Castelion vs Perennial Autonomy
Which Defense AI AI tool is better in 2026?
Castelion
Mass-producing affordable hypersonic weapons for defense
Perennial Autonomy
AI-powered counter-drone interceptors proven in Ukraine
Side-by-side
Castelion is the more established option (raised $1.2B); pricing is comparable on both sides.
| Metric | Castelion | Perennial Autonomy |
|---|---|---|
| Taglinei | Mass-producing affordable hypersonic weapons for defense | AI-powered counter-drone interceptors proven in Ukraine |
| Foundedi | 2022🏆 | 2023 |
| HQi | El Segundo, US | El Segundo, United States |
| Employeesi | 201-500🏆 | — |
| Neuron scorei | 71🏆 | 28 |
| Total fundingi | $1.2B🏆 | Undisclosed |
| Latest roundi | series-c · Aug 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 | Custom |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Castelion and Perennial Autonomy.
| Capability | Castelion | Perennial Autonomy |
|---|---|---|
| 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 Undisclosed)
- Higher Neuron score (71 vs 28)
- More mature (2022)
🔵 Strengths of Perennial Autonomy
- Newer company (2023)
Which should you choose?
Choose Perennial Autonomy if price matters most — it starts at Custom, 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 Perennial Autonomy — which is better?
It depends on your priority. Castelion has raised more capital and is the more established option; Perennial Autonomy has broader feature depth. See the side-by-side table above.
Is Castelion cheaper than Perennial Autonomy?
No — Perennial Autonomy's cheapest paid plan is Custom, while Castelion's is Enterprise · Contact sales.
Do Castelion and Perennial Autonomy offer free plans?
Castelion: Paid only. Perennial Autonomy: Paid only.
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