Caddy vs Fly.io
On the evidence we track, Fly.io leads this comparison with a composite score of 77/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.
Features
The capabilities each product documents. These tools do not share a category taxonomy, so this aligns what each vendor states rather than a normalised feature set.
| Feature | Caddy | Fly.io |
|---|---|---|
| Automatic https acme | ✓ | - |
| Automatic tls acme | ✓ | - |
| Build system | - | dockerfile |
| Builtin caching | ✓ | - |
| Cli and api | - | ✓ |
| Clustering ha | ✓ | - |
| Container deploy | - | ✓ |
| Custom domains tls | - | ✓ |
| Dynamic config discovery | ✓ | - |
| Env secrets | - | ✓ |
| Hosting | - | cloud |
| Hot config reload | ✓ | - |
| Http caching | ✓ | - |
| License model | open-source | - |
| Load balancing | ✓ | - |
| Managed databases | - | ✓ |
| Module extensibility | compiled plugins | - |
| Native app execution | module-embedded | - |
| Rate limiting | ✓ | - |
| Regions | - | multi |
| Reverse proxy | ✓ | - |
| Runtimes | - | Docker containers, Node.js, Deno, and other containerized runtimes |
| Tls termination | ✓ | - |
| Waf support | ✓ | - |
| Zero downtime reload | ✓ | - |
What each one is
The product in its own terms, so the numbers below have context.
Caddy
A multi-platform web server that automatically handles HTTPS/TLS provisioning for websites without manual certificate management. It serves as an HTTP reverse proxy with load balancing, dynamic routing, health checking, and REST-based configuration management.
Fly.io
LeaderA cloud platform that deploys Docker containers as isolated virtual machines across global data centers. Supports multiple programming languages and frameworks, plus Sprites, a specialized offering for AI agents and development tools.
Pricing
List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.
Caddy
Free and open-source; optional paid sponsorship for business support
- CommunityFree
- SponsorContact sales
Fly.io
LeaderUsage-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
Platform & deployment
Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.
Integrations
What each product connects to. Counts come from the vendor's own integration directory where one exists.
Caddy
- Cloudflare
- Google Cloud DNS
- TencentCloud DNS
- Docker
- Kubernetes
- Consul
- CrowdSec
- Umami
- Bunny CDN
- OAuth 2.0
- LDAP
- OpenID Connect
- SAML
- Google Cloud KMS
- etcd
- AWS
Fly.io
Leader- Sentry
- Supabase
- Upstash
- LiteFS
- Tigris
- OpenRouter
- GitHub
- Slack
Caddy or Fly.io: 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.