Castelion vs CX2
Which Defense AI AI tool is better in 2026?
Castelion
Mass-producing affordable hypersonic weapons for defense
CX2
AI-enabled electronic warfare across the electromagnetic spectrum
Side-by-side
Castelion is the more established option (raised $469M); pricing is comparable on both sides.
| Metric | Castelion | CX2 |
|---|---|---|
| Taglinei | Mass-producing affordable hypersonic weapons for defense | AI-enabled electronic warfare across the electromagnetic spectrum |
| Foundedi | 2022🏆 | 2024 |
| HQi | El Segundo, US | — |
| Employeesi | 201-500🏆 | 11-50 |
| Neuron scorei | 76🏆 | 71 |
| Total fundingi | $469M🏆 | $46M |
| Latest roundi | Series B · Dec 2025 | Series A |
| 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 | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Castelion and CX2.
| Capability | Castelion | CX2 |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✓ |
| Free trial | ✗ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Castelion
- Has raised more capital ($469M vs $46M)
- Higher Neuron score (76 vs 71)
- More mature (2022)
🔵 Strengths of CX2
- Offers a free plan
- Offers a free trial
- Newer company (2024)
Which should you choose?
Choose CX2 if price matters most — it starts at Free, 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 $469M, 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 CX2 — which is better?
It depends on your priority. Castelion has raised more capital and is the more established option; CX2 has broader feature depth. See the side-by-side table above.
Is Castelion cheaper than CX2?
No — CX2's cheapest paid plan is Free, while Castelion's is Enterprise · Contact sales.
Do Castelion and CX2 offer free plans?
Castelion: Paid only. CX2: Yes, has a free plan.
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