QuillBot vs Sassbook AI Writer (2026): which should you pick?
As of Nov 13, 2026, QuillBot grades higher than Sassbook AI Writer: 2.8 against 1.8 out of 4.0.
Checked Oct 5, 2026 and Nov 13, 2026 · graded Oct 10, 2026 and Nov 13, 2026 by ToolGPA
QuillBot grades higher on value for money, features, ease of use and platforms. They get the same grade on the free plan.
Price, platforms and features side by side. The table says where each price was read and when.
QuillBot
AI paraphraser with grammar, summarizing and AI-detection tools
Sassbook AI Writer
AI writer, story writer, summarizer and paraphraser suite
Which one is for you
Pick QuillBot if
- Fits if you often need to reword or shorten something that's already written
- Works for people who want paraphrasing, grammar and citations under one login
Look elsewhere if
- Tight if you're staying free, since it rewords at most 125 words at a time in 2 modes and summarizes up to 1,200
- Pricey if you pay month by month, which the iOS app lists at $19.99
- Skip it if you need lots of plagiarism checking, as that's Premium only and stops at 25,000 words a month
- Watch out: the site says free limits may vary across platforms, and Premium summaries stop at 6,000 words
- Watch out: the Team plan is billed every 12 months and starts at 2 seats
Pick Sassbook AI Writer if
- Fits if you want writer, summariser and paraphraser in one account
- Works for light daily use inside the free caps
Look elsewhere if
- Pricey if you pay: $32.50 a user a month against a category middle of $9.75
- Skip it if you want one tool only, because they can't be subscribed to separately
- Tight if you stay free: 20 generations of up to 50 words a day
- Watch out: there are no refunds, and writer output tops out at 100 words even on Premium
How we grade them
| 2.8GPAQuillBotGood | 1.8GPASassbook AI WriterWeak | |
|---|---|---|
| Value for money | CPremium is $8.33 a month billed annually, which is exactly the middle for writing tools, and one account covers every tool on up to 10 devices. Monthly billing is another story: the iOS app lists it at $19.99. | D$32.50 per user a month billed yearly ($39 monthly), in the category's dearest tenth, which starts at $25. |
| Free plan and trial | CFree for good, but in small bites, and the caps are ones you'll hit: paraphrasing 125 words at a time in 2 modes, basic grammar fixes, summaries of up to 1,200 words, and limited goes on the Humanizer, AI Detector and AI chat. | CA free plan with daily caps, such as 20 writer generations of up to 50 words, and no card. |
| Features | BIt covers the whole job of a rewriting and checking kit: a paraphraser with 9 modes plus custom ones of your own in 23 languages, a grammar checker, a summarizer, a translator for more than 40 languages, an AI detector, a humanizer, plagiarism checks and a citation generator. | CFive tools: writer, story writer, summariser, paraphraser, headlines, with API credits. Writer output is short even on Premium. |
| Ease of use | BNo store rating on record, so we go on the listing: paste text, pick a mode, read the new version, with nothing to set up, and the extensions and keyboards put it where you already type. The free plan lets you try that before paying. | CNo store rating on record. Five tools and their limits to learn. |
| Platforms and integrations | AWeb, Mac and Windows apps, iPhone and Android apps and keyboards, plus Chrome, Edge and Safari extensions and a Word add-in. Every device type covered and places to plug into, which is rare in this category. Premium runs on up to 10 devices at a time. | CWeb only, with API credits on paid plans. |
| Best for | rewording text you've already written | a bundle of short AI writing tools |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: QuillBot and Sassbook AI Writer. How we grade
Price against what you get
QuillBot starts at $8.33 a month and scores 3.3 out of 4 on features, ease of use and platforms. Sassbook AI Writer starts at $32.50 a month for each person and scores 2.0.
QuillBot scores higher and starts $24.17 a month lower. Of the other writing tools on the chart, none scores higher than QuillBot for less, and 68 score higher than Sassbook AI Writer for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- QuillBot also covers chat assistant, citations and grammar & style.
- Sassbook AI Writer also covers long-form writing.
At a glance
| QuillBot | Sassbook AI Writer | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | $8.33 per month, billed annually (Premium) | $32.50 per user / month, billed yearly ($39 billed monthly) |
| Free plan | Paraphrase up to 125 words in 2 modes, basic grammar fixes, summaries of up to 1,200 words, and limited use of the Humanizer, AI Detector and AI chat. Limits may vary across platforms. | Free plan with daily limits: 20 writer generations of up to 50 words, 15 summaries of 2.5 pages, 10 paraphrases of 0.3 pages and 10 headline generations a day. No credit card required. |
| Free trial | None listed | None listed |
| Web | ||
| macOS | ||
| Windows | ||
| iOS | ||
| Android | ||
| Browser extension | ||
| Made by | Learneo, Inc. | Sassbook |
| Price read from | web.archive.org (not the vendor's own page) | sassbook.com |
| Checked | Oct 5, 2026 | Nov 13, 2026 |
Worth knowing
QuillBot
- The free plan paraphrases at most 125 words at a time and offers only the Standard and Fluency modes.
