Fly.io Homepage

Fly.io

PaaS for Edge Apps With Auto-Scaling

United States
Category
Compute CaaS DBaaS PaaS API Gateway
Pricing Model

Overview

Fly.io Homepage
Fly.io Homepage
Category
Compute CaaS DBaaS PaaS API Gateway
Pricing Model

What is Fly.io?

Fly.io is a platform designed for deploying applications at the edge. It’s perfect for anyone who wants to dip their toes into edge computing without getting lost in complicated setups, or more experienced teams needing robust deployment solutions. With built-in support for databases like Postgres and Redis, as well as tools for managing secrets and environment variables on top of its main offerings, it’s a go-to for curious developers and startups eager to experiment.

The platform uses Docker to manage containers and runs applications with Firecracker microVMs, lightweight, secure virtual machines based on strong hardware virtualization. Fly.io is all about making app distribution simpler and more efficient, raising the bar for others in the edge computing space.

Focus

  • Global Application Deployment: Deploy applications across 35 regions.

  • Serverless Computing with Control: Serverful JavaScript applications that boot as quickly as serverless functions, with control over their environment.

  • AI and Machine Learning Workloads: GPU-boosted models for tasks such as large language model inferencing.

  • Managed Databases and Distributed Systems: Management of clustered databases like CockroachDB and globally-distributed Postgres.

Key Features

  • Firecracker MicroVMs: Lightweight, secure virtual machines that provide strong isolation and fast launch times.

  • Global Anycast Networking: BGP Anycast routes user requests to the nearest data center.

  • CI/CD Integration: Automate deployments directly from version control systems like GitHub.

  • Flexible Application Management: Create, manage, and scale applications with Fly Launch and Fly Apps.

Pricing

Fly.io has dropped their mixed billing model in October 2024. Billing is now based on the resources provisioned for your apps, pro-rated for the time they are provisioned, billed per organization

  • Each 1GB of rootfs for a Machine stopped for 30 days is $0.15

  • Prices vary per region

  • 40% discount when you reserve a block of CPU compute time

*Free Trials and Hobby, Launch, and Scale plans (+free allowances) are no longer available for new customers.

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Features

Category

Compute
CaaS
DBaaS
PaaS
API Gateway

Container Deployment

Docker
Docker Private Registry
Kubernetes
Managed Kubernetes

Supported Runtimes

.NET
Crystal
Deno
Elixir
Go
Java
JavaScript
PHP
Python
Ruby
Rust

Execution Limits and Resource Quotas

Min. Memory
256 MB
Max. Memory
32 GB
Default Timeout
60 s
Max. Timeout
5 min
Request Payload
200 KB
Response Payload
∞

Compliance

BAA
DPA
GDPR
HIPAA
PHIPA
SOC2

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Fly.io Regions

Fly.io's 35 datacenter locations by region. (October 16, 2024) - Map by d3js.org
Last updated: October 16, 2024

*Information is subject to change. Verify with the official Fly.io website.

Listings & Sponsorships

Reach developers researching deployment platforms.

Put your platform in front of developers, CTOs, and teams comparing serverless infrastructure, runtimes, and deployment solutions.

  • ✅ Reviewed provider listings on srvrlss.io
  • ✅ Sponsorship placements across high-visibility sections
  • ✅ Reach an audience actively researching platforms

Best Fly.io Alternatives

Alternatives to Fly.io by matching platform type, use cases, supported runtimes and deployment options.
Railway logo
Convox logo
Fermyon Cloud logo
Dokku logo

Frequently Asked Questions about Fly.io

Not in the traditional sense. Fly.io retired its free allowances for new accounts. Pricing is now usage-based from the start with the Hobby plan at $5/month minimum. That $5 includes some compute and Postgres resources. If you want a free option, compare Railway, Render, and Koyeb which all offer free tiers with scale-to-zero.

Fly.io is usage-based. The Hobby plan starts at $5/month and includes some compute and database resources. Beyond that, you pay for CPU, memory, storage, and network. A small API or web app with a Postgres database typically runs $10 to $30 per month. Use Fly.io’s pricing calculator to estimate your specific workload.

Fly.io is closer to a PaaS than a serverless platform in the strict sense. You deploy Docker containers as microVMs using Firecracker. They scale to zero when idle, so you get serverless-like billing, but you control the full environment and runtime. This makes it a hybrid: serverless in behavior, PaaS in control.

Fly.io retired its free allowances and legacy hobbies plan for new accounts. New users start on the Hobby plan at $5/month. Existing accounts with the old free allowances were grandfathered but cannot be transferred to new accounts. If you need a free tier with scale-to-zero, compare Railway, Render, and Koyeb.

Fly.io supports managed PostgreSQL and Redis-compatible storage. Postgres databases run as Fly Machines with configurable resources, automated backups, and connection pooling. This makes it a strong choice for full-stack apps that need a database alongside app hosting, similar to Railway or Render.

All three are PaaS platforms. Fly.io gives you the most infrastructure control: full Docker support, microVMs, global regions, custom VPCs. Railway is simpler for getting started with its usage-based model and database hosting. Render has a free tier with scale-to-zero. Choose Fly.io if you need control and edge deployment. Choose Railway for simplicity. Choose Render if a free tier matters.

Fly.io runs in 35 regions across North America, South America, Europe, Africa, and Asia-Pacific, plus a global anycast option. You can deploy your app to specific regions or use global load balancing.

Fly.io supports any language that runs in Docker. Official Docker images cover Elixir, Ruby, Python, JavaScript, Rust, Go, PHP, .NET, Java, Crystal, and Deno. Because you bring your own Dockerfile, anything you can containerize runs on Fly.io. This makes it one of the most language-flexible platforms, alongside Railway and Koyeb.

Not for new accounts. Fly.io retired its free allowances. The Hobby plan starts at $5/month and includes some compute and Postgres resources. If you need a genuine free tier with scale-to-zero, compare Railway, Render, and Koyeb.