In this paper, we describe the concept and design of a novel visualization tool to aid in academic writing of English as a Second Language students. The tool makes use of theory in classroom discourse, WordNet API, and linguistics rules given by a linguistics expert, by analyzing English language essays for their linguistic bond counts and links within and between paragraphs. These linguistic indicators reveal the structure and flow of essays, clusters of main ideas, as well as incoherent sentences, which obstruct essay unity. The lack of essay unity is one of the most common writing errors of English as a Second Language learners. The output of the system is shown as several kinds of visualizations that provide writing feedback to users, as well as an autocorrect functionality to improve essay unity. Novice English learners may benefit greatly from this system.