Comparison

Fly.io vs Google App Engine

On the evidence we track, Fly.io leads this comparison with a composite score of 79/100. 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 formatsJSON Markdown GraphQLor send Accept: application/json

★Fly.io79

Google App Engine57

Attribute comparison across 2 tools
Attribute	Fly.ioLeader	Google App Engine
Vioscale score	79 / 100medium · 63%	57 / 100low · 49%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	commercial	freemium
Price levelpricing.price_level	unknown	low
Transparentpricing.transparent	✓	✓
Integrations
Countintegrations.count	5	3
Security
Hipaasecurity.hipaa	✓	-
Iso27001security.iso27001	✓	-
Soc2security.soc2	✓	-
Reliability
Sla pctreliability.sla_pct	99.9	-
Status pagereliability.status_page	✓	✓
Market
Availabilitymarket.availability	Available worldwide · Popular in US	Available worldwide · Popular in US

Score

Vioscale score

Fly.io79 / 100medium · 63%

Google App Engine57 / 100low · 49%

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.io5

Google App Engine3

Security

Hipaa

Fly.io✓

Google App Engine–

Iso27001

Fly.io✓

Google App Engine–

Soc2

Fly.io✓

Google App Engine–

Reliability

Sla pct

Fly.io99.9

Google App Engine–

Status page

Fly.io✓

Google App Engine✓

Market

Availability

Fly.ioAvailable worldwide · Popular in US

Google App EngineAvailable worldwide · Popular in US

Capabilities

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

Capability comparison for 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	✓	✓

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.io-

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

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.

Independently observed

Google App Engine

A fully managed serverless platform for deploying web applications across multiple programming languages with automatic scaling and integrated monitoring and diagnostics.

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 2026-08-01verify ↗

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 2026-08-05verify ↗

Platform & deployment

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

Platform and deployment support comparison
Supports	Fly.io	Google App Engine
WebPlatforms	✓	✓
LinuxPlatforms	✓	✗
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✓	✓

Platforms

Web

Fly.io✓

Google App Engine✓

Linux

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

5 total

Sentry
Supabase
Upstash
LiteFS
Tigris

Independently observed

Google App Engine

3 total

Cloud Monitoring
Cloud Logging
Cloud Run

Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.