Windows is the most installed operating system, but the answer depends on what you count
Microsoft Windows runs on roughly 70 to 75 percent of all desktop and laptop computers worldwide. That makes it the single most installed piece of software by a wide margin. However, the ranking shifts dramatically if you count mobile phones — Android, which is also made by Google, runs on about 70 percent of all smartphones globally. If you measure by sheer number of devices, Android wins because there are more phones than computers. If you measure by computers alone, Windows dominates.
The confusion exists because "most installed" can mean different things. You might count only personal computers, only servers, only phones, or all devices together. You might count by number of installations or by number of users. A single person might use Windows at work, Android on their phone, and macOS on a personal laptop — so they contribute to three different software totals. This guide focuses on the software that runs the most individual machines, starting with operating systems and then moving to applications that run on top of them.
Key Takeaways
- Windows is installed on roughly 70 to 75 percent of all desktop and laptop computers, making it the most installed operating system for traditional computers.
- Android, Google's mobile operating system, runs on more total devices than Windows because smartphones outnumber computers globally.
- Google Chrome is the most installed web browser, present on computers and phones, with over 60 percent of browser market share.
- The ranking of "most installed" changes depending on whether you count computers only, phones only, or all devices together.
- Server software like Linux runs on the majority of web servers, even though it is less visible to individual users than Windows or Android.
Why Windows dominates personal computers
Windows holds its position because it has been the standard business and home operating system since the 1990s. Most office workers use Windows machines. Schools and universities have Windows labs. Manufacturers like Dell, HP, and Lenovo ship Windows pre-installed on the vast majority of laptops and desktops they sell. Once an operating system becomes standard in an organization, switching costs are high — retraining staff, replacing software, and moving files all take time and money.
The installed base also feeds itself. Software developers write programs for Windows first because that is where the users are. Games, professional tools, and business applications all target Windows. A person buying a computer for work or gaming is likely to choose Windows because the software they need runs on it. This cycle has kept Windows at the top for decades, even as competitors like macOS and Linux have grown in specific markets.
Android's advantage in total device count
Android is installed on more individual devices than any other operating system because smartphones are now more common than computers. A typical household might have two or three phones but only one or two computers. Globally, there are roughly 6.5 billion smartphone users and about 2 billion computer users. Even though Android's market share on phones is similar to Windows's share on computers — around 70 percent — the sheer number of phones means Android reaches more people.
Android's reach extends beyond phones to tablets, smartwatches, and other devices. Google does not charge manufacturers a licensing fee for Android, which has made it attractive to phone makers in every price range. A person buying a budget phone in India, a mid-range device in Brazil, or a flagship phone in the United States is statistically most likely to get Android. This global accessibility has made Android the most installed operating system by raw device count.
Google Chrome as the dominant web browser
Google Chrome is the most installed web browser in the world, running on over 60 percent of all computers and phones. It comes pre-installed on Android phones and is the default browser on many Windows machines. Chrome is fast, syncs across devices, and integrates tightly with Google services like Gmail and Google Drive. Users who switch computers often choose Chrome because their bookmarks and passwords follow them automatically.
Chrome's dominance is recent. Internet Explorer held the top position for years, but it was slow and prone to security problems. Firefox offered an alternative for users who wanted more control, but it never captured more than 10 to 15 percent of the market. Safari, Apple's browser, is the default on iPhones and Macs but does not reach beyond Apple's ecosystem. Chrome's combination of speed, convenience, and cross-platform availability has made it the clear leader.
Linux on servers, even though you do not see it
If you count web servers — the computers that host websites and run cloud services — Linux is installed on the majority of them. Estimates vary, but Linux runs on 60 to 70 percent of all web servers worldwide. Most of the internet you use every day runs on Linux: Google's search results, Facebook's servers, Amazon's cloud platform, and Netflix's streaming infrastructure all rely heavily on Linux.
Linux is less visible than Windows or Android because most people never interact with it directly. You do not buy a Linux computer at a store the way you buy a Windows laptop. Instead, web hosting companies and technology firms install Linux on servers because it is free, reliable, and can run on inexpensive hardware. A single Linux server can handle thousands of users at once. For organizations running large-scale operations, Linux's cost and flexibility make it the obvious choice, even if individual users have never heard of it.
How the ranking changes by category
The "most installed" title depends entirely on what you are measuring. Here is how the top software changes by category:
| Category | Most Installed Software | Market Share |
|---|---|---|
| Desktop and laptop computers | Windows | 70–75% |
| Smartphones | Android | 70% |
| All devices combined | Android | ~45% |
| Web browsers | Google Chrome | 60%+ |
| Web servers | Linux | 60–70% |
| Office productivity software | Microsoft Office | ~50% |
Microsoft Office is worth noting separately because it is the most installed productivity suite. Word, Excel, and Outlook are standard in most workplaces. Google Workspace and LibreOffice offer alternatives, but Microsoft's decades of dominance in business mean that Office remains the default choice for organizations. Many people use Office at work and never switch to anything else.
Why these rankings matter
Understanding which software is most installed helps explain how the technology world actually works. Windows's dominance on computers is why most software is written for Windows first. Android's reach on phones is why app developers target Android and iOS before anything else. Chrome's browser dominance is why web developers optimize for Chrome's rendering engine. Linux's invisible presence on servers is why the internet runs as smoothly as it does.
These rankings also shift over time. Ten years ago, Internet Explorer was still a major player. Five years ago, Windows Phone was competing with Android and iOS. Market share changes when a new product is better, cheaper, or more convenient than what came before. Windows has held its position on computers because no competitor has offered a compelling enough reason for millions of organizations to switch. Android has grown because smartphones became essential and Android was available at every price point. Chrome became dominant because it was faster and more convenient than the alternatives.
Frequently Asked Questions
Is Windows or Android more installed?
Android is installed on more total devices because there are more smartphones than computers. However, Windows is installed on more computers specifically. If you count only personal computers, Windows wins. If you count all devices including phones, Android wins.
What is the second most installed operating system?
On computers, macOS is second after Windows, with roughly 15 to 20 percent market share. On phones, iOS is second after Android, with roughly 25 to 30 percent market share. The answer depends on whether you are asking about computers or phones.
Why is Linux not more popular on personal computers?
Linux is free and powerful, but it requires more technical knowledge to set up and use than Windows or macOS. Most people buy computers with an operating system already installed, and manufacturers pre-install Windows or macOS, not Linux. Linux is extremely popular on servers and among developers, but it has never captured the consumer market.
Is Google Chrome installed on every computer?
No, but it is the most popular browser by far. Internet Explorer and Edge come pre-installed on Windows machines, Safari comes on Macs, and Firefox remains popular among users who want more privacy. However, Chrome's 60 percent market share means it is installed on more computers than any other browser.
Could a different operating system become more installed than Windows?
It is possible but unlikely in the near term. Windows would have to become significantly worse, or a competitor would have to become dramatically better and cheaper. The installed base of Windows software and user familiarity make switching difficult. However, if a new technology like quantum computing or a major shift in how people work emerges, the rankings could change.