Castelion vs Shield AI
Which Aerospace AI tool is better in 2026?
Castelion
Mass-producing affordable hypersonic weapons for defense
Shield AI
Autonomous AI software for defence
Side-by-side
Shield AI is the more established option (raised $2.0B); pricing is comparable on both sides.
| Metric | Castelion | Shield AI |
|---|---|---|
| Taglinei | Mass-producing affordable hypersonic weapons for defense | Autonomous AI software for defence |
| Foundedi | 2022 | 2015🏆 |
| HQi | El Segundo, US | San Diego, US |
| Employeesi | 201-500 | 500-1000🏆 |
| Neuron scorei | 76🏆 | 52 |
| Total fundingi | $469M | $2.0B🏆 |
| Latest roundi | Series B · Dec 2025 | Series G · Mar 2026 |
| Valuationi | — | $12.7B🏆 |
| Cheapest paid plani | Pricing not disclosed | — |
| Free plani | ✗ | ✗ |
| Free triali | ✗ | ✗ |
| Top tier pricei | Pricing not disclosed | Hivemind Enterprise · Contact sales |
| Pricing summaryi | Enterprise · Contact sales | 2 published plans |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Castelion and Shield AI.
| Capability | Castelion | Shield AI |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✓ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Castelion
- Higher Neuron score (76 vs 52)
- Newer company (2022)
🔵 Strengths of Shield AI
- Has raised more capital ($2.0B vs $469M)
- More mature (2015)
- Verified profile
Which should you choose?
Choose Shield AI if price matters most — it starts at Enterprise · Contact sales, which is friendlier for teams watching burn. Both AI Aerospace tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Shield AI if you want the most established option — it has raised $2.0B, 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
Castelion vs Shield AI — which is better?
It depends on your priority. Castelion is the leaner option; Shield AI has broader feature depth. See the side-by-side table above.
Is Castelion cheaper than Shield AI?
No — Shield AI's cheapest paid plan is Enterprise · Contact sales, while Castelion's is Enterprise · Contact sales.
Do Castelion and Shield AI offer free plans?
Castelion: Paid only. Shield AI: Paid only.
Explore more AI Aerospace tools
Contextual paths to related AI startups, deals and rankings.