vioscale
Comparison

Fly.io vs Heroku

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 →Heroku full profile →
Machine formatsJSONMarkdownGraphQLor send Accept: application/json
★Fly.io79
Heroku60
Score
Vioscale score
Fly.io79 / 100medium · 63%
Heroku60 / 100low · 48%
Pricing
Free tier
Fly.io✓
Heroku–
Model
Price level
Fly.iounknown
Heroku–
Transparent
Fly.io✓
Heroku–
Integrations
Count
Fly.io5
Heroku3
Security
Disclosure policy
Fly.io–
Heroku✓
Hipaa
Fly.io✓
Heroku–
Iso27001
Fly.io✓
Heroku✓
Pci
Fly.io–
Heroku✓
Soc2
Fly.io✓
Heroku✓
Reliability
Sla pct
Fly.io99.9
Heroku–
Status page
Fly.io✓
Heroku✓
Market
Availability

Capabilities

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

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

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

Heroku

A cloud-based application platform that enables developers to build, run, and scale web applications using managed infrastructure and integrated deployment tools. Supports multiple programming languages and frameworks with Git-based deployment.

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 ↗

Heroku

Pricing not documented yet.

Platform & deployment

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

Platforms
Web
Fly.io✓
Heroku✓
Linux
Fly.io✓
Heroku✗
CLI
Fly.io✓
Heroku✓
Deployment
Cloud / SaaS
Fly.io✓
Heroku✓

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

Heroku

3 total
  • GitHub
  • Twilio
  • Salesforce
Independently observed

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