vioscaleAI
Comparison

Fly.io vs Heroku

No clear leader: Fly.io (70.5) and Heroku (67.1) are within the 5-point margin; treat as a tie. The attribute-by-attribute breakdown below, with a source and date on every value, is the honest way to compare them.

Fly.io full profile →Heroku full profile →
Machine formatsMarkdownJSONGraphQLMarkdown is open. JSON and GraphQL need a free key.
Fly.io71
Heroku67
Score
vioscaleAI score
Fly.io71 / 100medium · 63%
Heroku67 / 100medium · 73%
Pricing
Free tier
Fly.io✓
Heroku✓
Model
Fly.iocommercial
Herokufreemium
Price level
Fly.iounknown
Herokuhigh
Starting price
Fly.io–
Heroku$500
Transparent
Fly.io✗
Heroku✓
Integrations
Count
Fly.io4
Heroku6
Security
Disclosure policy
Fly.io–
Heroku✓
Hipaa
Fly.io✓
Heroku✓
Iso27001
Fly.io✓
Heroku✓
Pci
Fly.io–
Heroku✓
Soc2
Fly.io✓
Heroku✓
Trust center
Reliability
Sla pct
Fly.io99.9
Heroku–
Status page
Fly.io✓
Heroku✓
Market
Availability
Content
Faq
Fly.io7 items
Heroku6 items

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.ioHorizontal
HerokuHorizontal
Deployment
Geographic reach
Fly.ioMulti-region
HerokuMulti-region
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

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

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

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

from $500/moSubscriptionFree tier

From $7/month for hobby tier, with free tier available

  • freeFree
  • hobby$7/dyno/mo
  • standard-1x$25/dyno/mo
  • standard-2x$50/dyno/mo
  • performance$500/mo
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✗
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.

In common (1)
  • GitHub

Fly.io

9 total - 8 not shared
  • Sentry
  • Supabase
  • Upstash
  • LiteFS
  • Tigris
  • OpenRouter
  • Slack
  • HTTP API
Independently observed

Heroku

7 total - 6 not shared
  • Twilio
  • Salesforce
  • Travis CI
  • RabbitMQ
  • Apigee
  • Heroku Postgres
Independently observed
Still deciding?

Fly.io or Heroku: 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.