A free download is not always open source. Some free programs keep their code private, and some paid programs share theirs. Many people mix up these ideas because price and rights are easy to confuse.
Open source software is software with a license that lets people see, study, change, and share its source code. The license sets the rules, so users still have to follow its terms. Open source versus proprietary is a question about rights, while free versus paid is a question about price.
What Is Open Source Software?
Source code is the set of instructions that developers write to build a program. It controls what the software does and how it handles user actions and data. An image editor, for example, has code that tells it how to crop a photo or change its colors.
With open source software, anyone with the right skills can read that code and make changes the license allows. Just posting code online is not enough, though. The license has to give users those rights.
The Open Source Initiative publishes the Open Source Definition, which is the standard most people use. It requires access to the source code and permission to share modified versions. It also says a license cannot block people from using the software in any field, including business.
What You Can Do With Open Source Software
The exact rules depend on the license. In general, open source software lets you:
- Use the program for personal, school, or business tasks.
- Study the code to see how it works.
- Change the code or add new features.
- Share copies of the program.
- Share your modified versions, as long as you follow the license.
These rights do not erase copyright. The original authors still own their work, and you must keep any required notices.
How Open Source Projects Are Built
A project can start with one developer, a company, or a nonprofit group. The creator publishes the code and picks a license. Other people can then report bugs, suggest changes, or send in code.
Project maintainers review those contributions and decide what goes into the official version. Many projects use public code repositories to track changes and bug reports. Some depend on volunteers, while others have paid teams.
Is Public Code Always Open Source?
No. Code that you can read is not automatically open source. A developer might post a program online with no license at all. In that case, visitors can look at the code, but they do not have permission to copy, change, or share it.
Some projects use source-available licenses. These let people view the code but limit how it can be used. If a license does not meet the Open Source Definition, the software should not be called open source. Always read the license before you reuse any code.
What Is Proprietary Software?
Proprietary software is software that its owner controls through a restrictive license. The source code is usually private. Users get permission to run the program, but they generally cannot change it or share it.
Microsoft Windows and Adobe Photoshop are well-known examples. You can install and use these products, but their standard user licenses generally do not give you permission to modify the original source code or distribute altered versions. Many proprietary products come with official support and vendor-managed updates, although this depends on the product and plan.
Proprietary software can be free, paid once, or sold by subscription. The word describes the license, not the price.
Open Source vs. Proprietary Software: Key Differences
The main difference is who controls the source code. Open source licenses give users specific rights to inspect, change, and share it. Proprietary licenses usually keep those rights with the owner.
| Feature | Open Source Software | Proprietary Software |
|---|---|---|
| Source code | Available under its license | Usually private |
| Customization | Users can change the code | Usually limited to vendor options |
| Redistribution | Allowed under license terms | Usually restricted |
| Updates | Maintainers or contributors | The owner or vendor |
| Support | Community or paid providers | Vendor or authorized partners |
| Price | Free or paid | Free or paid |
Neither model is better in every case. A business with developers may like the flexibility of open source. A team that wants a ready-made product with one company to call may prefer proprietary software.
Customization shows the trade-off well. A company can hire a developer to adapt an open source content management system to its workflow. With proprietary software, you can usually change only what the vendor allows. But custom code still needs testing, documentation, and upkeep, so it is never truly free.
Is Open Source Software Always Free?
No. In this term, “open” refers to the rights a license gives you, not to the price. A company can sell open source software or charge for services around it, such as installation, cloud hosting, training, or technical support.
The word “free” has two meanings here:
- Free of charge: the software costs nothing to download or use.
- Free as in freedom: you can run, study, change, and share the software.
The Free Software Foundation uses the second meaning. That is why a free download is not always open source, and open source software is not always free of charge.
Free vs. Paid Software: What Is the Difference?
Free and paid describe what you pay. They say nothing about whether you can see or change the code. A program can be free and proprietary, and another can be paid and open source.
Freeware
Freeware is a loose term for software that users can usually download and use without paying. It has no single, universally accepted definition. The term is commonly used for programs that cost nothing but do not provide access to their source code or permission to modify it. Always check the software’s license to understand your rights.
Freemium Software
Freemium software gives you a basic version for free and charges for extras. Those extras might be more storage, more users, or advanced tools. Freemium is a pricing model, not a type of license, so a freemium product can be proprietary or can include open source parts.
Paid Software
Paid software requires a license fee or a subscription. With a one-time purchase, you pay once for a version, and upgrades or support may cost extra. With a subscription, you pay monthly or yearly to keep access.
