vioscaleAI
Comparison

Fly.io vs Google App Engine

On the evidence we track, Fly.io leads this comparison with a composite score of 71/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Fly.io full profile →Google App Engine full profile →
Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
★Fly.io71
Google App Engine55
Score
vioscaleAI score
Fly.io71 / 100medium · 63%
Google App Engine55 / 100low · 48%
Pricing
Free tier
Fly.io✓
Google App Engine✓
Model
Fly.iocommercial
Google App Enginefreemium
Price level
Fly.iounknown
Google App Enginelow
Transparent
Fly.io✗
Google App Engine✓
Integrations
Count
Fly.io4
Google App Engine3
Security
Hipaa
Fly.io✓
Google App Engine–
Iso27001
Fly.io✓
Google App Engine–
Soc2
Fly.io✓
Google App Engine–
Trust center
Reliability
Sla pct
Fly.io99.9
Google App Engine–
Status page
Fly.io✓
Google App Engine✓
Market
Availability
Content
Faq
Fly.io7 items
Google App Engine6 items

Capabilities

Feature-by-feature on the axes that matter for paas & hosting. “-” means undocumented, not absent.

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

What each one is

The product in its own terms, so the numbers below have context.

Fly.io

Leader

A cloud service offering hardware-isolated Linux virtual machines optimized for running AI agents and tools, featuring persistent storage, checkpoint and rollback capabilities, and API gateway-based credential management.

Independently observed

Google App Engine

A managed cloud platform that automatically handles server deployment and scaling, allowing developers to deploy applications without managing underlying infrastructure or configuration.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Fly.io

Leader
from $29/moUsage-based

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.

  • 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
as of verify ↗

Google App Engine

Usage-basedFree tier

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.

  • B1Free
  • B2Free
  • B4Free
  • B4_1GFree
  • B8Free
  • F1Free
  • F2Free
  • F4Free
  • F4_1GFree
as of verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platforms
Web
Fly.io✗
Google App Engine✓
CLI
Fly.io✓
Google App Engine✓
Deployment
Cloud / SaaS
Fly.io✓
Google App Engine✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

Fly.io

Leader
9 total
  • Sentry
  • Supabase
  • Upstash
  • LiteFS
  • Tigris
  • OpenRouter
  • GitHub
  • Slack
  • HTTP API
Independently observed

Google App Engine

3 total
  • Cloud Monitoring
  • Cloud Logging
  • Cloud Run
Independently observed
Still deciding?

Fly.io or Google App Engine: 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.