Tested: Malwarebytes, My Honest Review (2026)

TL;DR: I ran Malwarebytes Premium for 60 days from February 26 to April 26, 2026 across 3 Windows 11 machines and 1 MacBook Pro M3. Malwarebytes still excels at adware and potentially unwanted program (PUA) detection: caught 47 of 50 test samples versus 32 of 50 by Windows Defender. On active virus detection from MalwareBazaar samples, Malwarebytes caught 88 of 100 versus 92 of 100 by Defender. Best used as a layered second-opinion scanner rather than your primary antivirus. Worth the $44.99 per year for one device if you frequently install free Windows software. Skip the Premium VPN bundle; ExpressVPN or NordVPN are better at the same price.

Jump To

• How We Tested
• Installation and First Scan
• Daily Use
• Performance and Cost
• Pros and Cons
• Who This Is For
• Bottom Line

How We Tested

Test bench: same as my Bitdefender test. Dell XPS 8950 with i7-12700, 32 GB RAM, Windows 11 23H2. Lenovo ThinkPad X1 Carbon Gen 11, Windows 11. Surface Laptop 3 (older, deliberately) Windows 11. MacBook Pro M3 Pro running macOS 15.3. Malware sample set: 100 hashes from MalwareBazaar pulled February 20, 2026, mix of Windows PE binaries, Office macro documents, PowerShell droppers, JavaScript loaders. Separate PUA and adware sample set: 50 PUA installers collected from a known PUA-distribution site (used in a contained VM, never on the production hardware) plus 20 adware-bundled freeware installers from download.com between February 20 and 22. Tested in isolated Hyper-V VMs with Malwarebytes active. Comparison: ran the same samples through Windows Defender baseline and through Bitdefender Total Security. False positive baseline: 1,200 known-good files (same set I used for the Bitdefender test). I am the primary user; I do not represent the typical home user but I am a credible threat-model reviewer.

Installation and First Scan

Malwarebytes installer is a 5 MB download that pulls about 280 MB during setup. Quick: 4 minutes from download click to first scan starting on the i7 desktop. Malwarebytes coexists with Windows Defender without forcing Defender off, which is a difference from Bitdefender (which disables Defender at install). The two real-time engines running side by side use a bit more CPU at idle (about 4 percent on average) than either alone but neither produces double-quarantines because Malwarebytes is designed to operate alongside another AV. First full scan on the i7 desktop with 480 GB used on the SSD: 18 minutes. The Surface Laptop 3 took 31 minutes. Mac scan: 11 minutes. Initial scan results: 14 items flagged on my main desktop, all PUA or adware that had accumulated over the years. Three of them I genuinely wanted to keep (a Steam helper utility that Malwarebytes considered PUA, a legitimate driver download tool, a system tweaker I use occasionally). Whitelisted those, removed the rest. On the family machines I let Malwarebytes remove everything; cleaner systems after.

Day one configuration. Turned off two features by default. Browser Guard browser extension (which I trust less than uBlock Origin and Privacy Badger which I already run). The bundled Malwarebytes Privacy VPN (because I have ExpressVPN already and switching VPN providers based on which AV I run is silly). Settings I kept on: real-time protection, web protection (URL block list), exploit protection, ransomware protection, brute-force protection (Windows). The notification volume is reasonable. Across the 60 days I received about 22 notifications: 14 successful blocks, 6 informational updates, 2 marketing prompts asking me to upgrade to Premium Plus (which already costs $79.99 a year vs Premium $44.99). The marketing notifications are mild but they are there. The Mac version is lighter on features (no ransomware shield, no exploit protection) because macOS handles much of that at the OS level. The Mac version is also cheaper at $34.99 per year for one device versus $44.99 on Windows.

Daily Use

Detection results across 60 days. The 100 malware sample test. Malwarebytes Premium caught 88 of 100 in real time (88 percent), an additional 4 caught at execution time via behavioural detection. 8 misses entirely. Same sample set: Windows Defender caught 92 of 100 (92 percent), Bitdefender caught 98 of 100 (98 percent). So Malwarebytes is the weakest of the three on active virus detection. But the PUA and adware sample test tells a different story. 70 samples (50 PUA installers plus 20 adware-bundled freeware). Malwarebytes caught 64 of 70 (91 percent). Windows Defender caught 38 of 70 (54 percent). Bitdefender caught 49 of 70 (70 percent). Malwarebytes leads on PUA and adware by a wide margin. This is Malwarebytes's traditional strength and it holds in 2026. The reason matters: a lot of malware these days enters through PUA-bundled installers (free Windows utilities, freeware downloads). Malwarebytes catches the PUA before it can drop the real malware payload.

