Fly.io

Fly.io does not provide built-in managed Redis or MySQL services, requiring developers to provision and manage databases separately or use external providers.

Fly.io does not provide built-in serverless cron job capabilities, forcing developers to implement scheduled tasks using alternative methods or external services.

Fly.io requires developers to understand fly.toml configuration with a steeper learning curve than competing platforms. Documentation is inconsistent, creating confusion during onboarding and troubleshooting.