Real-Time vs On-Demand Antivirus: What’s Better for Windows 10 Users?

Kenoxisav   |   17 Jun 2025

When it comes to protecting your Windows 10 system from viruses, malware, ransomware, and other cyber threats, choosing the right type of antivirus protection is essential. Two popular approaches dominate the landscape: real-time antivirus and on-demand antivirus. Each has its advantages and ideal use cases, but which one is better for you as a Windows 10 user?

This blog will explore both types of antivirus software in detail, comparing their strengths and weaknesses so you can make an informed decision that best aligns with your usage habits and security needs.

What Is Real-Time Antivirus?

Real-time antivirus protection runs continuously in the background, monitoring your system in real time. It checks files as they are opened, downloaded, or modified and immediately takes action if it detects a threat.

Key Features:

• Continuous system monitoring
• Automatic scanning of new files and software
• Instant alerts and quarantining of threats
• Protection during web browsing, file sharing, and installations

Popular real-time antivirus programs include Windows Defender (now Microsoft Defender), Bitdefender, Norton, Kaspersky, and Avast.

What Is On-Demand Antivirus?

On-demand antivirus software, on the other hand, does not run continuously. Instead, you initiate scans manually, either of specific files or the entire system. These tools are often used as second-line defenses or for periodic system audits.

Key Features:

• Manual scanning when the user initiates it
• Often used as a backup to real-time antivirus
• Focuses on deep scans rather than continuous monitoring
• Fewer system resources used when idle

Examples of on-demand antivirus tools include Malwarebytes Free (without real-time protection enabled), ESET Online Scanner, and Norton Power Eraser.

Real-Time Antivirus: Pros and Cons

Pros:

1. Immediate Threat Detection: Detects and blocks threats the moment they appear.
2. Web Protection: Actively monitors web traffic to prevent malicious downloads or phishing attacks.
3. Automated Scanning: No need to remember to scan—protection is always active.
4. User-Friendly: Typically requires little to no configuration for average users.
5. 
   

Cons:

1. System Resource Usage: Can consume significant CPU and RAM, especially during background scans.
2. False Positives: May occasionally flag legitimate programs as malicious.
3. Subscription Costs: Most premium real-time tools require paid subscriptions for full functionality.

On-Demand Antivirus: Pros and Cons

Pros:

1. Lightweight: Uses fewer resources when not actively scanning.
2. Ideal for Secondary Scans: Excellent for double-checking your system’s health.
3. Customizable Scans: Gives you control over what, when, and how to scan.
4. Free Options: Many on-demand scanners are free and don’t run continuously.

Cons:

1. No Active Protection: Threats can slip through between scans.
2. User Reliant: You must remember to run scans and keep the software updated.
3. Delayed Detection: Malware may operate undetected until a manual scan is performed.

Real-Time vs On-Demand: Which Should Windows 10 Users Choose?

The answer depends on how you use your computer and how much risk you're exposed to online.

Use Case 1: Everyday User (Browsing, Shopping, Streaming)

For the average Windows 10 user who spends time browsing the web, shopping online, and downloading files, real-time antivirus is highly recommended. It offers automatic protection and guards against evolving threats like phishing, ransomware, and malicious ads. Windows Defender, which is built into Windows 10, provides decent real-time protection for most users, especially when paired with safe browsing habits.

Use Case 2: Power User or Tech-Savvy Individual

If you're a power user, developer, or someone who frequently installs new software or visits lesser-known sites, using both real-time and on-demand antivirus can be beneficial. For example, you might rely on Microsoft Defender for real-time protection and run a weekly scan with Malwarebytes Free to catch anything that slipped through.

Use Case 3: Low-Risk or Offline Use

For systems that are used infrequently or not connected to the internet often—such as a home media server or legacy business computer—on-demand antivirus might be sufficient. Just ensure regular scans are scheduled and updates are applied when connected to the internet.

How Windows 10 Handles Antivirus by Default

Windows 10 comes with Microsoft Defender Antivirus enabled by default. It provides real-time protection and has significantly improved over the years, now ranking competitively with third-party solutions in independent tests. It’s lightweight, frequently updated, and integrated into the operating system, which makes it a good baseline option for real-time defense.

However, Windows Defender lacks some of the advanced threat protection features offered by premium antivirus tools like Bitdefender or Norton. For users who want extra layers—like VPNs, password managers, and identity theft protection—a third-party solution may be worth considering.

Conclusions

Choosing between real-time and on-demand antivirus doesn’t have to be an either/or decision. For most Windows 10 users, a combination of both provides the best coverage. Real-time antivirus ensures threats are caught immediately, while on-demand scanners serve as a powerful second opinion.

If you’re looking for a set-it-and-forget-it solution, go with a solid real-time antivirus. If you’re concerned about deeper malware or want to double-check your system’s integrity, add a trusted on-demand scanner to your toolkit.

Ultimately, your security depends not only on the tools you use but also on how you use them. Practice safe browsing, keep your software updated, and remain cautious with downloads and attachments. These habits, combined with the right antivirus setup, will keep your Windows 10 system safe and secure.