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Cloud & Infrastructure · head to head

Lambda (AWS Serverless) vs Azure SQL

Lambda (AWS Serverless) logo

Lambda (AWS Serverless)

Cloud & Infrastructure

Run code without thinking about servers

From
Free
Rated
-
Full reviewWebsite
Azure SQL logo

Azure SQL

Database & Data Management

Intelligent, scalable cloud database service from Microsoft

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Lambda (AWS Serverless) billed on two axes at once, $0.20 per million requests plus $0.0000166667 per GB-second of duration, so memory settings change the bill as much as traffic does; Azure SQL ecosystem lock-in limits flexibility compared to open-source or multi-cloud solutions
  • They diverge on capability: Lambda (AWS Serverless) covers Function-as-a-Service, Azure SQL covers Intelligent Performance.

Where they differ

Only the attributes on which Lambda (AWS Serverless) and Azure SQL actually diverge.

Attributes where Lambda (AWS Serverless) and Azure SQL differ
AttributeLambda (AWS Serverless)Azure SQL
Pricing modelusage-basedUnknown
PlatformsWeb, ApiCloud (Microsoft Azure)
CategoryCloud & InfrastructureDatabase & Data Management
Founded20141975

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 Lambda (AWS Serverless)

  • Function-as-a-Service
  • Event-driven execution
  • Auto-scaling
  • Pay-per-use
  • Multiple languages
  • Concurrency limits
  • Dead Letter Queues
  • Environment variables

Only in Azure SQL

  • Intelligent Performance
  • Advanced Security
  • Hyperscale
  • Serverless Compute
  • Geo-replication
  • Automatic Tuning
  • Built-in AI
  • Power BI

Both cover

  • Web support

What people use each for

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

Lambda (AWS Serverless)

  • Event-driven functions without managing serversnot Azure SQL
  • API backends behind API Gatewaynot Azure SQL
  • Processing S3, DynamoDB, SQS and Kinesis eventsnot Azure SQL
  • Scheduled jobs without a always-on instancenot Azure SQL
  • Edge compute through Lambda@Edgenot Azure SQL

Azure SQL

  • Transaction processingnot Lambda (AWS Serverless)
  • Data storagenot Lambda (AWS Serverless)
  • Application backendnot Lambda (AWS Serverless)
  • Reportingnot Lambda (AWS Serverless)
  • Data analyticsnot Lambda (AWS Serverless)

Where each one falls short

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

Lambda (AWS Serverless)

  • Billed on two axes at once, $0.20 per million requests plus $0.0000166667 per GB-second of duration, so memory settings change the bill as much as traffic does
  • Provisioned concurrency, used to avoid cold starts, is charged separately at $0.0000041667 per GB-second whether or not the function runs
  • Ephemeral storage beyond the included 512 MB is metered
  • Lambda@Edge costs $0.60 per million requests, three times the standard request rate
  • VPC use and cross-region data transfer carry EC2 charges on top

Azure SQL

  • Ecosystem lock-in limits flexibility compared to open-source or multi-cloud solutions
  • Managed service reduces control over database configuration and optimization tuning
  • Pricing complexity with consumption-based model can be unpredictable at scale
  • Less operational depth compared to Amazon RDS for advanced scaling scenarios
  • Azure PostgreSQL is less compelling than dedicated PostgreSQL providers outside Azure ecosystem

Pricing, plan by plan

Lambda (AWS Serverless)

Free
  • Free TierFree
    • 1M free requests/month
    • 400,000 GB-seconds/month
    • Always free

Azure SQL

Free

No published plan breakdown. See the Azure SQL review.

Which should you pick?

Choose Lambda (AWS Serverless) if

  • You need function-as-a-service.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want event-driven execution.
Lambda (AWS Serverless) review

Choose Azure SQL if

  • You need intelligent performance.
  • You want to start without paying.
  • You work on Cloud (Microsoft Azure).
  • You also want advanced security.
Azure SQL review

Questions people ask

Is Lambda (AWS Serverless) or Azure SQL better?
Neither clearly leads. Lambda (AWS Serverless) starts at Free and Azure SQL at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Lambda (AWS Serverless) or Azure SQL?
Lambda (AWS Serverless) starts at Free and Azure SQL at Free.
Does Lambda (AWS Serverless) or Azure SQL run on more platforms?
Lambda (AWS Serverless) runs on Web, Api. Azure SQL runs on Cloud (Microsoft Azure).
Can I use Lambda (AWS Serverless) for free?
Both have a free tier, so you can try either at no cost before committing.
What is Lambda (AWS Serverless) best used for?
Lambda (AWS Serverless) is most often used for event-driven functions without managing servers, api backends behind api gateway, processing s3, dynamodb, sqs and kinesis events, scheduled jobs without a always-on instance. Of those, event-driven functions without managing servers and api backends behind api gateway are not what Azure SQL is typically brought in for.
What can Lambda (AWS Serverless) do that Azure SQL cannot?
Lambda (AWS Serverless) covers Function-as-a-Service, Event-driven execution, Auto-scaling, Pay-per-use. Azure SQL covers Intelligent Performance, Advanced Security, Hyperscale, Serverless Compute. Both handle Web support.

Answered from the vendors’ own pages

Azure SQL: Does Azure SQL Database offer a free tier?

Yes, Azure SQL Database includes a permanent free tier that provides 100,000 vCore seconds, 32 GB of data storage, and 32 GB of backup storage per month. This free tier is available for the lifetime of any Azure subscription with no expiration.

Source
Azure SQL: What pricing models does Azure SQL Database support?

Azure SQL Database offers consumption-based pricing where you pay for resources used, with no long-term commitments required. Database Savings Plans launched in March 2026 allow committing to a fixed hourly amount and save up to 35% across Azure database services.

Source
Azure SQL: Is Azure SQL Database compatible with on-premises SQL Server?

Yes, Azure SQL Database shares the same Database Engine as on-premises SQL Server. Existing databases maintain their compatibility level and continue to work after upgrades. Azure SQL Managed Instance provides even broader SQL Server compatibility dating back to SQL Server 2008.

Source
Azure SQL: What high availability features does Azure SQL Database provide?

Azure SQL Database provides automatic backups, geo-replication for disaster recovery, failover groups for automatic failover, and zone redundancy for enhanced availability. The service maintains a 99.99% availability SLA for Business Critical tier.

Source
Azure SQL: Can I use AI features with Azure SQL Database?

Yes, Azure SQL Database includes Copilot for database tasks, Intelligent Applications support, REST API endpoints for building applications, and GraphQL endpoints for modern app development.

Source
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