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Is the duplicate checking of pen-net papers accurate? Will it be your own if you check the copy with pen and paper?
No, it's still formal. At present, the mainstream duplicate checking systems are: HowNet, Wanfang, Paperyy, Pen and Paperpass.

Basically, the standard is HowNet, and several other systems have their own advantages and disadvantages:

Wanfang: Never used it. It is said that the resources are not complete, and the test results are quite different from HowNet.

Paperpass: After several years of operation, it has a certain brand awareness and the effect is OK. Much stricter than HowNet and much higher.

Paperyy: The price is cheap, the speed is fast, and the database is powerful, which is not bad.

Pen: At present, I personally think that the duplicate checking system closest to HowNet has cooperated with many schools and is worth recommending. Our school library can be used.