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.