QuillBot vs Grammarly (Superhuman): Rewrite or Enforce Rules

The short answer: if four writers keep spelling the product name three different ways, Grammarly fits, and Grammarly is now part of Superhuman: Pro puts one shared style guide and one brand tone in front of the whole team for $144 per member a year, or $30 a month on monthly billing (Grammarly pricing article, checked on 26 October 2026). If one editor spends the week reshaping agency copy that is already approved, QuillBot fits: its grammar checks are mostly free, its free Paraphraser rewrites in two modes, and Premium adds eight more (QuillBot modes). Choose QuillBot if your job is rewording; choose Grammarly if your job is keeping several people on one set of rules.

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Both tools fix commas, the least interesting part of either. QuillBot is built around changing sentences you hand it. Grammarly is built around catching what a team keeps getting wrong.

What decides it:

1. The seat sum, both ways. For example, four writers on Grammarly Pro cost 4 x $144 = $576 a year on annual billing, or 4 x $30 x 12 = $1,440 if paid month by month (Grammarly pricing article). QuillBot publishes no figure to set beside it; its Premium price depends on region and billing period and appears at checkout (QuillBot price article).
2. The naming list you already keep. The brand book's list of product names, trademarks and banned words is the raw material for both: Grammarly turns it into style rules for everyone (style rules), and QuillBot's Freeze Words keeps those terms unchanged during a rewrite, a Premium feature with one frozen word allowed on a free login (Freeze Words).
3. The count that settles it. Take the last ten pieces your reviewer edited and sort every edit into two piles: wording and length on one side, names, tone and rule breaks on the other. A tall first pile points to QuillBot; a tall second pile points to Grammarly.

Side by side

From QuillBot's help articles on grammar, paraphrasing, teams and its API, and Grammarly's plans and agents pages, read on 26 October 2026.

Where the two part ways

Changing sentences, or flagging them

QuillBot's Paraphraser takes a paragraph and returns a different one, and the mode sets how far it goes: Fluency fixes grammar with the fewest changes, Shorten cuts length, Creative makes bold changes and can shift meaning, and Custom follows a word you type, such as "friendly" (modes). Grammarly works the other way round. It reads what the writer typed and flags the departures, and on Pro it can also rewrite full sentences and shift tone (plans page). One hands you a new version; the other marks what is wrong with yours.

What a team shares

Both sell team features, and they are closer than the brand names suggest. QuillBot's Team Plans give every member a full Premium seat plus a team style guide, a dictionary and usage reports, bought in bands of 2 to 10, 11 to 50 and 51 or more (Team Plans). Grammarly Pro allows up to 149 seats on one plan, with one style guide and one brand tone, and unlimited of each only on Enterprise (pricing article, plans page). A company with three brands hits Grammarly's single style guide before it hits anything else.

Knowing the price before the card comes out

Grammarly states its price in dollars and offers euro, pound and rupee prices at checkout. QuillBot states none: its help centre lists monthly, quarterly and annual plans and says prices adjust to your location at checkout, and the upgrade page answered automated reading with a security check on 26 October 2026 (QuillBot price article, upgrade page). One quote goes into a budget sheet today; the other needs someone to open checkout.

An agent step: Grammarly's Paraphraser adapts, the writer decides

Grammarly lists a Paraphraser among its AI agents, described as adapting writing for the intended audience, tone and style, and says most of its agents can be tried on the free plan, with some kept for paid customers (agents page). The job: a product page written for engineers has to become a version for finance buyers. Paste the approved paragraph, ask the agent to adapt it for a CFO, and read its proposal line by line. The writer accepts or rejects each change and checks every claim against the approved original before the new version goes anywhere.

QuillBot offers no API for an outside agent to call (API article); its AI stays inside its own modes.

Prices, checked on 26 October 2026

Grammarly, from the pricing article and plans page: Free at $0; Pro at $30 per member a month, $60 per member a quarter, or $144 per member a year; Enterprise through sales, now sold through Superhuman Go.

QuillBot: Premium is priced by region, with monthly, quarterly and annual terms, and a Team Plan discounts by seat count (price article, Team Plans). No figure could be read on 26 October 2026. A single month is allowed, and cancelling keeps Premium until the period ends (one-month article).

Run both free tiers on the same three paragraphs

Before anyone pays, give one writer a week with both free tiers. QuillBot's free Grammar Checker catches grammar, spelling and punctuation, and Grammarly Free corrects mistakes and shows tone (QuillBot Grammar Checker plans, Grammarly plans). Paste the same three paragraphs into each, note what each catches, then rewrite one paragraph in QuillBot's free Fluency mode. If neither free tier saves the reviewer an edit, neither paid tier will.

Grammarly's plans page leads with $12 a month for Pro, a figure that exists only as the average of $144 paid for the year at signing. A team that drops the tool in month three has already paid for the other nine, so start with monthly or quarterly seats and move to the year once the style rules are being accepted.

Choose by the job

Choose QuillBot if your job is reshaping copy that already exists: tightening agency drafts, cutting a paragraph to ad length, or smoothing text from colleagues writing in a second language.

Choose Grammarly if your job is one brand voice across many writers and many apps, with a published price per seat you can budget today.

More in the QuillBot entry, how to use QuillBot, the Grammarly entry and how to use Grammarly. For either tool against a chat assistant, see QuillBot vs ChatGPT and Grammarly vs ChatGPT.

FAQ

Is Grammarly still a separate product?

Yes, sold under its own name. Its support pages note that Grammarly is now part of Superhuman, a suite that also includes Superhuman Go, Coda and Superhuman Mail, and that Pro replaces the old Business plan (pricing article).

How long a passage does QuillBot's free Paraphraser take?

QuillBot's own articles disagree. The Paraphraser article says free users can paraphrase up to 100 words at a time, and the account comparison article says up to 125 (Paraphraser plans, account comparison). Plan on 100.

Can one QuillBot Premium account cover a team?

No. QuillBot says only one person may use a Premium account and that sharing it can get the account disabled; two or more people need a Team Plan (sharing article).