# LuLu

> free and open-source application firewall software for macOS

**Wikidata**: [Q125320111](https://www.wikidata.org/wiki/Q125320111)  
**Source**: https://4ort.xyz/entity/lulu-q125320111

## Summary
LuLu is a free and open-source application firewall for macOS developed by Objective-See. It allows users to monitor and control network connections made by individual applications, providing enhanced security and privacy.

## Key Facts
- Developed by Objective-See, a non-profit software organization founded in 2015.
- Runs on macOS, first released in 2001.
- Written in Objective-C, a high-level object-oriented programming language.
- Distributed under the GNU General Public License, version 3.0.
- Latest stable version is 2.3.0, released on February 8, 2021.
- Available as free software, allowing users to run, study, change, and distribute it.
- Source code is hosted on GitHub at [https://github.com/objective-see/LuLu](https://github.com/objective-see/LuLu).
- Official website: [https://objective-see.org/products/lulu.html](https://objective-see.org/products/lulu.html).

## FAQs
### Q: What is LuLu used for?
A: LuLu is used to monitor and control network connections made by applications on macOS, helping users manage and secure their network activity.

### Q: Is LuLu free to use?
A: Yes, LuLu is free and open-source software, allowing users to freely run, study, change, and distribute it.

### Q: Who developed LuLu?
A: LuLu was developed by Objective-See, a non-profit software organization based in the United States.

### Q: What programming language was LuLu written in?
A: LuLu was written in Objective-C, a high-level object-oriented programming language.

### Q: How do I install LuLu?
A: LuLu can be downloaded from the official website or GitHub repository, and installed like any other macOS application.

## Why It Matters
LuLu plays a crucial role in enhancing the security and privacy of macOS users by providing a transparent and user-friendly way to monitor and control network connections. As macOS has become a popular platform for both personal and professional use, tools like LuLu help users protect their data from unauthorized access and potential threats. By allowing users to see and manage which applications are connecting to the internet, LuLu empowers users to make informed decisions about their digital security. This is particularly important in an era where privacy concerns and cybersecurity threats are increasingly prevalent. LuLu’s open-source nature also ensures that the software is transparent and can be audited by the community, further enhancing trust in its functionality.

## Notable For
- One of the first open-source application firewalls for macOS.
- Provides real-time monitoring of network connections by individual applications.
- Offers a user-friendly interface for managing firewall rules.
- Actively maintained by Objective-See, ensuring regular updates and improvements.
- Supports multiple versions of macOS, making it widely compatible.

## Body
### Overview
LuLu is a free and open-source application firewall designed specifically for macOS. It was created by Objective-See, a non-profit organization known for developing security-related software tools. The software allows users to monitor and control network connections made by individual applications, providing a layer of security and privacy.

### Development and Release
LuLu was developed using Objective-C, a high-level programming language. The first stable version, 1.1.0, was released on September 25, 2018. Since then, several updates have been released, with the latest stable version being 2.3.0, released on February 8, 2021. The software is distributed under the GNU General Public License, version 3.0, ensuring that it remains free and open-source.

### Features and Functionality
LuLu provides users with the ability to see which applications are attempting to connect to the internet and to block or allow these connections. This functionality is particularly useful for users who want to enhance their privacy and security. The software offers a real-time view of network activity, allowing users to make informed decisions about their digital security.

### Compatibility and Availability
LuLu is compatible with macOS and has been designed to work across multiple versions of the operating system. The software is available for free download from the official website and GitHub repository. Users can install it like any other macOS application, making it accessible to a wide range of users.

