Software Alternatives & Startups

PyInstaller VS FastAPI

Compare PyInstaller VS FastAPI and see what are their differences

PyInstaller

PyInstaller is a program that freezes (packages) Python programs into stand-alone executables...

Rating
0 reviews
FastAPI

FastAPI is an Open Source, modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.

Rating
5.0 · 1 review
Pricing
Open source Free
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, FastAPI should be more popular than PyInstaller. It has been mentioned 312 times since March 2021.

social mentions
33 vs 312
Website Builder popularity
100% vs 0%
alternatives listed
30 vs 240+

Base details

Website, pricing, platforms and company facts side by side.

PyInstaller
FastAPI
Website pyinstaller.org fastapi.tiangolo.com
Pricing
Open source Free
Company Startup from Colombia
Listed in

Features and specs

What each product offers, as listed by its team.

PyInstaller 5 features
FastAPI 7 features
  • Cross-Platform Support
    PyInstaller supports Windows, macOS, and Linux, allowing developers to create executables for multiple platforms from a single codebase.
  • Single Executable
    PyInstaller can bundle a Python application and all its dependencies into a single executable, simplifying distribution as users do not need to install Python separately.
  • Easy to Use
    PyInstaller has straightforward commands and a simple configuration process, making it accessible even for those with limited experience in creating executables.
  • Customizable
    PyInstaller provides various options for customization, allowing developers to specify which files to include or exclude, add data files, and more.
  • Active Community
    PyInstaller benefits from an active community that contributes to its development and provides support through forums and other platforms.

Possible disadvantages

  • Executable Size
    The executable files generated by PyInstaller can be large since they include the Python interpreter and all dependencies, which may not be ideal for applications with size constraints.
  • Compatibility Issues
    While PyInstaller supports many third-party Python packages, some packages may not work out of the box, requiring additional configuration or adjustments.
  • Occasional Bugs
    Like any software tool, PyInstaller can have bugs, especially with new or less common Python features, which may require troubleshooting or code workarounds.
  • Limited Optimization
    The executables produced by PyInstaller may not be as optimized in terms of performance as those created by more complex methods or tools specifically designed for performance enhancements.
  • Dynamic Module Loading
    Handling dynamic imports can be challenging with PyInstaller, requiring developers to manually specify hidden imports to ensure all dependencies are included.
  • High Performance
    Built on Starlette and Pydantic, FastAPI is one of the fastest frameworks for Python, providing high performance due to its asynchronous request handling.
  • Automatic Interactive API Documentation
    FastAPI automatically generates interactive API documentation via Swagger UI and ReDoc, which are very helpful for development and testing.
  • Type Checking and Validation
    With Pydantic models and Python type hints, FastAPI provides automatic data validation and type checking, reducing the chance of runtime errors.
  • Ease of Use
    Its syntax and design make it easy to learn for Python developers, offering a smooth development experience while reducing boilerplate code.
  • Asynchronous Support
    FastAPI supports asynchronous programming, allowing for better performance for I/O-bound operations, making it optimal for handling many simultaneous connections.
  • Extensive Documentation
    It has comprehensive and well-structured documentation, which is very useful for both beginners and advanced users.
  • Community and Ecosystem
    FastAPI has a growing community and ecosystem, with many plugins and integrations available to extend its functionality.

Possible disadvantages

  • Learning Curve for Asynchronous Programming
    Although FastAPI itself is easy to learn, grasping the concepts of asynchronous programming in Python can be challenging for beginners.
  • Complex Dependencies
    Using Pydantic for advanced validation can make the request models complex, requiring a deeper understanding of Pydantic and its functionalities.
  • Early Stage Libraries
    Some third-party libraries and extensions specifically tailored for FastAPI might still be in early stages of development and lack long-term stability.
  • Limited Real-World Examples
    Although the documentation is extensive, there might be limited real-world examples and case studies readily available compared to more mature frameworks.
  • Deployment Complexity
    Deploying FastAPI applications might be more complex in comparison to traditional synchronous frameworks, mainly due to the need for asynchronous server setups.

Analysis

An editorial look at what each product does well and who it suits.

PyInstaller
FastAPI

No analysis of PyInstaller yet.

Overall verdict

  • FastAPI is widely regarded as a good choice, especially for applications that require high performance, scalability, and modern Python features. It is suitable for both simple and complex projects, making it a versatile tool in the web development ecosystem.