Here is how the models compare:
| Model | Usually Free to Use? | Source Code Access | Can Users Modify It? |
|---|---|---|---|
| Open source | Often, but not always | Yes, under its license | Yes, under its license |
| Freeware | Usually | Often no | Usually no |
| Freemium | Basic version only | Depends on the product | Depends on the license |
| Paid software | No | Depends on the product | Depends on the license |
These categories can overlap. Open source software can be sold, and a proprietary product can offer a free plan.
Common Open Source Licenses
An open source license spells out what you can do with the code and what conditions you must meet. Most fall into two groups: permissive and copyleft.
Permissive Licenses
Permissive licenses allow broad reuse with few conditions. Developers often choose them when they want their code to work in many kinds of projects, including some proprietary ones. Common examples are:
- MIT License: allows broad use, modification, and sharing if you keep the copyright and license notices.
- Apache License 2.0: allows broad reuse and includes an express patent license.
- BSD licenses: allow reuse and sharing under the terms of the specific BSD license.
Copyleft Licenses
Copyleft licenses let you use and change the software but add rules meant to keep it open. Two well-known examples are:
- GNU General Public License (GPL): When you distribute software covered by the GPL, you must follow its conditions. These generally include providing the corresponding source code and keeping covered derivative works under the GPL.
- GNU Affero General Public License (AGPL): Adds a network-use rule. If you modify an AGPL-covered program and let users interact with that modified version remotely over a network, you must offer those users the corresponding source code.
The exact duties depend on the license and how you use or distribute the software. When in doubt, read the full text or ask a lawyer.
Can You Sell or Use Open Source Software for Business?
Yes. Open source software can generally be used commercially, modified, and sold if you follow the license. Many companies earn money from open source by selling services such as setup, custom development, support, hosting, training, and managed updates.
Selling an open source product does not turn it into proprietary software. The license still decides what rights customers get. If you plan to put open source code inside a commercial product, check the license of every component, because some licenses have rules that apply when software is distributed or offered over a network.
Commercial describes software offered as part of a business activity, while proprietary describes restrictions on users’ rights. A company can develop and sell open source software or earn money by providing support for it. Therefore, commercial software is not always proprietary software.
Examples of Open Source Software
Open source software covers everyday tasks as well as professional work.
| Software | Main Use |
|---|---|
| Ubuntu | Operating system for computers and servers |
| Mozilla Firefox | Web browser |
| LibreOffice | Office suite for documents, spreadsheets, and slides |
| GIMP | Photo editing and graphics |
| WordPress | Website and content management platform |
| VLC Media Player | Audio and video player |
| Blender | 3D modeling, animation, and visual effects |
Ubuntu is a Linux-based system that developers and organizations often use for desktops and servers. Firefox is developed in public, so people can study and contribute to its code. Chrome is different. It is built on the open source Chromium project, but Google Chrome adds components that Google controls.
LibreOffice suits students, home users, and businesses that want office tools without buying a traditional suite. WordPress supports themes, plugins, and custom features, but some themes, plugins, and hosting plans cost money and have their own license terms. Individual downloads of any of these programs may also include third-party parts with separate terms.
Advantages of Open Source Software
Open source software works best when users want control over the code or want to build on an existing project.
More Control
You can study and change the code within the license terms. This lets developers fix problems, add features, and adapt a program to a specific job.
More Choice of Support
Some projects have several companies or developers who offer support. That can give you more options than relying on one vendor. The benefit only holds if those providers have real experience with the project.
Chances to Learn
Students and developers can read real code, report bugs, and suggest fixes. This is a good way to learn how teams build and maintain software.
Lower License Costs
Many open source programs have no license fee, which helps students and small businesses get started. Setup, hosting, training, and support can still cost money.
Transparency
Qualified people can inspect the code to see how a program behaves. Access alone does not prove the software is secure or well maintained.
Disadvantages of Open Source Software
The freedom to change code comes with work. Someone has to have the time, skills, and budget to manage it.
Some Projects Need Technical Skills
Some programs are easy to install, and others take real expertise to set up or maintain. A business without an IT team may need to hire outside help.
Support Can Be Limited
Not every project has an official support team. Many rely on forums, guides, and volunteers. If you need fast answers or guaranteed response times, you may have to pay for professional support.
Projects Can Go Inactive
If maintainers leave or run out of resources, a project may stop getting updates. Users are then left with bugs and security gaps. Check recent releases and activity before you commit.
Compatibility Can Be a Problem
An open source program may not work with every device, business tool, or file format. Test your key integrations before you move any important work or data.
License Rules Need Attention
Open source still comes with legal conditions. Some licenses require you to keep notices or share source code when you distribute software. Review the licenses of the parts you use, especially if you build or sell software.
Is Open Source Software Safe and Secure?
Open source software can be very secure, but open code does not guarantee safety. Public code gives developers a chance to find and report weaknesses. Real security depends on testing, maintenance, updates, and how you install and manage the software.
