CAST AI vs Fly.io
CAST AI
cast.ai
Fly.io
fly.ioSide by side
| Figure | CAST AI | Fly.io |
|---|---|---|
| Price from | — | $2.19/mo |
| Free plan | — | — |
| Free trial | Yes | Yes |
| Open source | — | — |
| Web | Yes | Yes |
| Linux | — | Yes |
| API | — | Yes |
| Self-hosted | Yes | — |
| Plans published | 1 | 6 |
| Spec score · Auto Scaling Software | 7.5 (#8) | 8.0 (#5) |
| Integrations | The integrations page lists Grafana, Terraform, Crossplane, Prometheus, Jira, OpenTelemetry, Helm, and Pulumi. | Sprites Connectors support GitHub and Slack through OAuth, OpenRouter using a supplied key, and custom HTTP APIs and S3-compatible object stores. |
| Product | CAST AI describes itself as an Application Performance Automation platform for cloud-native operations and Kubernetes automation. | Fly.io describes itself as a developer-focused public cloud that is easy to deploy on and designed to grow with applications. |
Plans
Fly.io
- shared-cpu-1x · 256MB Machine$2.19 a month
- Standard Support$29 a month
- Managed Postgres Basic$38 a month
- HIPAA compliance package$99 a month
- Premium Support$199 a month
- Enterprise Support$2,500 a month
In their own words
CAST AI
CAST AI is an Application Performance Automation platform for cloud-native operations and Kubernetes automation. It automates workload rightsizing, node scaling, GPU and Spot optimization, and issue remediation. Rightsizing adjusts CPU and memory requests, limits, and replicas in response to workload behavior. The platform says its engine can predict Spot interruptions up to 30 minutes ahead and migrate workloads before a slowdown. Agentic runbooks can address operational and security issues, with approval required for each change before it ships.
Teams can connect clusters in read-only mode without infrastructure changes. Listed environments include AWS, Google Cloud, Azure, Oracle Cloud, IBM Cloud, OpenShift, Rancher, VMware Tanzu, AliCloud, kOps, PostgreSQL, MySQL, and on-prem Kubernetes. Cost tools include allocation, spend forecasting, rightsizing guidance, and commitment management. CAST AI integrates with tools including Grafana, Terraform, Prometheus, Jira, and Pulumi. It is available on the web and as self-hosted software. Pricing is custom and available on request; a free trial is available.