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Azure Functions

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Serverless compute for event-driven applications on Azure

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What is Azure Functions?

Azure Functions (api tools): Serverless compute for event-driven applications on Azure. Azure Functions runs your code in response to events without managing servers. HTTP requests, timer schedules, queue messages, database changes—define what triggers your function, and Azure handles the rest. Write functions in C#, JavaScript, Python, or Java. Pay only when code executes. Scaling happens automatically based on demand. Key capabilities: Serverless compute, Event-driven, Multiple languages, Triggers, Bindings. Azure Functions is paid-only, with most plans including a trial period. Buyers most often compare Azure Functions against Vapor, Cleavr, Northflank.

TL;DR - Azure Functions

  • Azure Functions is Microsoft's serverless compute service for event-driven applications
  • It runs code in response to triggers without managing infrastructure
  • Free tier with 1M executions/month, then pay per execution
Pricing: Paid only
Best for: Enterprises & pros
4.4/5 across review platforms

Pros & Cons

Pros

  • Serverless functions
  • Multiple language support
  • Good Azure integration
  • Consumption-based pricing
  • Durable functions

Cons

  • Cold starts
  • Vendor lock-in
  • Debugging complex
  • Execution limits
  • Local development tricky

Ratings Across the Web

4.4(204 reviews)
G2204 reviews
4.4/5

Ratings aggregated from independent review platforms. Learn more

Key Features

Serverless computeEvent-drivenMultiple languagesTriggersBindingsAzure

Pricing Plans

Free Trial

Free Tier

Usage-based pricing

  • 1M executions/month
  • 400,000 GB-seconds
  • Consumption plan
  • All features
Most Popular

Consumption

$0.2/per 1M executions

Pay-as-you-go

  • $0.000016/GB-sec
  • Auto-scaling
  • Pay for usage only
  • Cold starts possible

Flex Consumption

$0.4/per 1M executions

GA 2025

  • Faster cold starts
  • VNet integration
  • Higher concurrency
  • Always-ready option

Premium

Varies

Pre-warmed

  • No cold starts
  • VNET connectivity
  • Unlimited execution
  • Dedicated instances
View full pricing

About Azure Functions

Azure Functions runs your code in response to events without managing servers. HTTP requests, timer schedules, queue messages, database changes—define what triggers your function, and Azure handles the rest. Write functions in C#, JavaScript, Python, or Java. Pay only when code executes. Scaling happens automatically based on demand. Teams building on Azure use Functions for glue code, webhooks, and event processing where spinning up full services would be overkill.
How we evaluate tools →Source: azure.microsoft.com

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Azure Functions FAQ

Is Azure Functions free?

Generous free tier: 1 million executions and 400,000 GB-s per month. Consumption plan charges only for usage. Many apps run free.

What is Azure Functions?

Azure Functions is Microsoft's serverless compute platform. Run code triggered by events without managing servers. Similar to AWS Lambda.

Azure Functions vs AWS Lambda?

Similar capabilities. Azure Functions has better C#/.NET support. Lambda has more triggers and ecosystem. Choose based on your cloud platform.

What languages do Azure Functions support?

C#, JavaScript, TypeScript, Python, Java, PowerShell, and custom handlers. C# has the best integration as expected from Microsoft.

What triggers Azure Functions?

HTTP requests, timers, queues, blobs, Cosmos DB changes, Event Grid, and more. Build event-driven applications. Good integration with Azure services.

Source: azure.microsoft.com

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