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Cloud Computing · head to head

Azure Functions vs Flask

Azure Functions logo

Azure Functions

Cloud Computing

Event-driven serverless compute on Azure

From
On request
Rated
-
Full reviewWebsite
Flask logo

Flask

Web Development

A lightweight WSGI web application framework

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only Flask 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; Flask requires manual configuration of many common features like authentication, ORM, and admin panels

Where they differ

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

Attributes where Azure Functions and Flask differ
AttributeAzure FunctionsFlask
Starting priceOn requestFree
Pricing modelsubscriptionfree
Free tierNoYes
PlatformsWebLinux, macOS, Windows, Cloud (any platform supporting Python)
CategoryCloud ComputingWeb Development
FoundedUnknown2010

Identical on both: 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 Azure Functions

Nothing recorded that Flask does not also cover.

Only in Flask

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

What people use each for

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

Azure Functions

No use cases recorded yet. See the Azure Functions review.

Flask

  • REST APIs and backend servicesnot Azure Functions
  • Small-to-medium web applications and prototypesnot Azure Functions
  • Microservicesnot Azure Functions
  • Server-rendered apps using Jinja templatingnot Azure Functions
  • Teaching and learning web developmentnot 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

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

Azure Functions

On request

No published plan breakdown. See the Azure Functions review.

Flask

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

Which should you pick?

Choose Azure Functions if

Nothing in the data separates Azure Functions from Flask on the points above - pick on price and on how each one feels to use.

Azure Functions 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 Azure Functions or Flask better?
Neither clearly leads. Azure Functions starts at On request and Flask at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Azure Functions or Flask?
Flask has a free tier; the other does not. Paid plans start at On request for Azure Functions and Free for Flask.
Does Azure Functions or Flask run on more platforms?
Azure Functions runs on Web. Flask runs on Linux, macOS, Windows, Cloud (any platform supporting Python).
Can I use Flask for free?
Yes. Flask has a free tier, so you can try it without paying. Azure Functions starts at On request.
What can Azure Functions do that Flask cannot?
Flask covers Lightweight framework, Jinja2 templating, Werkzeug WSGI toolkit, URL routing.

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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