QuillBot vs Writesonic: Which AI Writing Tool Is Better in 2026?
QuillBot
From $8.33Writesonic
From $16Quick verdict
Overall pick: Writesonic
Pick QuillBot if you mainly need paraphrasing and summarising at a lower starting price, and you value a built-in plagiarism checker. Pick Writesonic if you need SEO optimisation, brand voice, copy templates, and a public API for SEO blog posts or agency work, and you are willing to pay a higher starting price. Neither tool covers every feature: QuillBot lacks templates, brand voice, SEO mode, and an API, while Writesonic lacks a plagiarism checker.
- QuillBot's entry plan ($8.33) is 48% cheaper than Writesonic's ($16).
- Both offer a free plan, so you can test them side by side at no cost.
- Only QuillBot offers: plagiarism checker.
- Only Writesonic offers: copy templates, brand voice / style memory, seo optimisation, public api.
Cost calculator
| Tool | Monthly | Yearly |
|---|---|---|
| QuillBot · flat | $8.33 | $100 |
| Writesonic · flat | $16.00 | $192 |
Based on entry-level paid plans. Prices change, so check the vendor before you buy.
Which one should you choose?
| If you need… | Pick | Why |
|---|---|---|
| Student paraphrasing and summarising sources | QuillBot | QuillBot has a plagiarism checker and is best for students and paraphrasing, at a lower starting price of $8.33 versus $16. |
| Agency producing SEO blog posts | Writesonic | Writesonic has SEO optimisation, brand voice, copy templates, and team workspaces, and is best for SEO blog posts and agencies. |
| Buyer who needs a public API | Writesonic | Writesonic offers a public API; QuillBot does not. |
| Buyer who needs a plagiarism checker | QuillBot | QuillBot includes a plagiarism checker; Writesonic does not. |
| Budget-conscious buyer comparing starting prices | QuillBot | QuillBot starts at $8.33 flat versus Writesonic at $16 flat. |
Feature comparison: QuillBot vs Writesonic
| Feature | ||
|---|---|---|
| Free plan | ✅ | ✅ |
| Starting price | $8.33 /mo | $16 /mo |
| Copy templates | — | ✅ |
| Brand voice / style memory | — | ✅ |
| Plagiarism checker | ✅ | — |
| Browser extension | ✅ | ✅ |
| SEO optimisation | — | ✅ |
| Team workspaces | ✅ | ✅ |
| Multilingual output | ✅ | ✅ |
| Public API | — | ✅ |
Highlighted rows are where the tools differ.
Pros and cons
QuillBot
- Lower starting price at $8.33 flat
- Includes a plagiarism checker
- Browser extension available
- Best for students and paraphrasing
- No copy templates
- No brand voice or style memory
- No SEO optimisation or public API
Writesonic
- SEO optimisation mode
- Brand voice / style memory
- Copy templates and public API
- Best for SEO blog posts and agencies
- Higher starting price at $16 flat
- No plagiarism checker
- No paraphrasing-focused positioning
At a glance
Paraphrasing and summarising toolkit.
Founded 2017 · From $8.33 · 4/8 tracked features
Best for: students, paraphrasing
See QuillBot alternatives →AI writer focused on SEO content.
Founded 2020 · From $16 · 7/8 tracked features
Best for: SEO blog posts, agencies
See Writesonic alternatives →FAQ
Is QuillBot cheaper than Writesonic?
Yes. QuillBot starts at $8.33 flat, while Writesonic starts at $16 flat. Both offer a free plan.
Does QuillBot have SEO optimisation?
No. QuillBot does not list SEO optimisation, while Writesonic does.
Does Writesonic include a plagiarism checker?
No. Writesonic does not list a plagiarism checker, while QuillBot does.
Which tool offers a public API?
Writesonic offers a public API; QuillBot does not.
Which tool is better for agencies?
Writesonic lists agencies among its best-for uses and includes SEO optimisation, brand voice, templates, and team workspaces.
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Data last reviewed: pending verification. All AI Writing tools →