Open Source vs Proprietary Software: What’s the Difference?

Open source software and proprietary software differ in one thing first: who can see and change the source code. Open source publishes its code under a license that lets anyone use, study, modify, and redistribute it; proprietary software keeps the code closed and licenses only the right to run the finished program. That single difference shapes cost, customization, support, security, and how long the software outlives its maker.

What Is Open Source vs Proprietary Software?

The difference is that open source software releases its source code publicly under an OSI-approved license, while proprietary software keeps its source code private and licenses only the compiled program. The defining line is code access, not price:

• Open source software publishes its human-readable source code under an OSI-approved license, granting the right to use, study, modify, and redistribute it.
• Proprietary software keeps its source code closed; a vendor licenses the right to run the program under an end-user license agreement (EULA).
• The core distinction is source-code access – open source exposes the code, proprietary ships only the executable. See the guide to what Linux is and the software applications guide.

Open Source vs Proprietary: Side-by-Side

Open source trades vendor hand-holding for freedom and transparency; proprietary trades openness for a single accountable vendor. Here is each model at a glance, with who it suits:

How Does Source-Code Access Differ?

Source-code access is the foundation every other difference builds on: open source makes the code public so anyone can read and modify it, while proprietary keeps it secret and distributes only the compiled binary.

• Open source access: the full source lives in public repositories, so developers can inspect, fix, and extend the program.
• Proprietary access: the source is withheld; only the compiled executable ships, running without revealing how it works.
• Verification: open code can be audited by anyone, while proprietary code is trusted on the vendor’s assurance (you can read the Linux kernel; the Windows source stays inside Microsoft).

What Are the License Differences?

The license defines what you may legally do with the software: open source uses GPL, MIT, or Apache to grant freedoms to modify and share, while proprietary uses a EULA that restricts use to the vendor’s terms.

• GPL (copyleft): modified versions must stay open source, keeping derivative works free; written by the Free Software Foundation.
• MIT and Apache (permissive): allow reuse even inside closed products with minimal conditions; Apache 2.0 adds explicit patent-rights provisions.
• EULA (proprietary): grants the right to run the program, often on a set number of devices, while forbidding modification and redistribution. The Linux licensing model (GPL) is what the closed Windows EULA does not share.

How Do Cost Models Compare?

Cost is a common but imprecise way to split the two: open source is usually free to obtain and run, while proprietary typically requires a purchase or subscription – but the license, not the price, defines open source.

• Open source cost: usually zero for the software itself; revenue comes from support, hosting, and services rather than license fees (skilled teams can cut software cost 30-60%).
• Proprietary cost: a one-time purchase or recurring subscription, such as Microsoft 365 or Adobe Creative Cloud, plus paid upgrades and add-ons.
• The license, not the price: Red Hat sells support for free-to-copy code, and some zero-cost programs are still proprietary – price never settles the question.

How Do Customization and Freedom Compare?

Access to the code decides how far the software can be adapted: open source allows unlimited customization because users can modify the source, while proprietary restricts changes to the options the vendor exposes.

• Open source customization: extends to the source code itself – change behavior, add features, build derivative versions, and run the changed version freely.
• Proprietary customization: limited to settings, plugins, and APIs the vendor provides, since the underlying code stays closed.
• Forking is unique to open source: a community can copy a project and develop it in a new direction (LibreOffice branched from OpenOffice). The 3D modeling software guide shows the deep customization open code permits.

How Do Support and Accountability Differ?

Support structure decides who fixes problems and who is responsible: proprietary provides vendor support and a single accountable company, while open source relies on community support with optional paid commercial support.

• Proprietary support: comes from the vendor through official channels, with a company accountable for fixes, updates, and service agreements.
• Open source community support: draws on forums, documentation, and contributors; help depends on the project’s community size.
• Commercial open source support: sold by companies such as Red Hat and Canonical, pairing open code with paid service guarantees that can match proprietary SLAs.

Which Model Is More Secure?

Security depends on the practices around the code more than the model: open source relies on many reviewers auditing public code, proprietary relies on internal review plus closed code, and neither is automatically safer.

• Open source security: many reviewers can find and fix flaws in public code (the many-eyes principle), though public code also exposes weaknesses to attackers.
• Proprietary security: rests on the vendor’s internal auditing and on keeping code closed (security through obscurity), with no external verification.
• Shared reality: both Linux and Windows have patched critical vulnerabilities, so security follows from maintenance and review, not the model.

What Are Examples of Open Source and Proprietary Software?

Named programs show the two models in software people use daily: open source includes Linux, LibreOffice, Blender, Firefox, and VLC, while proprietary includes Windows, Microsoft Office, and Adobe Photoshop.

• Linux vs Windows: the open-source operating system against Microsoft’s proprietary one – differing in code access, cost, and customization.
• LibreOffice vs Microsoft Office: the free, open-source office suite against the proprietary subscription suite.
• Blender / Firefox / VLC vs Adobe and closed apps: free, open-source creative, browser, and media tools alongside proprietary alternatives.

Blender, covered in the 3D modeling software guide, competes with proprietary creative software, while LibreOffice mirrors Microsoft Office without a license fee. The video editing software and CAD software guides include both open-source and proprietary options.

Open Source vs Proprietary Software Comparison Table

The table compares open source and proprietary software across the dimensions that decide which model fits a use – source-code access, licensing, cost, customization, support, and security:

Last Thoughts on Open Source vs Proprietary Software

Open source and proprietary software differ first in source-code access, which then shapes licensing, cost, customization, support, and security. Open source publishes code under licenses such as the GPL and MIT, usually costs nothing, and allows unlimited modification, while proprietary software keeps code closed, charges for use, and offers vendor accountability. Neither model is inherently more secure.

Examples such as Linux versus Windows show both serving the same purpose. Readers can continue with the guide to Linux, the explanation of 3D modeling software, or the software applications guide that links the full software cluster.

Key Takeaways:

• Open source publishes its source code under an OSI license while proprietary software keeps it closed, the core distinction.
• Licensing differs, with the GPL, MIT, and Apache granting freedoms versus a proprietary EULA that restricts use.
• Open source is usually free while proprietary needs purchase, though the license, not the price, defines open source.
• Open source allows unlimited customization through code access, while proprietary software limits changes to vendor options.
• Proprietary offers vendor accountability while open source offers community plus optional paid support.
• Neither model is automatically more secure, since security follows from maintenance and review rather than the model.

Frequently Asked Questions (FAQs)