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Cloud · head to head

Azure Functions vs Koyeb

Azure Functions logo

Azure Functions

Cloud

Event-driven serverless compute on Azure

From
Free
Rated
-
Full reviewWebsite
Koyeb logo

Koyeb

Cloud

High-performance serverless infrastructure for APIs, inference, and databases

From
$29/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; Koyeb pricing starts at $29/month with additional compute costs

Where they differ

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

Attributes where Azure Functions and Koyeb differ
AttributeAzure FunctionsKoyeb
Starting priceFree$29/month
Pricing modelusage-basedUnknown
Free tierYesNo
PlatformsWebWeb, CLI, API

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 Koyeb does not also cover.

Only in Koyeb

  • Serverless containers
  • GPU support
  • Global distribution
  • Multi-protocol support
  • Serverless Postgres
  • Zero-downtime deployments

What people use each for

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

Azure Functions

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

Koyeb

  • Deploying AI inference models globally with GPU accelerationnot Azure Functions
  • Building SaaS platforms with automatic scalingnot Azure Functions
  • Running distributed AI agents and background workersnot 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

Koyeb

  • Pricing starts at $29/month with additional compute costs
  • GPU compute is expensive at $0.75-$2.50 per hour
  • Limited customization for infrastructure configuration

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

Koyeb

$29/month
  • Pro$29/month
    • $10 included compute
    • 10 users
    • 100 services
  • Scale$299/month
    • $100 included compute
    • 50 users
    • 1,000 services
  • Enterprise$1000/month
    • Unlimited users
    • Custom resources
    • SSO/RBAC

Which should you pick?

Choose Azure Functions if

  • You want to start without paying.
Azure Functions review

Choose Koyeb if

  • You need serverless containers.
  • You work on Web, CLI, API.
  • You also want gpu support.
Koyeb review

Questions people ask

Is Azure Functions or Koyeb better?
Neither clearly leads. Azure Functions starts at Free and Koyeb at $29/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Azure Functions or Koyeb?
Azure Functions has a free tier; the other does not. Paid plans start at Free for Azure Functions and $29/month for Koyeb.
Does Azure Functions or Koyeb run on more platforms?
Azure Functions runs on Web. Koyeb runs on Web, CLI, API.
Can I use Azure Functions for free?
Yes. Azure Functions has a free tier, so you can try it without paying. Koyeb starts at $29/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 Koyeb is typically brought in for.
What can Azure Functions do that Koyeb cannot?
Koyeb covers Serverless containers, GPU support, Global distribution, Multi-protocol support.

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
Koyeb: What are Koyeb's subscription plans?

Pro plan is $29/month with $10 included compute, Scale plan is $299/month with $100 included compute and 99.9% SLA, and Enterprise starts at $1,000/month with unlimited users and 99.99% SLA.

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
Koyeb: How much does GPU compute cost?

GPU pricing is per-second: RTX-A6000 costs $0.75/hour, A100 costs $1.60/hour, H100 costs $2.50/hour, and 8x H100 costs $20.00/hour.

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
Koyeb: What database options are available?

Koyeb offers serverless Postgres starting at free (0.25 vCPU, 1GB RAM) up to 3XL at $1.28/hour with 8 vCPU and 32GB RAM. Storage costs $0.50/month per GB.

Source
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