QuillBot vs Spines
Which Writing AI tool is better in 2026?
QuillBot
AI writing suite with the world's most popular paraphraser, grammar checker, and more
Spines
AI-powered publishing platform that helps authors publish books fast
Side-by-side
Spines is the more established option (raised $29M); pricing is comparable on both sides.
| Metric | QuillBot | Spines |
|---|---|---|
| Taglinei | AI writing suite with the world's most popular paraphraser, grammar checker, and more | AI-powered publishing platform that helps authors publish books fast |
| Foundedi | 2017🏆 | 2021 |
| HQi | Chicago, United States | Boynton Beach, US |
| Employeesi | — | 11-50🏆 |
| Neuron scorei | 68🏆 | 50 |
| Total fundingi | $4.3M | $29M🏆 |
| Latest roundi | Acquisition · Aug 2021 | Series A |
| 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 QuillBot and Spines.
| Capability | QuillBot | Spines |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✓ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of QuillBot
- Higher Neuron score (68 vs 50)
- More mature (2017)
🔵 Strengths of Spines
- Has raised more capital ($29M vs $4.3M)
- Offers a free trial
- Newer company (2021)
Which should you choose?
Choose Spines 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 Spines if you want the most established option — it has raised $29M, 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
QuillBot vs Spines — which is better?
It depends on your priority. QuillBot is the leaner option; Spines has broader feature depth. See the side-by-side table above.
Is QuillBot cheaper than Spines?
No — Spines's cheapest paid plan is Free, while QuillBot's is Free.
Do QuillBot and Spines offer free plans?
QuillBot: Yes, has a free plan. Spines: Yes, has a free plan.
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