---
id: flask-openapi3-scalar
version: "1.44.15"
license: MIT
license_treatment: permissive
maintenance: active
---

# flask-openapi3-scalar — Provide Scalar UI for flask-openapi3.

License: permissive · Maintenance: active · Downloads: 87.6K/mo

## What it is and what it does

flask-openapi3-scalar is a UI plugin that adds Scalar-based interactive documentation to Flask applications using flask-openapi3. It sits on top of flask-openapi3 and provides an alternative to other UI templates like Swagger, Redoc, or RapiDoc for visualizing and testing your API endpoints.

The package is lightweight and installs with minimal friction—just flask-openapi3 as a runtime dependency. It's actively maintained, supports Python 3.8 and later, and carries no known security vulnerabilities. Use it when you want Scalar's particular design and interaction model for your API documentation instead of the other available UI options.

Use it for:

- Add an interactive, browser-based API explorer to a Flask REST API without writing custom documentation
- Replace or supplement Swagger UI with Scalar's interface for a different user experience
- Provide developers with a live testing environment for your OpenAPI-documented endpoints
- Serve multiple UI templates from the same Flask app by installing different flask-openapi3 UI plugins

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides Scalar UI integration for flask-openapi3, enabling interactive API documentation and testing through a Scalar-based web interface.

Yes, if you are already using flask-openapi3 and prefer Scalar's UI design over alternatives like Swagger or Redoc. Install friction is minimal, maintenance is active, and the MIT license poses no restrictions. No known vulnerabilities. Not worth installing if you don't need interactive API documentation or have already chosen a different UI template.

## Install

pip install flask-openapi3-scalar
uv add flask-openapi3-scalar
poetry add flask-openapi3-scalar

## Installing flask-openapi3-scalar

Before you install: Installs cleanly with a single runtime dependency (flask-openapi3). Actively maintained with recent commits and a stable production release status.

License in practice: MIT license permits free use, modification, and distribution with minimal restrictions—suitable for both open-source and commercial projects.

Quickstart:

pip install flask-openapi3-scalar

from flask import Flask
from flask_openapi3 import OpenAPI

app = OpenAPI(__name__)

# Your OpenAPI-decorated routes here

if __name__ == '__main__':
    app.run()

Requires flask-openapi3 to be installed; Scalar UI is an optional plugin that must be explicitly installed.

Verify before relying:

- Whether Scalar UI offers feature parity with other UI options (Swagger, Redoc, RapiDoc) listed in the parent project
- Performance characteristics when serving large or complex OpenAPI schemas

## Package facts

- License: MIT (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 87.6K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

openapi ui for flask, scalar api documentation, flask api explorer, interactive openapi interface, api documentation ui plugin, flask openapi visualization, api-documentation, openapi-ui

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