### Community and Support
LuLu benefits from the support of Objective-See, which actively maintains and updates the software. This ensures that users have access to the latest features and security improvements. The open-source nature of LuLu also means that the community can contribute to its development, further enhancing its functionality and reliability.

```json
{
  "@context": "https://schema.org",
  "@type": "SoftwareApplication",
  "name": "LuLu",
  "description": "Free and open-source application firewall software for macOS",
  "url": "https://objective-see.org/products/lulu.html",
  "operatingSystem": "macOS",
  "applicationCategory": "SecurityApplication",
  "license": "GNU General Public License, version 3.0",
  "softwareVersion": "2.3.0",
  "datePublished": "2021-02-08",
  "developer": {
    "@type": "Organization",
    "name": "Objective-See",
    "url": "https://objective-see.org"
  },
  "codeRepository": "https://github.com/objective-see/LuLu",
  "programmingLanguage": "Objective-C"
}

## References

1. [Source](https://github.com/objective-see/LuLu/blob/master/LICENSE.md)
2. [2025](https://github.com/EvanLi/Github-Ranking/blob/master/Data/github-ranking-2025-07-06.csv)
3. [Release 1.1.0. 2018](https://github.com/objective-see/LuLu/releases/tag/1.1.0)
4. [Release 1.1.1. 2018](https://github.com/objective-see/LuLu/releases/tag/1.1.1)
5. [Release 1.1.2. 2018](https://github.com/objective-see/LuLu/releases/tag/1.1.2)
6. [Release 1.2.0. 2019](https://github.com/objective-see/LuLu/releases/tag/v1.2.0)
7. [Release 1.2.1. 2019](https://github.com/objective-see/LuLu/releases/tag/v1.2.1)
8. [Release 1.2.2. 2019](https://github.com/objective-see/LuLu/releases/tag/v1.2.2)
9. [Release 1.2.3. 2019](https://github.com/objective-see/LuLu/releases/tag/v1.2.3)
10. [Release 2.1.0. 2021](https://github.com/objective-see/LuLu/releases/tag/v2.1.0)
11. [Release 2.2.0. 2021](https://github.com/objective-see/LuLu/releases/tag/v2.2.0)
12. [Release 2.3.0. 2021](https://github.com/objective-see/LuLu/releases/tag/v2.3.0)
13. [Release 2.3.1. 2021](https://github.com/objective-see/LuLu/releases/tag/v2.3.1)
14. [Release 2.3.2. 2021](https://github.com/objective-see/LuLu/releases/tag/v2.3.2)
15. [Release 2.4.0. 2021](https://github.com/objective-see/LuLu/releases/tag/v2.4.0)
16. [Release 2.4.1. 2021](https://github.com/objective-see/LuLu/releases/tag/v2.4.1)
17. [Release 2.4.2. 2022](https://github.com/objective-see/LuLu/releases/tag/v2.4.2)
18. [Release 2.4.3. 2023](https://github.com/objective-see/LuLu/releases/tag/v2.4.3)
19. [Release 2.5.0. 2023](https://github.com/objective-see/LuLu/releases/tag/v2.5.0)
20. [Release 2.5.1. 2023](https://github.com/objective-see/LuLu/releases/tag/v2.5.1)
21. [Release 2.6.0. 2024](https://github.com/objective-see/LuLu/releases/tag/v2.6.0)
22. [Release 2.6.1. 2024](https://github.com/objective-see/LuLu/releases/tag/v2.6.1)
23. [Release 2.6.2. 2024](https://github.com/objective-see/LuLu/releases/tag/v2.6.2)
24. [Release 2.6.3. 2024](https://github.com/objective-see/LuLu/releases/tag/v2.6.3)
25. [Release 2.9.5. 2024](https://github.com/objective-see/LuLu/releases/tag/v2.9.5)
26. [Release 2.9.6. 2024](https://github.com/objective-see/LuLu/releases/tag/v2.9.6)
27. [Release 2.9.7. 2024](https://github.com/objective-see/LuLu/releases/tag/v2.9.7)
28. [Release 3.0.0. 2025](https://github.com/objective-see/LuLu/releases/tag/v3.0.0)
29. [Release 3.0.1. 2025](https://github.com/objective-see/LuLu/releases/tag/v3.0.1)
30. [Release 3.1.0. 2025](https://github.com/objective-see/LuLu/releases/tag/v3.1.0)
31. [Release 3.1.1. 2025](https://github.com/objective-see/LuLu/releases/tag/v3.1.1)
32. [Release 3.1.2. 2025](https://github.com/objective-see/LuLu/releases/tag/v3.1.2)
33. [Release 3.1.3. 2025](https://github.com/objective-see/LuLu/releases/tag/v3.1.3)
34. [Release 3.1.4. 2025](https://github.com/objective-see/LuLu/releases/tag/v3.1.4)
35. [Release 3.1.5. 2025](https://github.com/objective-see/LuLu/releases/tag/v3.1.5)
36. [Release 4.0.0. 2025](https://github.com/objective-see/LuLu/releases/tag/v4.0.0)
37. [Release 4.0.1. 2025](https://github.com/objective-see/LuLu/releases/tag/v4.0.1)
38. [Release 4.1.0. 2025](https://github.com/objective-see/LuLu/releases/tag/v4.1.0)
39. [Release 4.2.0. 2025](https://github.com/objective-see/LuLu/releases/tag/v4.2.0)
40. [Release 4.2.1. 2026](https://github.com/objective-see/LuLu/releases/tag/v4.2.1)
41. [Release 4.3.0. 2026](https://github.com/objective-see/LuLu/releases/tag/v4.3.0)
42. [Release 4.3.1. 2026](https://github.com/objective-see/LuLu/releases/tag/v4.3.1)
43. [Source](https://github.com/objective-see/LuLu)