Streamlit vs Fastapi: Which is Better?

Comparing Streamlit and FastAPI is an interesting exercise as they serve different purposes within the realm of web development. Streamlit is primarily focused on creating data-driven web applications with a strong emphasis on ease of use and rapid prototyping, while FastAPI is a modern web framework for building APIs with Python, known for its performance and scalability. Let’s delve deeper into each and compare them based on various factors.


Introduction: Streamlit is an open-source Python library used for creating interactive web applications for data science and machine learning projects. It simplifies the process of building web interfaces for data analysis and visualization, allowing developers to create applications quickly using Python scripts.

Key Features:

Ease of Use: Streamlit is known for its simplicity and minimal learning curve. With its intuitive API and reactive programming model, developers can create interactive applications with just a few lines of Python code.

Rapid Prototyping: Streamlit facilitates rapid prototyping by providing built-in widgets for creating interactive components such as sliders, buttons, and text inputs. This allows developers to iterate quickly and experiment with different ideas.

Integration with Data Science Libraries: Streamlit seamlessly integrates with popular data science libraries such as Pandas, Matplotlib, and TensorFlow, enabling developers to leverage these libraries for data manipulation, analysis, and visualization within their applications.

Real-time Collaboration: Streamlit supports real-time collaboration, allowing multiple users to work on the same application simultaneously. This can be particularly useful for teams working on collaborative data analysis projects.

Deployment: Streamlit provides built-in support for deploying applications to various platforms, including Streamlit Sharing, Heroku, and AWS. This makes it easy to share applications with others and deploy them to production environments.


Introduction: FastAPI is a modern web framework for building APIs with Python. It is built on top of Starlette for the web parts and Pydantic for the data validation and serialization, offering high performance and scalability while maintaining developer productivity.

Key Features:

Performance: FastAPI is known for its high performance, thanks to its asynchronous support and efficient request handling. It leverages Python’s async and await syntax to handle requests concurrently, resulting in low latency and high throughput.

Type Safety: FastAPI uses Pydantic models for request and response validation, ensuring type safety and reducing the risk of runtime errors. This makes it easier to write correct and maintainable code, especially in large codebases.

Automatic Documentation: FastAPI generates interactive API documentation automatically based on the code’s type annotations and docstrings. This documentation is interactive, allowing developers to test endpoints directly from the browser, making API development more straightforward and efficient.

Dependency Injection: FastAPI supports dependency injection, allowing developers to declare dependencies for their endpoints and have them automatically injected at runtime. This promotes modularity and code reuse, making it easier to manage complex applications.

WebSocket Support: FastAPI has built-in support for WebSocket connections, enabling real-time communication between clients and servers. This is useful for building applications that require bidirectional communication, such as chat apps or real-time dashboards.


Now, let’s compare Streamlit and FastAPI based on various factors:

Use Case:

Streamlit: Ideal for building data-driven web applications and interactive data visualizations, particularly in the context of data science and machine learning projects.

FastAPI: Designed for building high-performance APIs with Python, suitable for a wide range of use cases, including web services, microservices, and backend systems.

Ease of Use:

Streamlit: Known for its simplicity and minimal learning curve, making it easy for data scientists and developers to create interactive applications without extensive web development experience.

FastAPI: Requires some familiarity with asynchronous programming and Python’s type annotations but provides clear documentation and intuitive APIs for building APIs quickly and efficiently.

Development Speed:

Streamlit: Enables rapid prototyping and development with its intuitive API and built-in widgets, allowing developers to iterate quickly and experiment with ideas.

FastAPI: Provides tools for rapid API development, such as automatic documentation generation and request validation, allowing developers to build APIs quickly without sacrificing performance.


Streamlit: Designed for building lightweight web applications and may face scalability challenges for large-scale deployments with heavy traffic.

FastAPI: Known for its high performance and scalability, thanks to its asynchronous support and efficient request handling. It can handle thousands of requests per second with low latency, making it suitable for high-traffic applications.

Community and Ecosystem:

Streamlit: Has a growing community of users and contributors, with a focus on data science and machine learning applications.

FastAPI: Has a vibrant community and ecosystem, with many third-party libraries and extensions available for building APIs and integrating with other technologies.

Final Conclusion on Streamlit vs Fastapi: Which is Better?

In conclusion, Streamlit and FastAPI serve different purposes within the realm of web development, with Streamlit focusing on data-driven web applications and FastAPI specializing in building high-performance APIs.

The choice between Streamlit and FastAPI depends on the specific requirements, preferences, and expertise of the development team, as well as the nature and scope of the project.

For data science and machine learning projects requiring rapid prototyping and interactive data visualization, Streamlit may be the preferred choice, while FastAPI is more suitable for building scalable and high-performance APIs.

Ultimately, both Streamlit and FastAPI have their strengths and can be valuable tools in the toolkit of web developers and data scientists.


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