Grammarly vs Vellum
Which Agents AI tool is better in 2026?
Grammarly
AI writing assistant for individuals and teams.
Vellum
An AI Assistant that adapts to how you work, acts before you ask, and is entirely yours to customize.
Side-by-side
Grammarly leads on both fronts — more capital raised ($1.2B) and a lower entry price than Vellum.
| Metric | Grammarly | Vellum |
|---|---|---|
| Taglinei | AI writing assistant for individuals and teams. | An AI Assistant that adapts to how you work, acts before you ask, and is entirely yours to customize. |
| Foundedi | 2009🏆 | — |
| HQi | San Francisco, US | US |
| Employeesi | 1001-5000🏆 | 1-10 |
| Neuron scorei | 84🏆 | 59 |
| Total fundingi | $1.2B🏆 | Undisclosed |
| Latest roundi | Growth · May 2025 | — |
| Valuationi | $13B🏆 | — |
| Cheapest paid plani | Pro (Annual) · $12/mo🏆 | — |
| Free plani | ✓ Free | ✓ Free |
| Free triali | ✓ | ✓ |
| Top tier pricei | Pro (Monthly) · $30/mo | — |
| Pricing summaryi | 6 published plans | 1 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Grammarly and Vellum.
| Capability | Grammarly | Vellum |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✓ | ✗ |
| SDK languages | 1 (JavaScript) | 1 (CLI) |
| Free plan | ✓ | ✓ |
| Free trial | ✓ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✓ | ✗ |
🟢 Strengths of Grammarly
- Has raised more capital ($1.2B vs Undisclosed)
- Higher Neuron score (84 vs 59)
- Lower starting price ($12/mo)
- Newer company (2009)
🔵 Strengths of Vellum
- Strong in AI Agents
Which should you choose?
Choose Grammarly if price matters most — it starts at Free · From $12/mo, which is friendlier for teams watching burn. Both AI Agents tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Grammarly if you want the most established option — it has raised $1.2B, 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.
💸 Deals
7-day free trial of Grammarly Premium
Try Grammarly Premium free for 7 days — AI writing assistant used by 30M+ daily.
Frequently asked questions
Grammarly vs Vellum — which is better?
It depends on your priority. Grammarly has raised more capital and is the more established option; Vellum has broader feature depth. See the side-by-side table above.
Is Grammarly cheaper than Vellum?
Yes — Grammarly's cheapest paid plan is Pro (Annual) · $12/mo, while Vellum's is Free.
Do Grammarly and Vellum offer free plans?
Grammarly: Yes, has a free plan. Vellum: Yes, has a free plan.
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