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QuillBot vs Grammarly vs Smodin: In-Depth Comparison

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We keep going with our comparison series and take a closer look at three popular writing tools. This time, it's QuillBot, Grammarly, and Smodin. All three help with text in different ways, but their focus, limits, and approach to AI checks are very different. Let's break it down simply and honestly.

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Editor's pick

Quick Verdict: Smodin wins

These tools position themselves as full toolkits for complete text work, but the biggest differences are pricing, plan limits, and consistency of professional results.

Why we chose Smodin

  • Smodin offers the full suite of text tools starting from the Starter plan, with all tools connected in a single workflow. All tools connect easily with each other and support you at every step, from creating a title and structure to running different checks.
  • QuillBot offers tools for writing, checking, and editing text, plus some basic image features. However, strict free-tier limits and inconsistent results on longer texts can frustrate serious users.
  • Grammarly does not fall behind and, besides the grammar check we are already used to, which is still available with a subscription, it has started offering many more tools. On the downside, the tool flags almost everything, and this is annoying.
At a glance

Side-by-Side Comparison Table

To keep things simple, we put the main features we tested into one table.

Feature / Tool
QuillBotParaphrasing & Rewriting Hub
GrammarlyGrammar & Style Specialist
SmodinAll-in-One Writing Suite
General Comparison
Main focus
Editing and proofreading
Grammar and style
Full text work
Writing from scratch
Limited
No
Yes
Paraphrasing tools
Yes
Yes
Yes
Features & Accuracy
AI detection
Yes
Yes
Yes
Plagiarism checker
Yes
Yes
Yes
Readability check
No
Yes
Yes
Humanization tools
Yes
Yes
Yes
Our methodology

How We Compared These Tools

Methodology overview

We compared these tools based on how people actually use them, not just what they promise on the homepage. We tested real texts, checked how easy each tool feels, looked at AI and plagiarism checks, and paid attention to limits in free plans.

The goal was simple: see which tools help in real writing tasks and which ones feel restrictive.

Deep dives

Feature-by-Feature Comparison

Now we look closer at how each tool behaves in real tasks. This will show what each one is good at and where it is less convenient.

01

AI Detection Accuracy

Winner: Smodin
Detailed Insight
  • Smodin’s AI Content Detector distinguishes AI-generated from human text with strong accuracy. The Premium plan uses advanced detection models and provides detailed reports.
  • QuillBot has AI detection in its free and paid plans and promises high accuracy. But most importantly, the results can be inconsistent, especially with longer texts.
  • Grammarly has AI detection in the pro plan, and also allows a few free attempts even without signing up. But the tool is not very helpful if AI checking is your main goal.
02

Plagiarism Detection

Winner: Smodin
Detailed Insight
  • Smodin is a practical option for plagiarism checks. The program scans your text against billions of web and academic sources in seconds. You can see real results and exclude specific URLs.
  • QuillBot can check for plagiarism in its paid version. It promises 25,000 monthly words, support for all popular languages, and gives a full report with potential duplication.
  • Grammarly has plagiarism detection in the paid plan. The scan report also includes plagiarism check, punctuation, spelling, and readability.
03

AI Humanization

Winner: Smodin
Detailed Insight
  • Smodin rewrites AI text so it sounds more natural. You can choose between a formal or a generic writing style and upload your text in txt, .doc, .docx, or .pdf formats.
  • QuillBot helps text sound less robotic by rephrasing AI-written phrases. It isn’t good at academic texts, but pretty good for everyday communications like emails, social posts, and blogs.
  • Grammarly also offers a free Humanizer, but you can use it once or twice without signing up. The result sounds good, but too academic and doesn’t look AI-free if you scan with other checkers.
04

Writing & Editing Support

Winner: Smodin
Detailed Insight
  • Smodin covers writing, editing, rewriting, and checking, so it feels like an all-in-one workspace.
  • QuillBot has a big section of different checkers and works best for rewriting, shortening, or rephrasing sentences.
  • Grammarly is great for grammar, clarity, and tone, and it also has an AI assistant and various writing checkers.
05

User Interface & Ease of Use

Detailed Insight
  • Smodin has all the main tools like AI content detector, AI humanizer, and all the checkers on one screen. Each tool has a detailed instruction on how to use it and what to expect.
  • QuillBot is easy to start with and simple to use. It has many features on the left and right sides of the document and somewhat complex settings.
  • Grammarly has a clean, polished interface that works well in apps and browsers.
06

Reporting & Exports

Winner: Smodin
Detailed Insight
  • Smodin gives clear reports for AI and plagiarism checks and lets you download them.
  • QuillBot focuses on rewriting, so reports and exports are pretty basic.
  • Grammarly saves your work and feedback in your account, but detailed reports depend on the plan.
07

Language Coverage

Winner: Smodin
Detailed Insight
  • Smodin supports over 100 languages, and this makes it great for international users.
  • QuillBot mainly works in English, German, and French, but also promises support for about 20 languages for writing and 100+ languages for plagiarism detection.
  • Grammarly focuses mainly on English, with only basic support for more than 20 other languages.
Real-world perspective

Tool Overviews

Before going deeper, here's a quick and simple look at what each tool is and what it's mainly used for.

Tool overview

What Is QuillBot?

QuillBot was created as an accessible hub for rewriting and paraphrasing in 2017. It is popular among students and writers who want to change wording quickly. Today, the company offers many free tools and has expanded its services with audio, image, and search tools.

Tool overview

What Is Grammarly?

