Castle vs Visitor Filters
Castle vs Visitor Filters, 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: Castle is on 60/100 and Visitor Filters on 24/100.
Where each one leads
Castle
- our overall score: 60/100 against 24/100
- domain rating: 66/100 against 5/100
Visitor Filters
Leads on none of the measures we hold for both companies.
At a glance
| Measure | Castle | Visitor Filters |
|---|---|---|
| What it is | Developer-grade infrastructure to stop bots, abuse, and fraud by transforming user behavior into real-time signals. | Protects websites from bots, scrapers, and malicious traffic with real-time IP filtering and geo-blocking. |
| Category | Cybersecurity, Threat Detection, Authentication, API Platform | Cybersecurity, Threat Detection, Web Security, Bot Mitigation |
| Sells toBusiness model | B2B | B2B |
| Offering | Software | Software |
| Founded | 2015 | Not published |
| Headquarters | San Francisco, United States | Silistra, Bulgaria |
| Status | Active | Active |
Size, funding and growth
| Measure | Castle | Visitor Filters |
|---|---|---|
| Employees | 52 | Not published |
| Headcount growthLast 12 months | +24.2% | Not published |
| Total funding | $9.2M | Not published |
| Latest round | Series A | Not published |
| LinkedIn followers | 18,824 | Not published |
StartupHub scores
Our own 0-100 ratings. They measure company strength and site quality, not which product suits you.
| Measure | Castle | Visitor Filters |
|---|---|---|
| StartupHub scoreOur 0-100 rating | 60/100 | 24/100 |
| Traction | 52/100 | Not published |
| Team | 60/100 | Not published |
| Community | 15/100 | 25/100 |
| Search visibility | 36/100 | 12/100 |
| Quality | 68/100 | 35/100 |
| Agent readinessHow well an AI agent can read and act on the site | D (49/100) | D (54/100) |
| Domain ratingLink authority, 0-100 | 66/100 | 5/100 |
Technology
Detected on each public site, so it reflects the marketing stack as well as the product.
| Measure | Castle | Visitor Filters |
|---|---|---|
| Hosting | Netlify | Not detected |
| CDN | Netlify | Cloudflare |
| CMS | Lovable | Not detected |
| Frameworks | Astro, Tailwind CSS | Alpinejs, Tailwind CSS |
| Analytics | Google Analytics 4, Google Tag Manager, PostHog | Not detected |
What users say
| Measure | Castle | Visitor Filters |
|---|---|---|
| Community ratingVisitor votes on StartupHub | Not published | 5.0/5 from 2 votes |
Castle vs Visitor Filters: common questions
Which is better, Castle or Visitor Filters?
On our 0-100 score Castle rates higher (60/100 against 24/100). 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 Castle and Visitor Filters compare on the numbers?
Castle leads on our overall score (60/100 against 24/100), domain rating (66/100 against 5/100).
Read the full Castle review and pricing or the Visitor Filters review and pricing. You can also browse other Castle alternatives we track.