Efficient ways of enhancing students’ writing skills have long been researched. With digital tools that provide Artificial Intelligence, recent technological advancements have provided solutions to academic writing challenges. Artificial intelligence (AI) is a machine that could mimic and trace human intelligence by combining multiple functions. For academic writing and essay writing in particular, one of the most renowned AI-based tools called QuillBot was launched, allowing students to edit, check, summarize, and organize their writing within one single application. This study was a quasi-experimental study with a nonequivalent group design and a purposive random sampling method. The participants were 98 EFL university sophomores divided into two groups: the experimental group and the control group. Data was gathered through essay writing tests and an in-depth interview, and results were discovered through the use of frequencies and T-test analysis. The findings indicate that the AI-assisted QuillBot application can help students improve their essay-writing skills. The most striking findings are (1) they have seen significant improvements in their English essay writing post-test results
(2) in terms of attitudes, students believe QuillBot can improve their essay writing skills, particularly Grammar, Vocabulary, and Cohesion and Coherence, they enjoy their experience with the application, and they are eager to not only continue using QuillBot but also introduce the tool to others.