Fly.io
Heroku
Fly.io
Heroku
Fly.io
Heroku
No signals
Fly.io
Heroku
Fly.io
Heroku
Fly.io
No signals
Heroku
Users: 1 user
Storage: 3GB
Limits: Community support only, No billing alerts, Free allowances don't cap bills
Users: Unlimited
Storage: Usage-based
Limits: No priority support, No SLA, Complex pricing to predict
Users: Per org
Storage: Usage-based
Limits: Usage costs can still spiral unexpectedly
Users: Custom
Storage: Custom
Limits: Must negotiate pricing, Long contract terms typical
Users: N/A
Storage: N/A
Limits: Sleeping dynos, not suitable for production, no custom domains on some plans
Users: N/A
Storage: N/A
Limits: No memory scaling, no autoscaling, basic monitoring only
Users: N/A
Storage: N/A
Limits: Still single-tenant, no dedicated resources
Users: N/A
Storage: N/A
Limits: Still limited compared to raw cloud VMs at similar prices
| Feature | Fly.io | Heroku |
|---|---|---|
| Performance | ||
| Global edge deployment 35+ regions | ||
| Auto-scaling | ||
| Deployment | ||
| Git Push Deployment Heroku pioneered this | ||
| Container Support Docker support | ||
| Infrastructure | ||
| Firecracker micro-VMs | ||
| Pricing | ||
| Per-second billing | ||
| Free Tier Removed Nov 2022 | ||
| Billing alerts Not supported | ||
| Databases | ||
| Managed Redis $3/mo start | ||
| Managed Postgres Reliability issues reported | ||
| Networking | ||
| Private networking WireGuard | ||
| Custom domains | ||
| Integrations | ||
| Add-on Marketplace Extensive options | ||
| CI/CD | ||
| Review Apps | ||
| Features | ||
| GPU support For ML workloads | ||
| Built-in queues/workers Manual setup required | ||
| Scaling | ||
| Autoscaling Standard+ only | ||
| Platform | ||
| New Features Development Sustaining mode Feb 2026 | ||
| Availability | ||
| Always-On ($5) Eco dynos sleep | ||
