Castmagic vs Grammarly
Which Productivity AI tool is better in 2026?
Castmagic
Supercharge your media with AI, transforming audio and video into 100+ content assets in minutes.
Grammarly
AI writing assistant for individuals and teams.
Side-by-side
Grammarly leads on both fronts — more capital raised ($1.2B) and a lower entry price than Castmagic.
| Metric | Castmagic | Grammarly |
|---|---|---|
| Taglinei | Supercharge your media with AI, transforming audio and video into 100+ content assets in minutes. | AI writing assistant for individuals and teams. |
| Foundedi | — | 2009🏆 |
| HQi | — | San Francisco, US |
| Employeesi | — | 1001-5000🏆 |
| Neuron scorei | 57 | 84🏆 |
| Total fundingi | Undisclosed | $1.2B🏆 |
| Latest roundi | — | Growth · May 2025 |
| Valuationi | — | $13B🏆 |
| Cheapest paid plani | Hobby · $21/mo | Pro (Annual) · $12/mo🏆 |
| Free plani | ✗ | ✓ Free |
| Free triali | ✓ | ✓ |
| Top tier pricei | Business · $790/mo | Pro (Monthly) · $30/mo |
| Pricing summaryi | 3 published plans | 6 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Castmagic and Grammarly.
| Capability | Castmagic | Grammarly |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✓ |
| SDK languages | — | 1 (JavaScript) |
| Free plan | ✗ | ✓ |
| Free trial | ✓ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✓ |
🟢 Strengths of Castmagic
- Strong in AI Productivity
🔵 Strengths of Grammarly
- Has raised more capital ($1.2B vs Undisclosed)
- Higher Neuron score (84 vs 57)
- Offers a free plan
- Lower starting price ($12/mo)
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
Castmagic vs Grammarly — which is better?
It depends on your priority. Castmagic is the leaner option; Grammarly is cheaper to start. See the side-by-side table above.
Is Castmagic cheaper than Grammarly?
No — Grammarly's cheapest paid plan is Pro (Annual) · $12/mo, while Castmagic's is Hobby · $21/mo.
Do Castmagic and Grammarly offer free plans?
Castmagic: Free trial only. Grammarly: Yes, has a free plan.
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