Castelion vs RSI Europe
Castelion vs RSI Europe, compared side by side on 14 data points: what each one does, how big it is, what it has raised, the tech running each site, and what users report. We score both out of 100 on traction, team and visibility: Castelion is on 60/100 and RSI Europe on 37/100.
Where each one leads
Castelion
- our overall score: 60/100 against 37/100
- funding raised: $1.1B against $40K
RSI Europe
Leads on none of the measures we hold for both companies.
At a glance
| Measure | Castelion | RSI Europe |
|---|---|---|
| What it is | Defense startup mass-producing affordable hypersonic missile systems for the U.S. military, founded by ex-SpaceX engineers. | Lithuania-based defence tech company building remote-controlled explosive systems and drone technologies for rapid deployment. |
| Category | Defense, Hypersonic, Missiles, Aerospace | Defense, Aerospace, Robotics, IoT |
| Sells toBusiness model | B2G | B2G |
| Offering | Hardware | Hardware |
| Founded | 2022 | 2022 |
| Headquarters | El Segundo, United States | Vilnius, Lithuania |
| Status | Active | Active |
Size, funding and growth
| Measure | Castelion | RSI Europe |
|---|---|---|
| Employees | 100 | Not published |
| Total funding | $1.1B | $40K |
| Latest round | Series C | Bootstrapped |
| Valuation | $13B | Not published |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Castelion | RSI Europe |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 60/100 | 37/100 |
| Traction | 58/100 | 23/100 |
| Team | 10/100 | 30/100 |
| Search visibility | 29/100 | 14/100 |
| Quality | 78/100 | 48/100 |
| Agent readinessHow well an AI agent can read and act on the site | F (39/100) | Not published |
| Domain ratingLink authority, 0-100 | 43/100 | Not published |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Castelion | RSI Europe |
|---|---|---|
| CDN | Cloudflare | Not detected |
| CMS | WordPress | Not detected |
| Frameworks | Jquery, Bootstrap | Not detected |
| Analytics | Google Tag Manager | Not detected |
What users say
| Measure | Castelion | RSI Europe |
|---|---|---|
| Reddit sentimentThreads we track | 1 positive, 3 negative across 6 threads | Not published |
“Hypersonic weapon startup Castelion wins $105 million Navy contract for F/A-18 integration. Castelion, a small California defense startup, has won a $105 million U.S. Navy contract to ready its Blackbeard hypersonic missile for use aboard ”r/FighterJets
Castelion vs RSI Europe: common questions
Which is better, Castelion or RSI Europe?
On our 0-100 score Castelion rates higher (60/100 against 37/100). The score weights traction, team, visibility and profile completeness, so it reflects company strength rather than which product suits you. We compare the two on 14 data points above: read the rows that match what you are buying for.
How do Castelion and RSI Europe compare on the numbers?
Castelion leads on our overall score (60/100 against 37/100), funding raised ($1.1B against $40K).
What do real users say about Castelion and RSI Europe?
Castelion: 1 positive and 3 negative mentions across 6 Reddit threads we track, mostly in r/FighterJets.
Read the full Castelion review and pricing or the RSI Europe review and pricing. You can also browse other Castelion alternatives we track.