# What does Castlebook use?

Castlebook (castlebook.com) shows public evidence of 8 tools, according to runsonwhat (last checked 2026-10-06).

- Industry: Real Estate
- Size: 11–50 employees
- Based in: Estonia
- Founded: 2015
- LinkedIn: https://www.linkedin.com/company/castlebook

## Edge & Hosting

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Vercel](https://www.runsonwhat.com/reverse/vercel) | Hosting & Cloud | Custom domain, DNS records, Website code |  |

## Application

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Next.js](https://www.runsonwhat.com/reverse/nextjs) | Frontend | Website code |  |
| [Firebase](https://www.runsonwhat.com/reverse/firebase) | Backend & Database | DNS verification records |  |

## Data & Observability

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Google Analytics](https://www.runsonwhat.com/reverse/ga) | Analytics | Website code |  |

## Go-to-market

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Zoho](https://www.runsonwhat.com/reverse/zoho) | Sales & CRM | DNS verification records, Email records |  |

## Company Ops

| Tool | Category | Evidence | Since |
|---|---|---|---|
| [Amazon SES](https://www.runsonwhat.com/reverse/ses) | Email Delivery | Email records |  |
| [Resend](https://www.runsonwhat.com/reverse/resend) | Email Delivery | Email records |  |

## FAQ

### What tools does Castlebook use?

As of October 2026, runsonwhat has found 8 tools at Castlebook (castlebook.com) in public records. Edge & Hosting: Vercel. Application: Next.js and Firebase. Data & Observability: Google Analytics. Go-to-market: Zoho. Company Ops: Amazon SES and Resend. Last checked October 6, 2026.

### What cloud does Castlebook run on?

Castlebook uses Vercel for hosting and cloud infrastructure, according to runsonwhat (October 2026). runsonwhat found Vercel through a subdomain that points at Vercel and DNS records. Vercel is used by 46,321 companies runsonwhat tracks.

### What CRM does Castlebook use?

Castlebook uses Zoho for its CRM, according to runsonwhat (October 2026). runsonwhat found Zoho through a DNS verification record for Zoho and email records. Zoho is used by 61,548 companies runsonwhat tracks.

### What analytics tools does Castlebook use?

Castlebook uses Google Analytics for analytics, according to runsonwhat (October 2026). runsonwhat found Google Analytics through Google Analytics code on castlebook.com. Google Analytics is used by 850,248 companies runsonwhat tracks.

### Does Castlebook use Next.js?

Yes. runsonwhat found Next.js at Castlebook through Next.js code on castlebook.com. Next.js is a Frontend tool used by 64,111 companies runsonwhat tracks.

### How does runsonwhat know what Castlebook uses?

runsonwhat reads public records only. Of the 8 tools at Castlebook, 3 were found through DNS records, 2 through code on castlebook.com, 2 through email records and 1 through subdomains that point at the vendor. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and castlebook.com about monthly.


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Source: runsonwhat, https://www.runsonwhat.com/company/castlebook.com (updated October 2026). Counts are companies with direct public evidence of the tool (DNS records, certificates, website code, a real-browser crawl, subprocessor lists), so they are lower bounds. Methodology: https://www.runsonwhat.com/methodology.