Castelion vs Seeing Systems
Which Defense AI AI tool is better in 2026?
Castelion
Mass-producing affordable hypersonic weapons for defense
Seeing Systems
Modular AI-commanded autonomous strike drones built for contested combat environments.
Side-by-side
Castelion is the more established option (raised $1.2B); pricing is comparable on both sides.
| Metric | Castelion | Seeing Systems |
|---|---|---|
| Taglinei | Mass-producing affordable hypersonic weapons for defense | Modular AI-commanded autonomous strike drones built for contested combat environments. |
| Foundedi | 2022🏆 | 2025 |
| HQi | El Segundo, US | London, GB |
| Employeesi | 201-500 | 11-50🏆 |
| Neuron scorei | 71🏆 | 42 |
| Total fundingi | $1.2B🏆 | $500K |
| Latest roundi | series-c · Aug 2026 | Seed · Jan 2026 |
| 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 | Enterprise · Contact sales | Contact-sales |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Castelion and Seeing Systems.
| Capability | Castelion | Seeing Systems |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✗ |
| Free trial | ✗ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Castelion
- Has raised more capital ($1.2B vs $500K)
- Higher Neuron score (71 vs 42)
- More mature (2022)
🔵 Strengths of Seeing Systems
- Newer company (2025)
Which should you choose?
Choose Seeing Systems if price matters most — it starts at Contact-sales, which is friendlier for teams watching burn. Both Defense AI tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Castelion 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.
Frequently asked questions
Castelion vs Seeing Systems — which is better?
It depends on your priority. Castelion has raised more capital and is the more established option; Seeing Systems has broader feature depth. See the side-by-side table above.
Is Castelion cheaper than Seeing Systems?
No — Seeing Systems's cheapest paid plan is Contact-sales, while Castelion's is Enterprise · Contact sales.
Do Castelion and Seeing Systems offer free plans?
Castelion: Paid only. Seeing Systems: Paid only.
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