Apex Space vs Castelion
Which Aerospace AI tool is better in 2026?
Apex Space
Productized satellite buses manufactured at scale
Castelion
Mass-producing affordable hypersonic weapons for defense
Side-by-side
Apex Space is the more established option (raised $718M); pricing is comparable on both sides.
| Metric | Apex Space | Castelion |
|---|---|---|
| Taglinei | Productized satellite buses manufactured at scale | Mass-producing affordable hypersonic weapons for defense |
| Foundedi | 2022 | 2022 |
| HQi | — | El Segundo, US |
| Employeesi | 11-50 | 201-500🏆 |
| Neuron scorei | 75 | 76🏆 |
| Total fundingi | $718M🏆 | $469M |
| Latest roundi | Series D · Jun 2026 | Series B · Dec 2025 |
| Valuationi | $2.3B🏆 | — |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✓ | ✗ |
| Free triali | ✓ | ✗ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Free | Enterprise · Contact sales |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Apex Space and Castelion.
| Capability | Apex Space | Castelion |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✗ | ✗ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✓ | ✗ |
| Free trial | ✓ | ✗ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Apex Space
- Has raised more capital ($718M vs $469M)
- Offers a free plan
- Offers a free trial
🔵 Strengths of Castelion
- Higher Neuron score (76 vs 75)
Which should you choose?
Choose Castelion 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 Apex Space if you want the most established option — it has raised $718M, 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
Apex Space vs Castelion — which is better?
It depends on your priority. Apex Space has raised more capital and is the more established option; Castelion has broader feature depth. See the side-by-side table above.
Is Apex Space cheaper than Castelion?
No — Castelion's cheapest paid plan is Enterprise · Contact sales, while Apex Space's is Free.
Do Apex Space and Castelion offer free plans?
Apex Space: Yes, has a free plan. Castelion: Paid only.
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