Why this product is good

  • FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.7+ based on standard Python type hints. It is built on top of Starlette for web framework capabilities and Pydantic for data validation and settings management. FastAPI is known for its excellent performance, automatic generation of interactive API documentation (with Swagger and Redoc), and support for asynchronous programming. Developers appreciate its ease of use, detailed documentation, and helpful error messages.

Recommended for

  • Developers building RESTful APIs
  • Teams looking for a high-performance ASGI-based web framework
  • Projects that require asynchronous programming capabilities
  • Applications needing automatic generation of interactive API documentation
  • Python developers who prefer utilizing type hints for code clarity and validation

Videos

Walkthroughs and reviews on video.

PyInstaller 3 videos + Add
FastAPI 3 videos + Add

Archivo ejecutable en Python | Windows| PyInstaller |PyQT5| Python | ¡Muy fácil!

More videos

  • - python hack #8 reverse shell espionage cmd fichier py en exe pyinstaller part2
  • - python hack #8 reverse shell espionage cmd fichier py en exe pyinstaller part1

FastAPI from the ground up

More videos

  • - 30 Days of Python - Day 14 - Web App with Flask, FastAPI, ngrok, and Invictify - Python TUTORIAL
  • - [PT] Python - API com FastAPI - Chat | twitch.tv/codeshow

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
PyInstaller
FastAPI
100% 100%
0% 0%
0% 0%
100% 100%
100% 100%
0% 0%
0% 0%
100% 100%

User comments

Share your experience with using PyInstaller and FastAPI. For example, how are they different and which one is better?

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Reviews and articles

External articles and on-site reviews we used to compare the two products.

PyInstaller no reviews yet
FastAPI 5.0 · 1 review

We have no reviews of PyInstaller yet. Be the first one to post

  • Rated 5/5 by Kurslog team
    SaaSHub review
    · Apr 2026

    When our backend team needs to build services for data parsing, aggregators, or high-load APIs, FastAPI is our absolute go-to choice. It completely lives up to its name-development speed is outstanding. The...

  • The 20 Best Laravel Alternatives for Web Development
    tms-outsource.com · Jan 2024

    FastAPI, as the name hints, is a swift mover. Built on Starlette, it’s all about speed and performance with Python. Crafting API masterpieces at the speed of light, now that’s something.

  • 25 Python Frameworks to Master
    kinsta.com · Oct 2023

    Since its release in 2018, it has rapidly gained popularity due to its great performance and simplicity. In fact, according to PyPi Stats, FastAPI has over 9 million monthly downloads, surpassing even full-stack...

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

PyInstaller 33 mentions
FastAPI 312 mentions
  • Show HN: Halloy – the modern IRC client I hope will outlive me
    I don't say it is best, but there are solutions like pyinstaller [0] to produce a binary from python code. [0] https://pyinstaller.org/en/stable/. - Source: Hacker News / 11 months ago
  • ReproZip – reproducible experiments from command-line executions
    Https://news.ycombinator.com/item?id=43553198 : > auditwheel show > auditwheel repair: copies these external shared libraries into the wheel itself, and automatically modifies the appropriate RPATH entries such that these... - Source: Hacker News / about 1 year ago
  • Cosmopolitan v3.5.0
    Looking forward toward somebody hooking together Python in APE [0], something like pex [1]/shiv[2]/pyinstaller[3], and the pants build system [4] to have a toolchain which spits out single-file python executables with baked-in venv and... - Source: Hacker News / about 2 years ago

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  • I Built My First Machine Learning API — Here's Everything I Learned
    I used FastAPI, a Python framework built specifically for creating APIs quickly, with automatic validation and interactive documentation baked in. - Source: dev.to / about 1 month ago
  • Shipping Sovereign SDK: Cryptographic Forensic Receipts and the End of the AI "Prose Tax"
    The Sovereign SDK is a Python-native framework designed to minimize prose overhead while generating ironclad, cryptographic execution receipts for AI agents, complete with drop-in FastAPI/Starlette ASGI middleware. - Source: dev.to / 4 months ago
  • 5-Minute AI Jobs and Closed Tabs — Why We Built Replay-Then-Tail SSE
    We had a feature in production where a single user request could run for five-plus minutes — fetch documents, chunk them, hit an LLM per chunk, synthesize a final answer. We did the obvious thing first: a FastAPI handler that ran the... - Source: dev.to / 5 months ago

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Alternatives to PyInstaller and FastAPI

When comparing PyInstaller and FastAPI, you can also consider the following products.