Castelion vs Reflex Aerospace
Which Aerospace AI tool is better in 2026?
Castelion
Mass-producing affordable hypersonic weapons for defense
Reflex Aerospace
Side-by-side
Castelion is the more established option (raised $469M); pricing is comparable on both sides.
| Metric | Castelion | Reflex Aerospace |
|---|---|---|
| Taglinei | Mass-producing affordable hypersonic weapons for defense | — |
| Foundedi | 2022 | 2021🏆 |
| HQi | El Segundo, US | Berlin, Germany |
| Employeesi | 201-500🏆 | 11-50 |
| Neuron scorei | 76🏆 | 61 |
| Total fundingi | $469M🏆 | $57.4M |
| 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 Reflex Aerospace.
| Capability | Castelion | Reflex Aerospace |
|---|---|---|
| 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 $57.4M)
- Higher Neuron score (76 vs 61)
- Newer company (2022)
🔵 Strengths of Reflex Aerospace
- Offers a free plan
- Offers a free trial
- More mature (2021)
Which should you choose?
Choose Reflex Aerospace if price matters most — it starts at Free, 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 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 Reflex Aerospace — which is better?
It depends on your priority. Castelion has raised more capital and is the more established option; Reflex Aerospace has broader feature depth. See the side-by-side table above.
Is Castelion cheaper than Reflex Aerospace?
No — Reflex Aerospace's cheapest paid plan is Free, while Castelion's is Enterprise · Contact sales.
Do Castelion and Reflex Aerospace offer free plans?
Castelion: Paid only. Reflex Aerospace: Yes, has a free plan.
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