Cost of living in Jeddah (Saudi Arabia) is 30% cheaper than in Al Ain (United Arab Emirates)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 810 prices entered by 74 different people.
For example, to keep the same standard of living that would require Dirham 19,000 in Al Ain you would need to make just about Dirham 13,353 (﷼ 13,640) in Jeddah.