kastus.com
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Kastus: The Invisible Shield for Solar
Deep dive into a €5M biotech startup solving solar's biggest maintenance headache
While the solar industry obsesses over panel efficiency, Kastus is quietly solving the real-world problem that slashes output: soiling. Their photocatalytic coating turns every solar panel into a self-cleaning machine, using sunlight to break down dirt and grime automatically.
"Kastus isn't selling coatings—they're selling the end of manual solar panel cleaning."
The Physics of Clean
When embedded into PV panel glass, Kastus' photocatalytic technology becomes super-hydrophilic. Under sunlight, it generates free radicals that break down organic matter on contact. The result? A surface that literally repels dirt using the same UV rays that generate power. This isn't a chemical additive—it's engineered surface chemistry.
Biotech in a Solar World
Listed as 'Biotech' with just 33 employees, Kastus operates like a specialized materials science lab. Founder John Browne—CEO and self-described 'average golfer'—leads a team focused on two distinct verticals: anti-soiling for solar panels and antimicrobial coatings for surfaces. This dual-track approach suggests they're leveraging core photocatalytic IP across multiple high-margin markets.
The traffic data reveals a company in stealth growth mode. With only 366 monthly visits and 'undefined' as their top traffic source (77.4%), Kastus isn't chasing B2C eyeballs. This is enterprise-grade tech sold through direct channels, where website traffic is a vanity metric compared to boardroom conversations. Their 44% organic search share, while small in absolute numbers, shows they're building brand recognition in a niche where technical buyers do deep research.
- €5.1M revenue with 33 employees = ~€155K revenue per employee
- Bootstrap mentality: No public funding rounds listed
- Dual market play: Solar anti-soiling + antimicrobial surfaces
- Tech stack includes React and Zendesk—modern but pragmatic
- Founder-led sales: CEO John Browne is the face of the company
The Quiet Giant in Clean Tech
Kastus proves that in deep tech, revenue beats hype and patents beat press releases. With €5.1M in revenue and a focused team, they're building the invisible infrastructure that makes solar work better—no fanfare required.
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Meta Tags
Kastus Anti-Soiling Surface Technology
Kastus is a smart photocatalytic surface technology. When embedded into PV (Solar) panel cover glass it is super-hydrophilic and creates free radicals to break down organic matter. Creating a self cleaning solar panel.
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About kastus.com
Kastus is a smart photocatalytic surface technology. When embedded into PV (Solar) panel cover glass it is super-hydrophilic and creates free radicals to break down organic matter. Creating a self cleaning solar panel.
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Technology Stack
kastus.com uses 13 technologies across their website including Font Awesome, HSTS, Sentry, and more.
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Font Awesome
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HSTS
Error Tracking
Sentry
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Wix
Customer Support
Zendesk
Performance
Lazy Loading
Traffic & Audience
kastus.com receives approximately 366 monthly visitors. The website has a bounce rate of 41% with visitors viewing an average of 1.4 pages per visit. Users spend an average of 0:03 on the site.
The majority of kastus.com's traffic comes from undefined, .
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