Grammarly vs Quillbot: Which is better in 2026?

The task

Paste this FICTIONAL paragraph, which contains eight planted grammar and spelling mistakes, into each tool's grammar checker:

Fernhill Goods sells refills for kitchen cleaning sprays. Our refills arrives in paper pouches that you can recycle at home. Last month we recieved more then two hundred questions from customers who wanted to know how the refills works. Its simple: pour the concentrate into an empty bottle, add warm water and shake gently. If your not sure which scent to pick, our starter kit include all three. We beleive that small changes add up.

The eight mistakes: "refills arrives", "recieved", "more then", "the refills works", "Its simple", "your not sure", "kit include" and "beleive".

How we judged it

A planted mistake counts as fixed when the tool flags it and suggests the right correction (arrive, received, than, work, It's, you're, includes, believe). Ignore flags on the name Fernhill, style or clarity suggestions, and suggestions locked behind a paid plan.

Pass: all eight fixed, and no suggestion that would make correct text wrong.

Partial: six or seven fixed, or one suggestion that would introduce a mistake.

Fail: five or fewer fixed, or two or more suggestions that would introduce mistakes.

The task

Ask each tool to rewrite this FICTIONAL notice (83 words) so it is easier to read, keeping every fact:

Fernhill Goods hereby informs all subscribers that, with effect from March 1, the monthly refill subscription will be priced at $14 rather than the current $12. Subscribers who do not wish to continue under the revised terms may cancel without charge at any point prior to their next renewal date by means of the account page. Orders placed within the United States will continue to be dispatched free of charge, and the size of each refill pouch will remain unchanged at 500 ml.

In Grammarly, use this prompt with its generative AI: "Rewrite this in plain, simple English. Keep every fact." In Quillbot, use the Paraphraser in Standard mode.

How we judged it

The five facts: $14 instead of $12; from March 1; free cancellation before the next renewal, on the account page; free shipping in the United States; the 500 ml pouch.

Pass: all five facts unchanged, plainer wording (no "hereby", "with effect from" or "by means of"), and nothing added.

Partial: plainer, but one fact changed, softened or dropped; or every fact kept but the wording hardly simpler.

Fail: two or more facts changed or dropped, or a new claim or promise added.

The task

Copy the text of Abraham Lincoln's Second Inaugural Address (about 700 words) from the Avalon Project transcript, from "Fellow-Countrymen" to "all nations." Ask each tool for a one-paragraph summary of no more than 100 words.

In Grammarly, paste the text into a new document, select all of it and send this prompt to its generative AI:

Summarize this speech in one paragraph of no more than 100 words. Use only what the text says.

In Quillbot, use the Summarizer in Paragraph mode with the Summary Length slider at its shortest setting.

How we judged it

The four main points: war came although both sides dreaded it; slavery was its cause; both sides prayed to the same God; and the closing call, "with malice toward none", to bind up the nation's wounds and seek a lasting peace.

Pass: 100 words or fewer, all four points, and nothing wrong or invented.

Partial: one point missing, or 101 to 130 words.

Fail: two or more points missing, over 130 words, or a statement that is wrong or not in the text.