Proprietary software can also have flaws, even though its code is private. The risks below apply to both models.
- Unpatched vulnerabilities: known problems that are not fixed in the version you run.
- Inactive projects: software that no longer gets regular security updates.
- Outdated dependencies: older libraries that may contain known weaknesses.
- Malicious packages: fake or compromised packages that carry harmful code.
- Supply chain attacks: attacks on package sources or development systems that spread to other products.
How to Check a Project Before You Use It
Look at the health of the project, not just its features.
| Check | What to Look For |
|---|---|
| Recent activity | Regular updates and releases |
| Maintainers | Named people or organizations in charge |
| Security process | A clear way to report and fix vulnerabilities |
| Documentation | Reliable setup and update instructions |
| License | Terms that fit your planned use |
| Backups | A way to protect and restore your data |
Teams that build software should also keep a software bill of materials (SBOM). An SBOM is a list of the components and dependencies inside a product. It helps teams see what they are using and spot parts that need security updates.
How to Choose Open Source or Proprietary Software
The right choice depends on the job, the people who will manage the software, and the support you expect. These questions can help.
What Do You Need the Software to Do?
Start with the tasks. A student may only need a simple office suite. A business may need a system that supports many users and connects to other tools. Compare products against your real needs instead of choosing by price alone.
Do You Need to Change the Code?
If you want custom features or control over how a program works, open source may fit. If the standard features already do the job, a proprietary product may be easier to manage.
Can You Get the Support You Need?
Check the documentation, support channels, and update options. Community help may be enough for personal use. A business that relies on the software every day may need a paid plan or an in-house team.
What Will It Cost Over Time?
The purchase price is only one part of the cost. Total cost of ownership also includes setup, migration, hosting, training, custom development, updates, security checks, and backups. An open source tool with no license fee may still need paid technical help. A proprietary product may cost more up front but include services you would otherwise buy separately.
Can You Move Your Data Later?
Check whether you can export your data in a useful format. Also look at how much you depend on plugins, hosting providers, and custom features. Open source can reduce some kinds of vendor lock-in, but it does not remove every technical or business tie.
When Each Option Fits
Open source software may be a good choice when you need source code access, want custom features, have developers or technical support, or want to learn from and contribute to a project.
Proprietary software may be a better fit when you want a ready-to-use product, prefer direct vendor support, lack the skills to manage custom software, or need a specific paid feature.
You can also use both. A business might run its website on WordPress and its accounting on a proprietary product. The goal is to pick the right tool for each task.
Frequently Asked Questions About Open Source Software
What Is Open Source Software in Simple Words?
It is software whose license lets you see, study, change, and share its source code. You can adapt the program, as long as you follow the license rules.
Is Open Source Software Free?
Not always. Many programs cost nothing to download, but companies can charge for the software or for hosting, support, and other services. “Open source” describes user rights, not price.
What Is the Difference Between Open Source and Proprietary Software?
Open source software gives users rights to access and change the code under a license. Proprietary software generally keeps the code private and limits what users can change or share.
Is Freeware the Same as Open Source Software?
No. Freeware usually means software that costs nothing, but its code is often private and closed to changes. Open source software gives users specific rights to study, modify, and share the code.
Can Businesses Use and Sell Open Source Software?
Yes. Open source software can generally be used commercially and sold, as long as you follow the license. Selling it does not remove the rights the license gives to others.
Is Open Source Software More Secure Than Proprietary Software?
Not automatically. Open code can be inspected, but security also depends on maintenance, testing, and timely updates. Both open source and proprietary software can be secure or insecure.
What Happens If Public Code Has No License?
Do not assume you can reuse it. Without a license that grants permission, copyright rules generally still apply. Check the project’s licensing information before you copy, change, or share the code.
Can Open Source Software Become Proprietary?
A company can build a separate proprietary product that uses open source parts when the licenses allow it. It cannot take back the rights it already gave to users of an existing open source version. The outcome depends on who owns the code and which licenses apply.
Choosing Software That Fits Your Needs
Open source software gives you the right to study, change, and share code under a license. Proprietary software usually keeps the code under the owner’s control. Price is a separate matter, because both types can be free or paid.
Before you pick a program, look past the price tag. Check the license, how well the project is maintained, its security record, the support available, and the total cost of ownership. The best choice is the one that meets your needs and that you can manage over time.
You Might Also Like:
What Is SaaS? Meaning, Examples, and How It Works
What Is Application and Software? Differences, Types, and Examples
I’m Emma Rose, the founder of Punstation. I cover technology, digital trends, business, and online tools, creating practical guides and thoughtful reviews to help readers understand their options and make informed decisions. For more on how I approach my content, see our Editorial Standards.