Cost of living in Chomutov (Czech Republic) is 63% cheaper than in Zurich (Switzerland)
This comparison is lacking data. It provides a decent comparison, but it is not yet reliable. It is based on 753 prices entered by 128 different people.
For example, to keep the same standard of living that would require CHF 8,700 in Zurich you would need to make just about CHF 3,176 (71,800 Kč) in Chomutov.