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Lambda (AWS Serverless) vs Flask

Lambda (AWS Serverless) logo

Lambda (AWS Serverless)

Software

Run code without thinking about servers

From
Free
Rated
-
Full reviewWebsite
Flask logo

Flask

Software

A lightweight WSGI web application framework

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; Flask requires manual configuration of many common features like authentication, ORM, and admin panels
  • They diverge on capability: Lambda (AWS Serverless) covers Function-as-a-Service, Flask covers Lightweight framework.

Where they differ

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

Attributes where Lambda (AWS Serverless) and Flask differ
AttributeLambda (AWS Serverless)Flask
Pricing modelusage-basedfree
PlatformsWeb, ApiLinux, macOS, Windows, Cloud (any platform supporting Python)
Founded20142010

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

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 Flask

  • Lightweight framework
  • Jinja2 templating
  • Werkzeug WSGI toolkit
  • URL routing
  • Request handling
  • Session management
  • Cookie handling
  • Blueprint organization

Both cover

  • Cloud deployment

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 Flask
  • API backends behind API Gatewaynot Flask
  • Processing S3, DynamoDB, SQS and Kinesis eventsnot Flask
  • Scheduled jobs without a always-on instancenot Flask
  • Edge compute through Lambda@Edgenot Flask

Flask

  • REST APIs and backend servicesnot Lambda (AWS Serverless)
  • Small-to-medium web applications and prototypesnot Lambda (AWS Serverless)
  • Microservicesnot Lambda (AWS Serverless)
  • Server-rendered apps using Jinja templatingnot Lambda (AWS Serverless)
  • Teaching and learning web developmentnot 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

Flask

  • Requires manual configuration of many common features like authentication, ORM, and admin panels
  • No built-in admin interface or scaffolding tools
  • Minimal built-in security features compared to full frameworks

Pricing, plan by plan

Lambda (AWS Serverless)

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

Flask

Free
  • Open SourceFree
    • Micro web framework
    • Flexible architecture
    • Jinja2 templating

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 Flask if

  • You need lightweight framework.
  • You want to start without paying.
  • You work on Linux, macOS, Windows, Cloud (any platform supporting Python).
  • You also want jinja2 templating.
Flask review

Questions people ask

Is Lambda (AWS Serverless) or Flask better?
Neither clearly leads. Lambda (AWS Serverless) starts at Free and Flask at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Lambda (AWS Serverless) or Flask?
Lambda (AWS Serverless) starts at Free and Flask at Free.
Does Lambda (AWS Serverless) or Flask run on more platforms?
Lambda (AWS Serverless) runs on Web, Api. Flask runs on Linux, macOS, Windows, Cloud (any platform supporting Python).
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 Flask is typically brought in for.
What can Lambda (AWS Serverless) do that Flask cannot?
Lambda (AWS Serverless) covers Function-as-a-Service, Event-driven execution, Auto-scaling, Pay-per-use. Flask covers Lightweight framework, Jinja2 templating, Werkzeug WSGI toolkit, URL routing. Both handle Cloud deployment.

Answered from the vendors’ own pages

Flask: Is Flask free to use?

Yes. Flask is open-source software released under the BSD-3-Clause License, available free for any use including commercial applications.

Source
Flask: What are Flask's core dependencies?

Flask depends on three main libraries: Werkzeug (WSGI toolkit), Jinja (template engine), and Click (CLI toolkit).

Source
Flask: Does Flask provide built-in database support?

No. Flask is a microframework that does not include built-in database support. Developers must choose and integrate their own database libraries, though Flask-SQLAlchemy is a popular community extension.

Source
Flask: What platforms does Flask support?

Flask is a microframework for Python that runs on any platform that supports Python, including Linux, macOS, Windows, and cloud platforms.

Source
Flask: Can Flask scale to large applications?

Yes. While designed to be lightweight and simple, Flask is designed with the ability to scale up to complex applications through blueprints, extensions, and modular architecture.

Source
Flask: Does Flask require a build step to run?

No. Flask does not require a build step. Applications can run directly with the Flask development server using 'flask run' from the command line.

Source
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