Most households now have more devices to protect than they did a few years ago: a Windows laptop, maybe a Mac, two or three phones and a tablet the kids share. Every one of them can be hit by a scam link, a dodgy download or a fake login page, and one careless tap is often all it takes.
Buying antivirus software sounds simple, but the options are confusing. Plans are sold by the number of devices, by the year, with or without a VPN, and some renew automatically. This guide explains what internet security software actually does, how to work out which plan suits your household or small office, and where a paid suite makes sense. We use the Trend Micro Maximum Security 3-device plan as our worked example.
By the end you will know how many licences to buy, which extras are worth paying for, and what to check before you hand over your card details.
What is internet security software and why it matters
Internet security software (often still called antivirus) is a set of tools that watch for harmful files, websites and messages on your devices. Modern suites go well beyond the old "scan for viruses" model. A typical suite combines several layers:
- Malware and ransomware protection: blocks or removes viruses, spyware and programs that lock your files and demand payment.
- Web protection: warns you about dangerous or fraudulent websites before the page loads.
- Identity and phishing protection: helps spot fake emails, texts and login pages designed to steal passwords or card details.
- Parental controls: lets you filter content and manage what children can see online.
- Mobile security: extends similar protection to Android and iOS phones and tablets.
Windows includes built-in protection, and for many careful users it is a reasonable baseline. A paid suite adds extra layers, such as stronger web filtering, parental controls and protection across Mac and mobile devices under one subscription. Whether that is worth it depends on how you use your devices, which the checklist below will help you decide.
Key specs explained
Security products do not have specs the way a monitor does, but there are a handful of details on the box that decide whether a plan fits you. Here is what they mean for our worked example, Trend Micro Maximum Security (3 Devices) 1 Year:
| Spec | Detail | Why it matters |
|---|---|---|
| Devices covered | 3 devices | One licence covers a mix of PC, Mac, Android and iOS devices up to the limit, so count every device you want protected. |
| Term | 1 year | The subscription runs for twelve months. After that, protection depends on renewing. |
| Platforms | PC, Mac, Android phones and tablets, iOS | Lets one plan cover a mixed household, rather than buying separate products. |
| Included apps | Maximum Security and Mobile Security | These are the two apps you install: one for computers, one for phones and tablets. |
| Threats covered | Viruses, malware, ransomware, dangerous websites, identity theft on social networks | Covers the everyday risks most households actually face. |
| Parental controls | Included for PC and Mac | Useful if children use the family computer. |
| Auto renew | Yes (listed on the product) | The plan is set to renew, so you should understand the renewal terms at activation. |
| Activation | Credit or debit card activation required | Have a card ready when you register. Read the screen carefully so you know what you are agreeing to. |
| Format | Retail mini box | A compact retail pack, not a bulky box. |
How to choose
Use this step-by-step method before you pick a plan.
1. Count your devices honestly
List every computer, phone and tablet you want protected. Include the kids' tablet and the old laptop in the spare room. A plan sized for three devices suits a couple with two phones and a laptop, or a small family sharing one computer. If you land on four or five, look at a larger plan or add-on licences rather than leaving a device unprotected.
2. Match the platforms
Check that the plan covers each operating system you use. Windows, Mac, Android and iOS are all common in one household, and a mixed plan saves buying separate products.
3. Decide whether you need a VPN
A VPN encrypts your traffic on public Wi-Fi, such as in cafes, airports or hotels. If you rarely leave home networks, you may not need one. If you often work from public hotspots, a plan that bundles a VPN can make sense.
4. Consider parental controls
If children use the family computer, built-in parental controls are a practical extra. If you only have adults in the house, you may be paying for a feature you will never use.
5. Check renewal and activation terms
Auto-renewing plans are convenient, but you should know when and how the renewal happens. Read the activation screen, note the renewal date and set a calendar reminder.
Common mistakes to avoid
- Running two antivirus programs at once. They can conflict and slow your device. Install one suite and let it manage Windows protection.
- Buying fewer licences than devices. Phones and tablets get scam links too.
- Assuming software replaces good habits. No product stops you from typing your password into a fake page.
- Ignoring updates. Keep the operating system and your apps up to date alongside the security suite.
- Forgetting the renewal date. Protection that lapses is the same as having none.
Our pick: Trend Micro Maximum Security (3 Devices) 1 Year
For a typical household or home office, our pick is the Trend Micro Maximum Security (3 Devices) 1 Year Retail Mini Box, currently $49.99.
What it does well
- Protects against viruses, malware and ransomware on PC and Mac.
- Guards against identity theft, including on social networks.
