Grammar and clarity, for essays, not tweets.

Grammar is the floor, not the ceiling.

Most grammar checkers stop at typos and subject-verb agreement. For an essay, that's not enough. An essay can be grammatically perfect and still fail, weak thesis, disorganized paragraphs, unsupported claims, passive voice drowning the argument. Our checker is tuned to flag the higher-order writing problems that separate a B from an A.

Three categories make the biggest grade difference. Thesis specificity, an essay with a vague thesis ("Shakespeare's plays are interesting") tells a reader nothing about what argument the essay will make. We flag thesis statements that don't specify a position, a stake, and a scope, and we suggest concrete alternatives. Paragraph cohesion, a topic sentence should preview what the paragraph will argue, and the closing sentence should set up the next. We trace the logical flow paragraph-to-paragraph and flag breaks. Evidence-claim ratio, every interpretive claim should have a textual citation, an example, or a piece of evidence within two sentences. Claims that float free of evidence are where graders write "support?" in the margins.

How the academic-writing checker is built.

The checker runs three layers in sequence. The first layer is a fast deterministic pass for orthographic and grammatical errors, typos, capitalization, subject-verb agreement, pronoun-antecedent agreement, tense consistency. This is the layer most other tools stop at. The second layer is a stylometric pass that measures sentence-length variance, passive-voice rate, hedge-word density, and transition-marker frequency. When any of those metrics fall outside the academic-writing distribution, we flag the cluster, not just an individual sentence. The third layer is a semantic-coherence pass that uses sentence embeddings to check whether each paragraph actually develops a single idea, or whether it drifts. Drift is the silent grade-killer in long essays.

Our approach to suggestions: every flag includes a "why" link to the underlying rule, and every rewrite is offered as a suggestion the writer can accept, modify, or reject. Forcing rewrites is how essays lose voice. The goal is teach-and-improve, not auto-fix. Students who use the checker for a full term make measurably fewer of the same mistakes by mid-semester, that's the metric we optimize for, not surface-correction count.

Citation-format checking covers MLA 9, APA 7, Chicago 17, Harvard, and Vancouver, the five most common in U.S., UK, Canadian, and Australian higher ed. We validate in-text citations, footnote/endnote formatting, hanging-indent reference lists, capitalization rules within titles (sentence case vs. title case differs by style), and the dozens of edge cases that consume hours of student time. The full citation-rule reference is on our style-guide quick reference.