Start with a controlled sample
We used a 30-word English paragraph with deliberate errors: “I goes”, “buyed two book”, and incorrect agreement. Using a fixed sample makes the workflow easier to compare; it does not establish which product is best for every writer.
The correction is only part of the job
Grammarly surfaced seven suggestions: six for grammar and one for clarity. We accepted two corrections and confirmed them after reloading and in a downloaded Word document. QuillBot surfaced seven grammar corrections; accepting them produced the expected corrected paragraph in its editor.
Check how your text leaves the product
The Grammarly test verified a plain-text Word export. QuillBot displayed a copy-success message, but the automation clipboard check returned older text. We therefore left copying unverified instead of treating a toast as proof.
Choose around your actual workflow
Try your own terminology, paragraph structure, and export format. Our Spanish sample also received three expected corrections in QuillBot, while other-language Grammarly checks and long-document behavior remain untested.