IObit’s free plan is very limited. It only offers a basic malware scanner and real-time protection for 1 Windows device. The malware scanner is limited to a database of just 9 million threats, and the real-time protection is very poor — it only caught about 40% the sample threats I used during testing.
You can upgrade to the paid version to get Bitdefender’s superior malware engine, along with web protection and ransomware protection, but these premium features still consistently scored lower than top antiviruses like Norton during testing. However, you can always try out IObit premium risk-free, as it comes with a 60-day money-back guarantee.