Zurich and Geneva are ranked as the first and second most expensive expat cities in Europe and the 4th and 5th most expensive cities in the world for expatriates as at July 2017. This is due primarily to the strong Swiss Franc as well as due to high rentals and institutionalized high wages.

Xpatulator.com provides international cost of living and hardship data so that you can create reports online (24X7) using any of the calculators such as the cost of living index, cost of living allowance and expat salary calculators.
https://www.xpatulator.com/cost-of-living-article/Europe-Expat-Cost-of-Living-Comparison_708.cfm