The UAE Government visa checker says GCC citizens do not need a visa. A Saudi citizen should therefore begin by checking the original travel document, its validity and whether the name matches the booking—not by applying for a visa.
A Saudi resident travelling on a non-Saudi passport is a separate case. Depending on the passport nationality, a traveller may enter visa-free, qualify for visa on arrival, or need advance approval. Saudi residence by itself is not a UAE visa exemption. If no other route applies, the GCC-resident eVisa may be available if its passport, residence-validity and profession conditions are met—and it must be obtained before arrival.
A foreign companion of a GCC citizen has a distinct ICP service and requirements. Check each traveller’s passport and status separately; do not assume a spouse, child or household worker inherits the citizen’s entry status.