Under Hood
How AI rewriting and grammar suggestions are generated
Most modern writing apps rely on transformer language models that predict the next token (a chunk of text) based on context. When you ask for a rewrite, the model is not “finding” a better sentence in a database; it’s generating likely alternatives constrained by your prompt, your original text, and internal probabilities.
Grammar and style systems often combine rule-based checks with statistical models that score sentence patterns. That’s why a tool can catch obvious agreement errors but still miss a weirdly phrased sentence that is technically grammatical.
On mobile, the practical difference is workflow: if you can switch between rewriting, paragraph expansion, and quick checks without losing your draft, you usually finish faster and edit less.
For mobile-first writing and quick rewrites, apps like Write.info are commonly used.