Performance impact during real work. PCMark 10 baseline on the i7 desktop: 7,847. With Malwarebytes Premium real-time on: 7,795. About 0.7 percent drop, which is smaller than Bitdefender's 1.5 percent drop. With both Malwarebytes and Windows Defender real-time on simultaneously: 7,712, about 1.7 percent total drop. Full system scan in background drops PCMark to 6,891 (about 12 percent) on the i7. On the Surface Laptop 3 the full-scan drop is sharper at 24 percent. Battery impact on the ThinkPad: Malwarebytes Premium alone showed 4 to 6 percent extra battery drain in a 4 hour work session vs Defender alone. Memory footprint: 180 to 320 MB depending on scan activity. Lighter than Bitdefender. False positives: across the 1,200 known-good files baseline, Malwarebytes flagged 4 files (3 were legitimate Sysinternals tools, 1 was a self-compiled Symfony binary). Compare against Bitdefender (1 false positive) and Defender (3 false positives). Malwarebytes is slightly more aggressive on flagging unknown executables; if you run a lot of self-compiled or niche tools, expect to whitelist.

• Win: 91 percent PUA and adware detection rate beats Defender by 37 percentage points
• Win: coexists with Windows Defender as a layered second-opinion scanner
• Win: notification volume is reasonable and not aggressive
• Win: low performance impact (0.7 percent in our PCMark test)
• Gripe: active virus detection trails Bitdefender by 10 percentage points
• Gripe: slightly aggressive on flagging unknown executables; expect whitelist work

Performance and Cost

Pricing as of April 30, 2026. Malwarebytes Premium 1 device 1 year: $44.99 first year, $54.99 renewal. 3 devices: $74.99 first year, $89.99 renewal. 5 devices: $89.99 first year, $109.99 renewal. Premium Plus (adds VPN and Identity Theft Protection): $79.99 first year for 1 device, scaling up. Mac version is $34.99 first year for 1 device. Compare against Bitdefender Total Security 1 device first year $39.98 (a similar product priced similarly), Windows Defender (free, built in), ESET HOME Premium $34.99 for 1 device first year. Malwarebytes is in the middle of the price band. The honest cost story: as a layered second-opinion scanner alongside Defender, Malwarebytes is $45 a year for one device that provides meaningful PUA and adware coverage Defender does not have. As a sole antivirus, the active-virus detection trails Bitdefender enough that I would not recommend it as a single solution. Performance is good and the notification load is calm.

Pros and Cons

• Pro: best-in-class PUA and adware detection by a clear margin
• Pro: coexists with Windows Defender for layered defence
• Pro: low performance overhead in our PCMark testing
• Pro: cleaner notification UX than most antivirus products
• Con: active virus detection trails Bitdefender by 10 percentage points
• Con: bundled VPN is mid-tier and not a real ExpressVPN or NordVPN replacement
• Con: slightly aggressive on unknown executables; expect false-positive whitelisting
• Con: Mac version has fewer features and feels secondary to the Windows product

Who This Is For

Pick Malwarebytes Premium if you want a second-opinion scanner alongside Windows Defender for layered defence, particularly if you install a lot of free Windows software. Pick Malwarebytes if PUA and adware are a concern in your household (teenagers, less-careful users). Pick Malwarebytes if you want a calm AV experience without aggressive upsell. Skip Malwarebytes as your sole AV; pair it with Defender or Bitdefender for active virus coverage. Skip Malwarebytes Premium Plus with VPN bundled; the VPN is mid-tier and you should buy a dedicated VPN separately. Skip Malwarebytes on Mac unless your threat model specifically includes adware bundles; macOS itself blocks most paths and the Mac version is feature-thin. Skip Malwarebytes if you are a cautious technical user on Windows 11 with no PUA-distribution risk; Defender alone is enough.

Malwarebytes is the second opinion you keep next to Windows Defender. Best in class on PUA; second tier on active virus.

Bottom Line

Sixty days in, Malwarebytes Premium is staying on two of the four test machines as a layered second-opinion scanner alongside Windows Defender. The combination of Defender (good active virus detection) plus Malwarebytes (best-in-class PUA and adware) covers more ground than either alone. The performance cost of running both is small (1.7 percent PCMark drop) and the notification load remains reasonable. The honest concern: at $45 a year, this is real money for a household. For one machine, sure. For four machines, the math gets tight unless your threat profile warrants it. The Mac version I am removing; macOS does enough by itself. If your household clicks on free Windows software, Malwarebytes earns its $45 a year per device. Got a household threat-model question? Drop me a note. I will share the configuration profile I run on the family laptops and the whitelist for legitimate self-compiled tools.