Railway vs. Fly.io

As AI technology advances, choosing the right platform is crucial for your team's speed, governance, and long-term success. Both Railway and Fly.io have their strengths. The sections below compare them across developer experience, scalability, and total cost of ownership.

As AI technologies evolve, delivering and scaling applications has become essential for powering modern businesses, from AI startups to large-scale enterprises. There are various solutions available, including comprehensive cloud operating systems, managed Platform-as-a-Service (PaaS), and traditional IaaS. Selecting the right platform is crucial for your team's velocity, governance, and long-term success.

Railway and Fly.io both bring unique strengths to application delivery, each with its own capabilities and limitations. The best choice depends on your specific use case and requirements. In the following sections, we'll compare both platforms regarding developer experience, scalability, and total cost of ownership, helping you determine the most suitable option for your needs—even if it's not us.

Railway vs. Fly.io at a Glance

Feature	Railway	Fly.io
Infrastructure	Proprietary PaaS	Edge micro-VMs (Firecracker)
Source Available
Deployment Options	Cloud only BYO Cloud: Enterprise	Cloud only
Free Trial	30 days, $5 credit	Free allowance (shared CPU, limited)
Max vCPU per Service	Hobby: 8, Pro: 32	Plan-based (per VM size)
Max RAM per Service	Hobby: 8GB, Pro: 32GB	Plan-based (per VM size)
Custom Domains	Hobby: 2, Pro: 20
Replicas per Service	Hobby: 5, Pro: 50	(within org limits)
Cron Jobs	Hobby: 50, Pro: 100	Scheduled machines
Log Retention	Free: 3d, Hobby: 7d, Pro: 30d	Limited (plan-based)
Scale-to-Zero	(saves on idle)	(saves on idle)
App Marketplace

Cost evidence

Monthly Cost Examples: Plans vs. Usage Billing

Estimates use the listed average CPU and RAM for a 30-day month. Storage and egress are excluded unless a platform note says otherwise.

Workload examplePlatform and monthly costEstimated difference

Small API

2 vCPU, 4GB RAM, 24/7

RailwayEstimate

~$80/mo

Fly.ioEstimate

~$85/mo

Railway 71% lower

Medium App

8 vCPU, 16GB RAM, 24/7

RailwayEstimate

~$320/mo

Fly.ioEstimate

~$300/mo

Railway 57% lower

Production Stack

16 vCPU, 32GB RAM, 24/7

RailwayEstimate

~$640/mo

Fly.ioEstimate

~$600/mo

Railway 15% lower

Small API

2 vCPU, 4GB RAM, 24/7

RailwayEstimate

~$80/mo

Fly.ioEstimate

~$85/mo

Railway 71% lower

Medium App

8 vCPU, 16GB RAM, 24/7

RailwayEstimate

~$320/mo

Fly.ioEstimate

~$300/mo

Railway 57% lower

Production Stack

16 vCPU, 32GB RAM, 24/7

RailwayEstimate

~$640/mo

Fly.ioEstimate

~$600/mo

Railway 15% lower

Estimate uses $20/vCPU-month and $10/GB-month at the listed average usage. Volume and egress are excluded from these three examples. Verified 2026-07-28.

Fly.io calculation: estimated using always-on VM pricing (CPU + RAM) across 720 hours/month

Sources:Railway pricing documentation·Fly.io Pricing

Railway Overview

Railway is a managed Platform-as-a-Service (PaaS) that simplifies application deployment through Git integration and usage-based billing. It automates builds and deploys for web services, background workers, Cron Jobs, and databases. Railway provides a fast path from code to production with automatic scaling (including scale-to-zero), abstracting away infrastructure complexity for individual developers and small teams.

Fly.io Overview

Fly.io is an edge application platform that runs apps as lightweight Firecracker micro-VMs across a global network. It emphasizes Dockerfile-first deployments and a powerful CLI (`flyctl`) for fast, scriptable workflows. Fly.io provides Anycast networking, global routing, per-region scaling, and scale-to-zero for idle workloads, making it a strong fit for latency-sensitive apps and globally distributed teams.