Concordancer tools have been used to help students learn aspects of written English by engaging them to access, examine, and analyze language examples in a corpus. Nonetheless, their efficacy remains uncertain when compared to other tools. This study compared a concordancer tool to Grammarly, QuillBot, Google search, online dictionaries, and students' own knowledge to carry out language exercises requiring the students to choose correct forms. It involved 59 EFL undergraduate students enrolled in English writing classes. The students were presented with a sentence completion exercise addressing four areas: subject-verb agreement, tenses, prepositions, and correct word usage. They were given the option of using a concordancer or other tools to address the sentence completion exercise. Data came from worksheets and an open-ended questionnaire. The results demonstrated that the concordancer had varying degrees of effectiveness in helping the students identify correct language forms and retain the language they learned across the four assessed areas. The questionnaire revealed that the students found the concordancer challenging and preferred other tools. The paper also offers recommendations for addressing the students' difficulties when using the concordancer tool.