This two-volume set, CCIS 2392 and CCIS 2393, constitutes the refereed proceedings of the 4th International Conference on Smart Technologies, Systems and Applications, SmartTech-IC 2024, held in Quito, Ecuador, during December 2-4, 2024. The 68 full papers presented in these proceedings were carefully reviewed and selected from 168 submissions. They were categorized under the following topical sections: Part I: Smart Technologies; Smart Systems. Part II: Smart Trends and Applications; Poster Session.