- Includes strong parental controls for the family computer.
- Blocks dangerous and fraudulent websites on Android and iOS phones and tablets, and guards against phishing scams.
- One plan covers three devices across different platforms, so it suits mixed households.
Limits and who should not buy it
- It does not include a VPN. If you regularly use public Wi-Fi and want one bundled in, look at the step-up plan in the table below.
- It covers three devices. Larger households will need more licences.
- It is a one-year plan with auto renew, and activation needs a credit or debit card. If you do not want a renewing subscription, think carefully before you register.
- If you already pay for protection through your workplace or another subscription, you may not need a second one.
You can view it and check availability on the product page.
Alternatives in our range
If the main pick is not quite right, here is how it compares with other options in our software and protection range.
| Product | Key differences | Price | Best for |
|---|---|---|---|
| Trend Micro Maximum Security (3 Devices) 1 Year | PC, Mac and mobile protection, parental controls, three devices | $49.99 | Households that want solid everyday protection |
| Trend Micro Maximum Security Plus (3 Devices) 1 Year | Adds a Secure VPN and Cleaner Pro utilities to the same protection, three devices | $79.99 | People who use public Wi-Fi or want PC and Mac clean-up tools |
| Trend Micro Maximum Security (1 Device) 1 Year Add-on | Single device, same Maximum Security protection, auto renew | $29.99 | Covering one extra computer or phone |
| Lenovo Absolute Home and Office Standard 1 Year | Laptop location, lock, data deletion and recovery tools rather than virus scanning | $38.99 | Protecting a laptop against loss or theft |
Note that the Lenovo Absolute product solves a different problem. It is about locating, locking and recovering a missing laptop, so it complements an antivirus suite rather than replacing it.
Setup and usage tips
- Remove old security software first. Uninstall any trial or expired antivirus before installing the new suite to avoid conflicts.
- Install on every device you want covered. The computer app and the mobile app are separate installs, so do your phones and tablets too.
- Run a full scan after installing. A first full scan gives you a clean baseline. Schedule regular scans for quiet times.
- Switch on parental controls early. If children use the computer, set up their profile and content rules at the start.
- Keep everything updated. Turn on automatic updates for the suite, the operating system and your browser.
- Back up your important files. Security software reduces the risk of ransomware, but a separate backup is your safety net. Our portable SSD backup guide explains how.
- Note your renewal date. Put a reminder in your calendar so protection does not lapse unexpectedly.
- Use strong, unique passwords. A password manager and two-step login add protection no antivirus can provide.
Who is it for
- Families with a shared computer and a mix of phones and tablets.
- Couples or housemates with a mix of Windows, Mac, Android and iOS devices.
- Home-office workers who want an extra layer on top of built-in protection.
- Parents who want parental controls on the family PC or Mac.
- Anyone who has had a close call with a scam email or fake website and wants better web protection.
If you are also setting up a new Windows computer, our Windows 11 Home or Pro guide covers the operating system side.
FAQ
Do I still need antivirus if Windows has built-in protection?
Windows includes basic protection that suits many careful users. A paid suite adds extras such as parental controls, stronger web filtering and cover for Mac and mobile devices under one plan. If you only use one Windows PC and take care online, the built-in tools may be enough. If you have a mixed household, a suite is easier to manage.
Can I use one licence on a mix of PC, Mac and phones?
The Maximum Security plan is described as providing security for PC, Mac and mobile devices, and the 3-device plan covers up to three devices. Install the computer app and the Mobile Security app on the devices you choose.
Does Maximum Security include a VPN?
No. The included apps are Maximum Security and Mobile Security. The Maximum Security Plus plan adds a Secure VPN and Cleaner Pro.
What happens when the year ends?
The plan is listed as auto renew, and activation requires a credit or debit card. Read the terms shown during activation so you know how and when renewal happens, and set a reminder.
Will it stop ransomware?
The suite is designed to protect against ransomware, along with viruses and malware. No security product is a guarantee, so keep a separate backup of important files and keep your system updated.
Is this suitable for a small office?
It can suit a very small office or home office with up to three devices. For larger teams you will need more licences, and it is worth asking us for help working out the right setup.
Can I protect a fourth device?
Yes, but you would need another licence. The one-device add-on plan is a straightforward way to cover a single extra computer or phone.
Ready to protect your devices?
Take a look at the Trend Micro Maximum Security (3 Devices) 1 Year, browse the full software and warranty range, or read more in our software and warranty buying guides. If you are unsure how many licences you need, contact us and we will help you choose. We sell and ship within Australia from Australian warehouses.