Smodin vs QuillBot: Which Tool Is Better?

Neither Smodin nor QuillBot reliably beats AI detection. Both are paraphrasers — they swap words and rearrange sentences without changing the underlying patterns that AI detectors measure. Smodin offers more tools (AI writing, detection, plagiarism checking) at a higher price. QuillBot is cheaper, more polished, and better at basic paraphrasing. But if your goal is passing AI detection, you need a different category of tool entirely.

Disclosure: This comparison is published by HumanizeThisAI, an AI humanizer tool. We explain why paraphrasers fall short for AI detection — and yes, we offer an alternative. Pricing and features verified March 2026.

Quick Comparison: Smodin vs QuillBot

How Much Do Smodin and QuillBot Cost?

Smodin Pricing

Smodin splits its features across two main plans, which is a bit unusual. The Writing plan ($8.10/month or $97.20/year) gives you paraphrasing, the AI writer, summarizer, and a 7-day Chrome extension trial. But if you want AI detection, plagiarism checking, and grading tools, you need the Reviewing plan at $14.50/month ($174/year).

They also offer a pay-as-you-go option: $30 one-time for 3,000 credits covering AI detection, plagiarism checks, and readability analysis. That's actually a decent deal if you only need occasional checks rather than a monthly subscription.

QuillBot Pricing

QuillBot is simpler. One Premium plan at $4.17/month when billed annually ($49.95/year). Teams are available as a separate enterprise offering.

Premium gives you unlimited paraphrasing across all seven modes, 20 pages of plagiarism checking per month, advanced grammar checking, tone adjustment, and the full Chrome extension.

Value Comparison

If you just need paraphrasing: QuillBot wins. It's cheaper, has more paraphrase modes (7 vs Smodin's 1), and its Chrome extension is more mature.

If you need an all-in-one writing suite with AI generation, detection, and paraphrasing: Smodin offers more. But you'll pay $14.50/month for the full feature set, making it 75% more expensive than QuillBot.

Where Smodin Wins

Built-in AI detector. Smodin includes an AI content detection tool that claims 98% accuracy at identifying human, AI, and mixed content. It flags specific sentences likely generated by AI, which helps you identify which parts of your text need the most work. QuillBot has no equivalent.

AI writing tool. Smodin includes a full AI writer alongside its paraphraser. If you want to generate drafts and then refine them in the same tool, Smodin lets you do that. QuillBot is purely a post-writing tool — it works on text you've already written or generated elsewhere.

Translation depth. Smodin supports over 100 languages for its paraphrasing and writing tools. QuillBot has translation features but they're more basic in comparison.

Auto citation. Smodin generates citations automatically, which is genuinely useful for academic work. QuillBot doesn't offer this.

Where QuillBot Wins

Better paraphrasing. This is QuillBot's core product, and it shows. Seven distinct paraphrase modes — Standard, Fluency, Formal, Simple, Creative, Expand, and Shorten — give you real control over how the output sounds. Smodin's rewriter is more basic and doesn't offer this level of customization.

Polish and UX. QuillBot has been around longer and it feels more refined. The interface is cleaner, the Chrome extension works seamlessly across more platforms, and the grammar checking is on par with Grammarly. Smodin tries to do more but the individual features can feel rougher.

Student-friendly pricing. QuillBot Premium is $4.17/month billed annually ($49.95/year) — affordable for students. Smodin doesn't offer student pricing.

Tone adjustment. QuillBot's tone feature lets you shift writing between formal, casual, professional, academic, and other tones. This is subtle but useful for adapting a single draft to different contexts.

The Big Question: Can Either Tool Beat AI Detection?

This is why most people are comparing these tools in the first place. You have AI-generated text. You want to paraphrase it so it doesn't get flagged. Does it work?

Short answer: not reliably.

These numbers aren't terrible, but they're far from reliable. A 35-45% bypass rate means more than half the time, your paraphrased text still gets flagged. That's not a strategy — it's a coin flip.

Originality.ai claims a 99% success rate at catching paraphrased AI content. Turnitin has also trained specifically to detect paraphrased AI text. These tools know what QuillBot and Smodin do, and they've adapted.

What Actually Works for Bypassing AI Detection?

The difference between paraphrasing and humanization is fundamental. Paraphrasing swaps words while keeping the same sentence structures. Semantic humanization reconstructs text at the meaning level — different sentence structures, different rhythm, different vocabulary distribution. The output says the same thing, but the statistical fingerprint is completely different.

Dedicated AI humanizers like HumanizeThisAI target the specific metrics that detectors measure. Instead of swapping “important” with “significant,” they rebuild the entire sentence with a different structure, length, and rhythm. The result drops detection scores from 90%+ to under 5% across major detectors.

We wrote a detailed breakdown of how to humanize AI text in 2026 that covers the three methods that actually work.

Which Tool Should You Choose?

Choose QuillBot If:

• You need a quality paraphraser for rewriting your own human-written content (see our full QuillBot review for more detail)
• Grammar checking is important to your workflow
• You want a polished Chrome extension for in-browser paraphrasing
• You're a student looking for the cheapest option ($4.17/mo billed annually)
• You need tone adjustment across formal, casual, and academic styles

Choose Smodin If:

• You want AI writing and paraphrasing in the same tool (read our in-depth Smodin review)
• Built-in AI detection is useful for your workflow
• You need auto-citation for academic work
• Translation across 100+ languages is important
• You prefer a pay-as-you-go option over monthly subscriptions

Choose a Dedicated Humanizer If:

• Your primary goal is passing AI detection (Turnitin, GPTZero, Originality.ai)
• You're submitting AI-assisted work to a school or publisher
• You've already tried QuillBot or Smodin and still got flagged — learn why humanizers and paraphrasers are fundamentally different
• You need consistent, reliable bypass rates above 90%

See how humanizers compare to paraphrasers in our best AI humanizer tools 2026 comparison.

Final Verdict

For pure paraphrasing: QuillBot. It's cheaper, more refined, has more paraphrase modes, and its Chrome extension is better. If your goal is simply rewording text for clarity, readability, or to avoid plagiarism in your own human-written work, QuillBot is the better tool.

For an all-in-one writing suite: Smodin. If you want AI generation, paraphrasing, detection, plagiarism checking, and citation tools in one place, Smodin offers more breadth. The individual features aren't as polished as dedicated competitors, but the convenience of having everything under one roof has real value.

For AI detection bypass: neither. Both tools operate at the paraphrase level, which modern AI detectors have learned to see through. If passing Turnitin, GPTZero, or Originality.ai is your actual goal, you need semantic reconstruction, not synonym swapping.