GPTZero vs QuillBot
Which Writing AI tool is better in 2026?
GPTZero
AI detection and writing authenticity for educators and organizations
QuillBot
AI writing suite with the world's most popular paraphraser, grammar checker, and more
Side-by-side
GPTZero is the more established option (raised $13.5M); pricing is comparable on both sides.
| Metric | GPTZero | QuillBot |
|---|---|---|
| Taglinei | AI detection and writing authenticity for educators and organizations | AI writing suite with the world's most popular paraphraser, grammar checker, and more |
| Foundedi | 2022 | 2017🏆 |
| HQi | New York, US | Chicago, United States |
| Employeesi | 11-50🏆 | — |
| Neuron scorei | 67 | 68🏆 |
| Total fundingi | $13.5M🏆 | $4.3M |
| Latest roundi | Series A | Acquisition · Aug 2021 |
| Valuationi | — | — |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✓ | ✓ |
| Free triali | ✓ | ✗ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Free | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for GPTZero and QuillBot.
| Capability | GPTZero | QuillBot |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✓ | ✓ |
| Free trial | ✓ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of GPTZero
- Has raised more capital ($13.5M vs $4.3M)
- Offers a free trial
- Newer company (2022)
🔵 Strengths of QuillBot
- Higher Neuron score (68 vs 67)
- More mature (2017)
Which should you choose?
Choose QuillBot if price matters most — it starts at Free, which is friendlier for teams watching burn. Both AI Writing tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose GPTZero if you want the most established option — it has raised $13.5M, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
GPTZero vs QuillBot — which is better?
It depends on your priority. GPTZero has raised more capital and is the more established option; QuillBot has broader feature depth. See the side-by-side table above.
Is GPTZero cheaper than QuillBot?
No — QuillBot's cheapest paid plan is Free, while GPTZero's is Free.
Do GPTZero and QuillBot offer free plans?
GPTZero: Yes, has a free plan. QuillBot: Yes, has a free plan.
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