Isn't Shandong health code interface free?

It's free.

Shandong province health code interface is free, you can rest assured to use it.

Shandong Health and Health Commission issued a document saying that Shandong Health Code has prepared a golden skin blessing, which can be owned for free after inoculation. The health code of the vaccinated person has a new layer of "skin", that is, a golden border, and small icons of injection and shield are added in the upper left corner, indicating that the holder has been protected by COVID-19 vaccine.