Grammarly was originally best known as a grammar checker. Over time, the company started positioning itself as a platform for full-text work. It now includes grammar and translations, various plagiarism and AI checks, as well as an all-knowing AI chat, although it still does not offer tools for creating text from scratch.

Tool overview

What Is Smodin?

Smodin is an all-in-one writing platform covering text generation, rewriting, plagiarism and AI detection. The integrated AI Chat handles broader research and academic questions, making it useful for students, teachers, writers, and agencies who need multiple tools in a single workflow.

Real Testing Results

We reviewed how each tool performs across common writing scenarios such as short texts, long-form content, and academic-style writing.

Real testing notes
  • Smodin performed well across most use cases. It usually caught AI text and copied content, and the readability suggestions actually made sense.
  • QuillBot: is fine for checking AI, but it can miss some stuff in longer texts or give inconsistent results in academic writing.
  • Grammarly: catches grammar and style mistakes really well, but its AI checking only works if you pay for the premium plan. Even then, it's not perfect at spotting AI-written text.
Final verdict

Final Verdict

Smodin is the most all-in-one tool here. You can write, rewrite, check for plagiarism and AI content, and even see readability feedback. QuillBot is best if you want to reword or rephrase text, but its AI and plagiarism checks are not always accurate. Grammarly leads for grammar checking, but also promises an AI Assistant. Nevertheless, the price per month is pretty high compared to other tools. In the end, it all depends on what matters most to you – full control and checks, fast rewriting, or clean, polished text.

Best overall pick: Smodin

Plans at a glance

Pricing Comparison

Quick look at prices and what you get:

Pricing breakdown by tool

  • Grammarly

    Free version checks grammar and style. Premium costs around $12 per month in a yearly plan and gives AI detection, plagiarism checks, tone suggestions, and an AI Assistant.

  • QuillBot

    The free version is limited by the number of words per check and the number of tries. Paid plan starts at $19.95 per month for unlimited access, and you can cancel anytime.

  • Smodin

    Starter plan begins at $12.99/month and includes all core AI tools – writer, detector, humanizer, plagiarism checker, rewriter, translator, and AI chat. The all-in-one structure replaces multiple separate subscriptions.

Honest breakdown

Pros & Cons

What works well and what can be annoying for each tool.

QuillBot

Pros

  • Good for rephrasing sentences
  • Integrates Chicago and APA styles for citations
  • Works fine for short texts

Cons

  • The free version only checks a limited number of words
  • AI and plagiarism checks are not fully accurate
  • Long texts sound weird or repeat phrases

Grammarly

Pros

  • Finds grammar and style mistakes easily
  • Suggests tone and clarity improvements
  • Works in browser, apps, and documents

Cons

  • AI detection is only in the paid plan
  • The free version gives a couple of tries and then requires signing up
  • Can't create text from scratch

Smodin

Pros

  • Lets you write, rewrite, and check text all in one place
  • All instruments are easily integrated and available in Chrome
  • Works with many languages

Cons

  • Starter plan has limited writing output – unlimited requires Premium
  • Chrome extension, API access, and bulk processing are Premium-only
Pick your lane

Who Should Use Each Tool?

Depending on what features you need, here's which tool fits best for different people:

Best for

Best for Students

Top choiceSmodin

Students will get a lot from Smodin and QuillBot. Smodin helps check for plagiarism and AI content, and also lets you edit your text. QuillBot is handy for rewriting or rephrasing short assignments or notes, but longer texts might need more checks.

Best for

Best for Teachers

Top choiceSmodin

Teachers will like Smodin and Grammarly. Smodin makes it easy to check students' work and watch for AI content, while Grammarly helps make texts clean, correct, and easy to read.

Best for

Best for SEO Writers

Top choiceSmodin

SEO writers can use Smodin and QuillBot. Smodin helps check text uniqueness, keep an eye on AI content, and edit large amounts of writing. QuillBot works well for rewriting sentences and making text sound more natural, which is great for creating content fast.

Best for

Best for Agencies

Top choiceSmodin

Agencies will benefit from Smodin because it has all the tools in one place and AI Chat to answer more writing and non-writing questions. You can write, edit, and check texts for different clients all at once.

Best for

Best for Large Institutions

Top choiceGrammarly

Large institutions can use Smodin and Grammarly to keep text quality high. Smodin can check lots of materials at once and handle AI content and editing, while Grammarly helps make big documents or teaching materials grammatically correct and clear.

Also consider

Alternatives to Consider

If you want other options for writing or checking text, ChatGPT is worth a look. It doesn't check grammar or plagiarism as well as Grammarly or Smodin, but it's great for quickly creating text and coming up with ideas. For students or writers who need to get something written fast, ChatGPT can be a good alternative

ChatGPT

Good for generating new text and getting ideas.

FAQs

Frequently Asked Questions

Practical answers to the questions teams ask before choosing a writing and originality stack.

It does, but only for shorter texts. For long papers, it might miss some stuff.

Also from Smodin

Explore Smodin Tools

Add these tools to your workflow for stronger quality checks and cleaner final drafts.

01

AI Content Detector

Check likely AI-written passages

02

Plagiarism checker

Validate originality before publishing

03

Writer

Explore this workflow booster

04

AI Chat

Explore this workflow booster

Start in minutes

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Humanize AI text, catch plagiarism, and finish assignments in a fraction of the time. With one workspace built for students, researchers, and teams.

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Tool Comparisons

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Head back to our comparison hub for every matchup, verdict, and side-by-side table in one place.

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