# Fly.io vs Google App Engine

**Leader by Vioscale score:** Fly.io

| Attribute | Fly.io | Google App Engine |
|---|---|---|
| **Vioscale score** | 79 (63% (medium)) | 56.7 (49% (low)) |
| deployment.options | `{"cloud":true}` | `{"cloud":true}` |
| description.long | Fly.io Sprites are dedicated virtual machines that provide hardware-isolated Linux environments for AI agents, tools, and evaluations. They feature persistent block storage that survives sleep cycles, automatic checkpointing, and support for executing untrusted code with configurable network policies. | A fully managed serverless platform for deploying web applications across multiple programming languages with automatic scaling and integrated monitoring and diagnostics. |
| features.capabilities | `{"hosting":"cloud","regions":"multi","runtimes":"Docker containers, Node.js, Deno, and other containerized runtimes","cli_and_api":true,"build_system":"dockerfile","container_deploy":true,"managed_databases":true,"custom_domains_tls":true}` | `{"hosting":"cloud","regions":"multi","runtimes":"Node.js, Java, Ruby, C#, Go, Python, PHP","rollbacks":true,"autoscaling":"horizontal","cli_and_api":true,"env_secrets":true,"custom_domains_tls":true}` |
| integrations.count | 5 | 3 |
| integrations.list | `[{"name":"Sentry"},{"name":"Supabase"},{"name":"Upstash"},{"name":"LiteFS"},{"name":"Tigris"}]` | `[{"name":"Cloud Monitoring"},{"name":"Cloud Logging"},{"name":"Cloud Run"}]` |
| market.availability | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` | `{"primaryMarkets":["US"],"availabilityScope":"global","availableCountries":[],"notAvailableCountries":[]}` |
| platform.support | `{"cli":true,"web":true,"linux":true}` | `{"cli":true,"web":true}` |
| pricing | `{"type":"usage","plans":[{"free":false,"name":"Pay-as-You-Go","summary":"Pay only for what you use","features":["Micro VMs","Persistent storage","Private networking","Unlimited users per organization"],"description":"Usage-based pricing for Micro VMs and persistent storage","contactSales":false},{"free":false,"name":"Serious Support","summary":"Starting at $29/month","features":["Dedicated support team"],"commitment":"monthly","components":[{"kind":"fixed","amount":29,"period":"month","currency":"USD"}],"description":"Access to dedicated team of engineers","contactSales":false},{"free":false,"name":"HIPAA Compliance","summary":"$99/month","features":["HIPAA-compliant workloads","BAAs","SOC2 certification"],"commitment":"monthly","components":[{"kind":"fixed","amount":99,"period":"month","currency":"USD"}],"description":"Compliance package for HIPAA-regulated workloads","contactSales":false},{"free":false,"name":"Machine Reservation","summary":"Save 40% with upfront commitment","features":["40% discount vs pay-as-you-go"],"commitment":"annual","description":"Prepay for infrastructure and receive 40% discount","contactSales":false},{"free":false,"name":"Enterprise","summary":"Contact sales for pricing","features":["Custom resource configurations","SLA requirements","Emergency support"],"description":"Custom solutions for larger workloads with SLA requirements","contactSales":true}],"summary":"Usage-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.","currency":"USD","sourceUrl":"https://fly.io","retrievedAt":"2026-08-01T15:17:23.873Z","startingPrice":{"amount":29,"period":"month","currency":"USD"},"billingPeriods":["month"]}` | `{"type":"usage","plans":[{"free":true,"name":"B1","summary":"$0.05/hour after 9 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.05,"currency":"USD"}],"description":"Backend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"9"}},{"free":true,"name":"B2","summary":"$0.10/hour after 9 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.1,"currency":"USD"}],"description":"Backend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"9"}},{"free":true,"name":"B4","summary":"$0.20/hour after 9 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.2,"currency":"USD"}],"description":"Backend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"9"}},{"free":true,"name":"B4_1G","summary":"$0.30/hour after 9 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.3,"currency":"USD"}],"description":"Backend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"9"}},{"free":true,"name":"B8","summary":"$0.40/hour after 9 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.4,"currency":"USD"}],"description":"Backend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"9"}},{"free":true,"name":"F1","summary":"$0.05/hour after 28 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.05,"currency":"USD"}],"description":"Frontend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"28"}},{"free":true,"name":"F2","summary":"$0.10/hour after 28 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.1,"currency":"USD"}],"description":"Frontend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"28"}},{"free":true,"name":"F4","summary":"$0.20/hour after 28 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.2,"currency":"USD"}],"description":"Frontend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"28"}},{"free":true,"name":"F4_1G","summary":"$0.30/hour after 28 free hours per day","components":[{"per":{"qty":1,"unit":"hour"},"kind":"metered","amount":0.3,"currency":"USD"}],"description":"Frontend instance","contactSales":false,"includedLimits":{"free_hours_per_day":"28"}}],"addOns":[{"name":"Outgoing Network Traffic","components":[{"per":{"qty":1,"unit":"gibibyte"},"kind":"metered","amount":0.138948,"currency":"USD"}]}],"summary":"Free tier: 29 hours F1 instances + 9 hours B1 instances per day, 1 GB outbound data per day. $300 free credits available. Usage-based pricing from $0.05–$0.40/hour depending on instance class.","currency":"USD","freeTier":true,"sourceUrl":"https://cloud.google.com/appengine","retrievedAt":"2026-08-05T13:06:35.526Z","billingPeriods":["month"]}` |
| pricing.free_tier | yes | yes |
| pricing.model | commercial | freemium |
| pricing.price_level | unknown | low |
| pricing.transparent | yes | yes |
| reliability.sla_pct | 99.9 | - |
| reliability.status_page | yes | yes |
| security.hipaa | yes | - |
| security.iso27001 | yes | - |
| security.soc2 | yes | - |

## Capabilities (PaaS & Hosting)

| Capability | Fly.io | Google App Engine |
|---|:--:|:--:|
| **Deploy** |  |  |
| Git-push auto-deploy | - | - |
| Deploy arbitrary container image | ✓ | - |
| Per-PR preview environments | - | - |
| **Build** |  |  |
| Build system | Dockerfile | - |
| Runtime / language breadth | Docker containers, Node.js, Deno, and other containerized runtimes | Node.js, Java, Ruby, C#, Go, Python, PHP |
| **Scale** |  |  |
| Autoscaling | - | Horizontal |
| **Deployment** |  |  |
| Geographic reach | Multi-region | Multi-region |
| Hosting | Cloud only | Cloud only |
| **Data** |  |  |
| Bundled managed data services | ✓ | - |
| **Delivery** |  |  |
| Built-in global CDN / edge | - | - |
| Custom domains + automatic TLS | ✓ | ✓ |
| **Ops** |  |  |
| Env vars & secrets management | - | ✓ |
| Instant rollbacks | - | ✓ |
| **Extensibility** |  |  |
| CLI + deploy API | ✓ | ✓ |

*Source: Vioscale. Generated 2026-09-01T17:03:24.712Z. "-" = undocumented, not absent.*