Reflex is a library to build full-stack web apps in pure Python. Key features: * *Pure Python* - Write your app's frontend and backend all in Python, no need to learn Javascript. * *Full Flexibility* - Reflex is easy to get started with, but can also scale to complex apps. * *Deploy Instantly* - After building, deploy your app with a https://reflex.dev/docs/hosting/deploy-quick-start/[single command] or host it on your own server. See our https://reflex.dev/blog/2024-03-21-reflex-architecture/#the-reflex-architecture[architecture page] to learn how Reflex works under the hood.

Open a terminal and run (Requires Python 3.10+): [,bash] ---- pip install reflex ----

Installing `reflex` also installs the `reflex` command line tool. Test that the install was successful by creating a new project. (Replace `my_app_name` with your project name): [,bash] ---- mkdir my_app_name cd my_app_name reflex init ---- This command initializes a template app in your new directory. You can run this app in development mode: [,bash] ---- reflex run ---- You should see your app running at http://localhost:3000. Now you can modify the source code in `my_app_name/my_app_name.py`. Reflex has fast refreshes so you can see your changes instantly when you save your code.

Let's go over an example: creating an image generation UI around https://platform.openai.com/docs/guides/images/image-generation?context=node[DALL·E]. For simplicity, we just call the https://platform.openai.com/docs/api-reference/authentication[OpenAI API], but you could replace this with an ML model run locally.     Here is the complete code to create this. This is all done in one Python file! [,python] ---- import reflex as rx import openai openai_client = openai.OpenAI() class State(rx.State): """The app state.""" prompt = "" image_url = "" processing = False complete = False def get_image(self): """Get the image from the prompt.""" if self.prompt == "": return rx.window_alert("Prompt Empty") self.processing, self.complete = True, False yield response = openai_client.images.generate( prompt=self.prompt, n=1, size="1024x1024" ) self.image_url = response.data[0].url self.processing, self.complete = False, True def index(): return rx.center( rx.vstack( rx.heading("DALL-E", font_size="1.5em"), rx.input( placeholder="Enter a prompt..", on_blur=State.set_prompt, width="25em", ), rx.button( "Generate Image", on_click=State.get_image, width="25em", loading=State.processing ), rx.cond( State.complete, rx.image(src=State.image_url, width="20em"), ), align="center", ), width="100%", height="100vh", )

app = rx.App() app.add_page(index, title="Reflex:DALL-E") ----

[cols=5*] |=== | 📑 https://reflex.dev/docs/getting-started/introduction[Docs]   |   🗞️ https://reflex.dev/blog[Blog]   |   📱 https://reflex.dev/docs/library[Component Library]   |   🖼️ https://reflex.dev/templates/[Templates]   |   🛸 https://reflex.dev/docs/hosting/deploy-quick-start[Deployment]   |===

Reflex launched in December 2022 with the name Pynecone. 🚀 Introducing https://build.reflex.dev/[Reflex Build] -- Our AI-Powered Builder Reflex Build uses AI to generate complete full-stack Python applications. It helps you quickly create, customize, and refine your Reflex apps -- from frontend components to backend logic -- so you can focus on your ideas instead of boilerplate code. Whether you're prototyping or scaling, Reflex Build accelerates development by intelligently scaffolding and optimizing your app's entire stack. Alongside this, https://cloud.reflex.dev[Reflex Cloud] launched in 2025 to offer the best hosting experience for your Reflex apps. We're continuously improving the platform with new features and capabilities. Reflex has new releases and features coming every week! Make sure to :star: star and :eyes: watch this repository to stay up to date.

We welcome contributions of any size! Below are some good ways to get started in the Reflex community. * *Join Our Discord*: Our https://discord.gg/T5WSbC2YtQ[Discord] is the best place to get help on your Reflex project and to discuss how you can contribute. * *GitHub Discussions*: A great way to talk about features you want added or things that are confusing/need clarification. * *GitHub Issues*: https://github.com/reflex-dev/reflex/issues[Issues] are an excellent way to report bugs. Additionally, you can try and solve an existing issue and submit a PR. We are actively looking for contributors, no matter your skill level or experience. To contribute check out https://github.com/reflex-dev/reflex/blob/main/CONTRIBUTING.md[CONTRIBUTING.md]

Reflex is open-source and licensed under the https://raw.githubusercontent.com/reflex-dev/reflex/main/LICENSE[Apache License 2.0].