According to Baidu query experience: the apps that can query trademarks are:

1. Aiqicha: This software has a powerful and free corporate information query function, which can help users quickly To check trademarks, there are also functions such as Quan Master trademark inquiry, trademark registration inquiry, trademark progress inquiry, etc. These platforms collect massive amounts of trademark data information, making it convenient for users to inquire at any time.

2. Master Quan: This is a software that focuses on trademark inquiry. It can also conduct industrial and commercial inquiries, trademark registration, and also supports enterprise inquiries. You can check the usage status of trademarks at any time.

3. Shangbiao: Provides users with services such as trademark buying and selling, trademark supermarket, e-commerce entry, store transactions, etc., as well as functions such as online trademark notarization and patent application transfer.

4. Yunhulu: Provide users with one-stop services in the trademark industry, with built-in services such as trademark registration, application, inquiry, transfer, and design.