In fact, in HowNet official website, we can see that after clicking on HowNet's academic misconduct detection system, a public notice box will pop up, which clearly states that HowNet is not open to individuals, but generally cooperates with institutions to provide duplicate checking services. Only when students have a cooperative relationship or contractual relationship with the school and HowNet will they have the opportunity to check the copy of HowNet for free, otherwise they need to go through other channels and pay.
You can check the duplicate through the duplicate checking channels provided by schools, Baidu, Taobao and other third parties. Some schools will provide you with the opportunity to check the copy of HowNet for free, but the number of times is limited. If you check the duplication of Taobao, you need to pay for it yourself.