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Web Development · head to head

Flask vs SolidStart

Flask logo

Flask

Web Development

A lightweight WSGI web application framework

From
Free
Rated
-
Full reviewWebsite
SolidStart logo

SolidStart

Web Development

Full-stack meta-framework for SolidJS with fine-grained reactivity

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Flask requires manual configuration of many common features like authentication, ORM, and admin panels; SolidStart smaller ecosystem compared to Next.js or Remix due to relative newness
  • They diverge on capability: Flask covers Lightweight framework, SolidStart covers Fine-grained reactivity.

Where they differ

Only the attributes on which Flask and SolidStart actually diverge.

Attributes where Flask and SolidStart differ
AttributeFlaskSolidStart
Pricing modelfreeopen-source
PlatformsLinux, macOS, Windows, Cloud (any platform supporting Python)Web
Founded2010Unknown

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

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 Flask

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

Only in SolidStart

  • Fine-grained reactivity
  • Server actions
  • Single-flight mutations
  • Request deduplication
  • Multi-router support
  • Automatic API generation
  • Vite integration

What people use each for

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

Flask

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

SolidStart

  • Building lightweight full-stack applications with minimal runtime overheadnot Flask
  • Projects requiring fine-grained reactivity and automatic dependency trackingnot Flask
  • Applications targeting multiple deployment platforms with single codebasenot Flask
  • Teams prioritizing performance and small bundle sizesnot Flask

Where each one falls short

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

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

SolidStart

  • Smaller ecosystem compared to Next.js or Remix due to relative newness
  • SolidJS less familiar to developers with React experience
  • Community documentation not as extensive as larger frameworks
  • Limited third-party UI component libraries compared to React ecosystem

Pricing, plan by plan

Flask

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

SolidStart

Free

No published plan breakdown. See the SolidStart review.

Which should you pick?

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

Choose SolidStart if

  • You need fine-grained reactivity.
  • You want to start without paying.
  • You also want server actions.
SolidStart review

Questions people ask

Is Flask or SolidStart better?
Neither clearly leads. Flask starts at Free and SolidStart at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Flask or SolidStart?
Flask starts at Free and SolidStart at Free.
Does Flask or SolidStart run on more platforms?
Flask runs on Linux, macOS, Windows, Cloud (any platform supporting Python). SolidStart runs on Web.
Can I use Flask for free?
Both have a free tier, so you can try either at no cost before committing.
What is Flask best used for?
Flask is most often used for rest apis and backend services, small-to-medium web applications and prototypes, microservices, server-rendered apps using jinja templating. Of those, rest apis and backend services and small-to-medium web applications and prototypes are not what SolidStart is typically brought in for.
What can Flask do that SolidStart cannot?
Flask covers Lightweight framework, Jinja2 templating, Werkzeug WSGI toolkit, URL routing. SolidStart covers Fine-grained reactivity, Server actions, Single-flight mutations, Request deduplication.

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
SolidStart: What is SolidJS and how does it differ from React?

SolidJS uses fine-grained reactivity and automatic dependency tracking instead of React's virtual DOM, resulting in smaller bundles and better performance.

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
SolidStart: How many deployment platforms does SolidStart support?

SolidStart supports over 20 deployment platforms including Cloudflare, Netlify, Vercel, Deno, AWS, and Azure through Vite plugins.

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
SolidStart: Can I use TanStack Router with SolidStart?

Yes, SolidStart supports using either the official Solid Router or TanStack Router depending on project requirements.

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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