- Free summaries are capped at 1,200 words; Premium raises the cap to 6,000.
- Plagiarism checking is a Premium feature and is limited to 25,000 words a month.
- The pricing page leads with annual billing at $8.33 a month; the iOS app lists monthly billing at $19.99.
Sassbook AI Writer
- The tools cannot be subscribed to separately; the subscription covers all five.
- Pricing is per user, and extra users are added at checkout or from the account page.
- No refunds are issued; cancelling keeps access to the end of the billing cycle.
- Writer output per generation is short even on Premium (100 words).
Key features
QuillBot
- Paraphraser
- Rewords text in built-in modes: Standard and Fluency on the free plan, 9 modes plus unlimited custom modes on Premium. It paraphrases in 23 languages.
- Grammar Checker
- Fixes basic grammar errors on the free plan and adds advanced writing suggestions and tone insights on Premium. Grammar correction covers 6 languages.
- AI Detector and Humanizer
- The AI Detector flags AI-generated content, and the Humanizer rewrites text so it reads more naturally. Free use of both is limited; Premium gives full access.
- Summarizer and Translator
- Summarizes up to 1,200 words on the free plan and 6,000 on Premium, which adds custom summaries. The Translator covers more than 40 languages.
- Plagiarism and citation tools
- Premium scans up to 25,000 words a month for accidental plagiarism, and the Citation Generator formats references in APA, MLA and Chicago styles.
- Extensions and apps
- Chrome, Edge and Safari extensions, a Word add-in, macOS and Windows apps, and iOS and Android keyboards and apps. Premium runs on up to 10 devices at a time.
Sassbook AI Writer
- AI Writer
- Generates text from a prompt, with candidate outputs and controls for generation behavior on paid plans.
- AI Story Writer
- Writes fiction in genres such as classic, humor, sci-fi, romance and thriller; it shares the writer's limits.
- Summarizer and paraphraser
- Summarizes or rewrites documents measured in pages, from 2.5 pages on the free plan to 20 on Premium.
- Headline generator
- Produces headline candidates, from 2 per run on Free to 10 on Premium.
- Developer API credits
- Paid plans include monthly API credit; API-only plans are sold on a separate Developer API page.
Plans
QuillBot
Free$0
Paraphrase up to 125 words in 2 modes, fix basic grammar errors, summarize up to 1,200 words, and use the Humanizer and AI Detector with limits.
Premium$8.33
per month, billed annually
Full paraphrasing in 9 modes plus custom modes, advanced grammar suggestions, 6,000-word summaries, the full AI Detector and plagiarism checks on 25,000 words a month.
Team Plan$7.50
per seat / month, billed every 12 months ($89.95), for 2-10 seats
All Premium features plus writer-management dashboards and centralized billing. $6.66 a seat for 11-50 seats and $5.83 for 51 or more.
Sassbook AI Writer
Free$0
All five tools with daily caps: 20 writer generations (50 words, 2 candidates), 15 summaries, 10 paraphrases, 10 headline generations.
Standard$32.50
per user / month, billed yearly ($39 billed monthly)
No daily limits. Writer up to 70 words and 4 candidates, summaries and paraphrases up to 10 pages, plus $15 a month of API credits. Billed $390 a year.
Premium$49.16
per user / month, billed yearly ($59 billed monthly)
No daily limits. Writer up to 100 words and 6 candidates, summaries and paraphrases up to 20 pages, plus $25 a month of API credits. Billed $590 a year.
Ways to pay less
QuillBot
- Annual discount
Annual billing marked as 58% off
The pricing page labels annual billing 58% off the monthly rate, which brings Premium to $8.33 a month. In the iOS app the plans are $99.99 a year or $19.99 a month.
- Other savings
Team seats cost 10% to 30% less
Team plans are $7.50 a seat per month for 2-10 seats, $6.66 for 11-50 and $5.83 for 51 or more, billed every 12 months and labeled as 10%, 20% and 30% savings.
Sassbook AI Writer
- Annual discount
Two free months with annual billing
The pricing page offers two free months on annual subscriptions, for example $390 a year for Standard against $39 a month.
Common questions
Which is cheaper, QuillBot or Sassbook AI Writer?
As of Nov 13, 2026, QuillBot starts at $8.33 per month, billed annually (Premium), and Sassbook AI Writer starts at $32.50 per user / month, billed yearly ($39 billed monthly). One is priced for each person and the other is not, so which costs less depends on how many of you use it.
Which has a free plan, QuillBot or Sassbook AI Writer?
As of Nov 13, 2026, both QuillBot and Sassbook AI Writer have a free plan.
Which platforms do QuillBot and Sassbook AI Writer run on?
As of Nov 13, 2026, only QuillBot lists macOS, Windows, iOS and Android apps and a browser extension. Both list a web app. A platform missing from a listing is one its maker's pages did not mention.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.