GB egress.

  • FreeFree
    • 30-day free trial with $5 credits
    • Up to 1 vCPU / 0.5 GB RAM per service
    • Community support
  • Hobby$5/month included credits
    • Up to 48 vCPU / 48 GB RAM per service
    • Up to 5 replicas at 8 vCPU / 8 GB RAM
    • Single developer workspace
    • 99.9% Availability Target
    • Global regions
    • +11 more
  • Pro$20/month included credits
    • Up to 1,000 vCPU / 1 TB RAM per service
    • Up to 42 replicas at 24 vCPU / 24 GB RAM
    • Railway Support
    • 99.99% Availability Target
    • Concurrent global regions
  • EnterpriseContact sales
    • 18-Month Audit Log Retention
    • Role-Based Access Control
    • HIPAA Business Associate Agreements
    • 99.999% Availability Target
    • Isolated Linux VMs for agents, builds, and untrusted code
    • +4 more
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Fly.io✗
Railway✓
iOS
Fly.io✗
Railway✓
Android
Fly.io✗
Railway✓
CLI
Fly.io✓
Railway✓
Deployment
Cloud / SaaS
Fly.io✓
Railway✓
Self-hosted
Fly.io✗
Railway✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

In common (2)
  • GitHub
  • Slack

Fly.io

9 total - 7 not shared
  • Sentry
  • Supabase
  • Upstash
  • LiteFS
  • Tigris
  • OpenRouter
  • HTTP API
Independently observed

Railway

Leader
11 total - 9 not shared
  • Docker
  • Discord
  • PostgreSQL
  • MySQL
  • MongoDB
  • Redis
  • Email
  • ChatGPT
  • Grok
Independently observed
Still deciding?

Fly.io or Railway: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.