Keel vs Fly.io

Fly.io is a hosted application platform with its own infrastructure and tooling. Keel provides a command-line deployment workflow for AWS resources in your account. Choose based on whether you prefer Fly's platform or direct access to AWS services and billing.

Side by side

	Keel	Fly.io
Where your app runs	Your AWS account	Their platform
What you're learning	AWS, used everywhere	Fly-specific tooling
What you pay	AWS prices, direct	Their rates, on their infrastructure
AWS credits and discounts	Apply in full	Can't be used
Reaching your existing AWS	It's already there	Over the public internet
AWS services — S3, SQS, IAM, Cognito	Available and wired to your app	Not available to you
If you leave	Ordinary AWS, still running	Rebuild somewhere else

Build on what your team already knows

Keel creates standard AWS resources: an RDS database, an Application Load Balancer, and CloudWatch logs, among others.

Teams with AWS experience can inspect and operate those resources directly.

The whole AWS toolbox, not a subset

Keel can bind services to AWS resources such as queues and object storage with scoped IAM. The broader AWS catalog remains available when an application needs services outside Keel's built-in resource types.

Pay AWS, not a platform

keel cost     # what your app will cost, before you build it

Keel adds no usage margin to AWS. Eligible AWS credits and discounts apply to the resources it creates.

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