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Cloud · head to head

Azure Functions vs Heroku

Azure Functions logo

Azure Functions

Cloud

Event-driven serverless compute on Azure

From
Free
Rated
-
Full reviewWebsite
Heroku logo

Heroku

Cloud

Cloud Application Platform

From
$5/month
Rated
-
Full reviewWebsite

The short version

  • Only Azure Functions has a free tier, so it costs nothing to try first.
  • Each has a real cost: Azure Functions consumption plan free grant is capped at 1 million executions and 400,000 GB-seconds of resource consumption per month per subscription, billed per GB-second beyond that; Heroku there is no free dyno tier; the cheapest Eco dyno is $5 per month
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Azure Functions and Heroku actually diverge.

Attributes where Azure Functions and Heroku differ
AttributeAzure FunctionsHeroku
Starting priceFree$5/month
Pricing modelusage-basedsubscription
Free tierYesNo
PlatformsWebWeb, Api, Workers
FoundedUnknown2007

Identical on both: user rating (Not yet rated), category (Cloud).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Azure Functions

Nothing recorded that Heroku does not also cover.

Only in Heroku

  • Git-based deployment
  • Buildpacks
  • Dynos (containers)
  • Add-ons marketplace
  • Postgres database
  • Environment variables
  • Logging
  • API

What people use each for

The jobs each tool is most often brought in to do.

Azure Functions

  • Event-driven computingnot Heroku
  • Serverless application backendnot Heroku
  • Scalable API endpointsnot Heroku

Heroku

  • Application hostingnot Azure Functions
  • Database as a servicenot Azure Functions
  • CI/CD pipelinesnot Azure Functions
  • API deploymentnot Azure Functions

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Azure Functions

  • Consumption plan free grant is capped at 1 million executions and 400,000 GB-seconds of resource consumption per month per subscription, billed per GB-second beyond that
  • The newer Flex Consumption plan's free grant is smaller still, at 250,000 executions and 100,000 GB-seconds per month
  • Premium plan avoids per-execution charges but bills continuously for allocated core seconds and memory regardless of invocation volume
  • Memory is rounded up to the nearest 128 MB and execution time to the nearest 1 ms for billing, so small overages round upward

Heroku

  • There is no free dyno tier; the cheapest Eco dyno is $5 per month
  • Eco dynos sleep after 30 minutes of inactivity, are restricted to personal accounts and allow only 2 process types
  • Free SSL and 10 process types start at the Basic dyno at $7 per month
  • Private and Shield dyno types require a Private Space, which is billed on top of the dynos
  • Private Space dynos start at $250 per month for Private-M and $500 per month for Private-L
  • Dyno prices are per dyno per month, so an app with several process types multiplies the bill

Pricing, plan by plan

Azure Functions

Free
  • Consumption Plan$null/month
    • 1 million requests free monthly
    • 400,000 GB-seconds free monthly
    • Billed per second and executions
  • Flex Consumption Plan$null/month
    • 250,000 executions free monthly
    • 100,000 GB-seconds free monthly
    • Event-driven scaling
  • Premium Plan$null/month
    • No execution charges
    • At least one instance required
    • Includes automatic scaling and VNET access

Heroku

$5/month
  • Eco Dyno$5/month
    • 0.5 GB RAM
    • Git/Docker deploy
    • Custom domains
  • Basic Dyno$7/month
    • 0.5 GB RAM
    • Always-on
    • Free SSL
  • Standard-1X Dyno$25/month
    • 0.5 GB RAM
    • Horizontal scaling
    • App metrics
  • Standard-2X Dyno$50/month
    • 1 GB RAM
    • Horizontal scaling
    • App metrics

Which should you pick?

Choose Azure Functions if

  • You want to start without paying.
Azure Functions review

Choose Heroku if

  • You need git-based deployment.
  • You work on Web, Api, Workers.
  • You also want buildpacks.
Heroku review

Questions people ask

Is Azure Functions or Heroku better?
Neither clearly leads. Azure Functions starts at Free and Heroku at $5/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Azure Functions or Heroku?
Azure Functions has a free tier; the other does not. Paid plans start at Free for Azure Functions and $5/month for Heroku.
Does Azure Functions or Heroku run on more platforms?
Azure Functions runs on Web. Heroku runs on Web, Api, Workers.
Can I use Azure Functions for free?
Yes. Azure Functions has a free tier, so you can try it without paying. Heroku starts at $5/month.
What is Azure Functions best used for?
Azure Functions is most often used for event-driven computing, serverless application backend, scalable api endpoints. Of those, event-driven computing and serverless application backend are not what Heroku is typically brought in for.
What can Azure Functions do that Heroku cannot?
Heroku covers Git-based deployment, Buildpacks, Dynos (containers), Add-ons marketplace.

Answered from the vendors’ own pages

Azure Functions: Does Azure Functions have a free tier?

Yes, Azure Functions includes a monthly free grant of 1 million requests and 400,000 GB-seconds on the Consumption Plan, or 250,000 executions and 100,000 GB-seconds on Flex Consumption.

Source
Heroku: How much does Heroku cost?

Heroku dyno pricing starts at $5 per month USD for the Eco tier (with 30-minute inactivity sleep), $7 per month for Basic (always-on), and scales up to $1,500 per month for Performance-2XL with 126 GB RAM.

Source
Azure Functions: What is Azure Functions' pricing model?

Azure Functions uses usage-based pricing. Consumption plans charge per second of resource consumption and per execution, measured in gigabyte-seconds and rounded to the nearest 128 MB.

Source
Heroku: What is the cheapest always-on Heroku plan?

The Basic Dyno at $7 per month USD is Heroku's cheapest always-on container option. It provides 0.5 GB RAM, free SSL, and support for 10 process types.

Source
Azure Functions: What is the minimum execution time for Azure Functions?

The minimum execution time is 100 milliseconds on Consumption plans. Premium plans charge based on core seconds and allocated memory.

Source
Heroku: How is Heroku Postgres priced?

Heroku Postgres Essential tier (shared resources) starts at $5-$20 per month for 1-32 GB disk. Standard tier (dedicated) ranges $50-$12,000 per month. Premium, Private, Shield, and Advanced tiers offer higher performance at corresponding prices.

Source
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