Grammarly vs Success.co
Which Productivity AI tool is better in 2026?
Grammarly
AI writing assistant for individuals and teams.
Success.co
Next-gen software to run the EOS business operating system
Side-by-side
Grammarly leads on both fronts — more capital raised ($1.2B) and a lower entry price than Success.co.
| Metric | Grammarly | Success.co |
|---|---|---|
| Taglinei | AI writing assistant for individuals and teams. | Next-gen software to run the EOS business operating system |
| Foundedi | 2009🏆 | — |
| HQi | San Francisco, US | — |
| Employeesi | 1001-5000🏆 | — |
| Neuron scorei | 84🏆 | 58 |
| Total fundingi | $1.2B🏆 | Undisclosed |
| Latest roundi | Growth · May 2025 | — |
| Valuationi | $13B🏆 | — |
| Cheapest paid plani | Pro (Annual) · $12/mo🏆 | Pricing not disclosed |
| Free plani | ✓ Free | ✗ |
| Free triali | ✓ | ✓ |
| Top tier pricei | Pro (Monthly) · $30/mo | Pricing not disclosed |
| Pricing summaryi | 6 published plans | Free trial |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Grammarly and Success.co.
| Capability | Grammarly | Success.co |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✓ | ✓ |
| SDK languages | 1 (JavaScript) | — |
| Free plan | ✓ | ✗ |
| Free trial | ✓ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✓ | ✗ |
🟢 Strengths of Grammarly
- Has raised more capital ($1.2B vs Undisclosed)
- Higher Neuron score (84 vs 58)
- Offers a free plan
- Lower starting price ($12/mo)
🔵 Strengths of Success.co
- Strong in AI Productivity
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 Productivity 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 Success.co — which is better?
It depends on your priority. Grammarly has raised more capital and is the more established option; Success.co has broader feature depth. See the side-by-side table above.
Is Grammarly cheaper than Success.co?
Yes — Grammarly's cheapest paid plan is Pro (Annual) · $12/mo, while Success.co's is Free trial.
Do Grammarly and Success.co offer free plans?
Grammarly: Yes, has a free plan. Success.co: Free trial only.
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