OpEx are investments a company pays for up-front, while CapEx are the on-going costs to run a business.

OpEx includes software licenses with contracts that have user rights in perpetuity, while CapEx includes software services that are easily reconfigured.

OpEx is expenses for the day-to-day operation of a business, while CapEx is investments in assets.

OpEx has depreciation, while there is no deprecation with CapEx.