Let's try to compare Azure App Services, Azure Functions, and AWS Lambda. The following table may not contain all the points:
Azure App Services | Azure Functions | AWS Lambda | |
Category | Platform as a Service. | Allows you to develop serverless applications on Microsoft Azure. | Allows you to develop serverless applications on AWS. |
Definition | Microsoft Azure App Service is a PaaS offering. We can create web and mobile apps for any platform or device. | Azure Functions is a service provided by Microsoft to run small pieces of code, or functions, in the Microsoft Azure cloud. We only need to focus on the problem and not the resources required for the solution. | AWS Lambda allows us to execute code in serverless architecture, where the resources are managed by AWS. |
Vendor | Microsoft Azure. | Microsoft Azure. | Amazon/AWS. |
Available from | 2015. | 2016. | 2014. |
Languages Supported | ASP.NET, Node.js, Java, PHP, and Python. | C#, F#, Node.js, Python, PHP, batch, bash, or any executable. | Node.js (JavaScript), Python, Java (Java 8 compatible), and C# (.NET Core). |
Integrated development environment support | Yes (Microsoft Visual Studio IDE). | Yes (Visual Studio). | Yes (Eclipse IDE and Visual Studio IDE). |
Environment variables support | Yes, in Application Settings. | Yes. | Yes. |
Cost | App Service plan can be hosted are FREE (try for free), SHARED (host basic apps), BASIC (more features for Dev / Test), STANDARD (go live with web and mobile), and PREMIUM (enterprise scale and integration). For more details go to https://azure.microsoft.com/en-in/pricing/details/app-service/. | Consumption plan means that when we execute functions, Microsoft Azure provides all the resources. We don't need to worry about resource management, and we only pay for the time that our function runs. For more details go to https://azure.microsoft.com/en-in/pricing/details/functions/. | The Lambda free tier includes 1M free requests per month and 400,000 GB-seconds of compute time per month. The first 1 million requests per month are free and $0.20 per 1 million requests thereafter ($0.0000002 per request). For more details go to https://aws.amazon.com/lambda/pricing/. |
Eligible for free tier | Yes. | Yes. | Yes. |
Flexibility in configuration of resources | Yes. | Limited. (If App Service plan is used then configuration of resources is available.) | No (need to verify). |
Execution time | N/A. | Azure Function must complete execution within 300 seconds. | AWS Lambda function must complete execution within 300 seconds. |
Limit to the number of functions that can be executed | N/A. | No. | No. |
Concurrent executions | N/A. | No limit. | By default, AWS Lambda limits the total concurrent executions across all functions within a given region to 1000. |
Scalability | Manual and automatic scaling available in the form of an App Service plan. | Manual and automatic scaling has two plans available for costing; a Consumption plan and an App Service plan. For more details, check the Cost section in this comparison table. | Automatic scaling. |
Monitoring | Azure App Insights / Azure App Service Default Monitoring. | N/A | Amazon CloudWatch console or AWS Lambda console. |
Templates | Web Web + SQL Web Apps Mobile Apps Logic Apps Media services Blogs + CMSs Starter web apps Web app frameworks Ecommerce Add-ons | BlobTrigger EventHubTrigger Generic Webhook GitHub Webhook HTTPTrigger QueueTrigger ServiceBusQueueTrigger ServiceBusTopicTrigger TimerTrigger | Blank function kinesis-firehose-syslog-to-json alexa-skill-kit-sdk-factskill batch-get-job-python27 kinesis-firehose-apachelog-to-json cloudfront-modify-response-heade s3-get-object-python config-rule-change-triggered lex-book-trip-python |
Supported event sources /integrations | N/A. | Azure Cosmos DB Azure Event Hubs Azure Mobile Apps (tables) Azure Notification Hubs Azure Service Bus (queues and topics) Azure Storage (blob, queues, and tables) GitHub (Webhooks) On-premises (using Service Bus) Twilio (SMS messages) | Amazon S3 Amazon DynamoDB Amazon Kinesis Streams Amazon Simple Notification Service Amazon Simple Email Service Amazon Cognito AWS CloudFormation Amazon CloudWatch Logs Amazon CloudWatch Events AWS CodeCommit Scheduled Events (powered by Amazon CloudWatch Events) AWS Config Amazon Alexa Amazon Lex Amazon API Gateway Other Event Sources: Invoking a Lambda Function On Demand Sample Events Published by Event Sources |
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