runsonwhat

Castor's tech stack

What does Castor use?

Castor (castoredc.com) uses at least 47 tools we can see from public records, including Microsoft Azure for hosting, Microsoft 365 for email and documents, Salesforce for sales and Zendesk for customer support. Last checked .

Industry
Software
Size
201–1,000 employees
Based in
New York, United States
Founded
2012
LinkedIn
Company page
Re-check liveVisit castoredc.com
Tools found
47
Categories
16
Oldest proven tool
May 2018
Last checked
Oct 2026

Castor's stack, layer by layer

Each tool links to the other companies we've found using it. The label says what kind of public trace gave it away.

Edge & Hosting

3 tools, where the bytes are served from

Hosting & Cloud

CDN & Edge

Application

9 tools, what the product is built with

Frontend

Backend & Database

AI

Media & UI

Data & Observability

3 tools, what they measure and store

Analytics

Go-to-market

15 tools, how they find and keep customers

Website & CMS

Marketing

Ads & Pixels

Sales & CRM

Support & Docs

Company Ops

17 tools, what the team runs on day to day

Email Delivery

Workspace

Dev Tools

Security & Compliance

What changed at Castor

Using since

Dates come from the first certificate of the subdomain that points at the tool.

  1. WP Engine
  2. Microsoft Azure

Companies like Castor also use

Tools common among companies with a similar stack that we haven't found at Castor.

Companies with a stack like Castor's

Ranked by shared tools, with rare tools counting more.

More Software companies

Other Software companies we've checked.

Castor tech stack FAQ

What tools does Castor use?

We've found 47 tools at Castor (castoredc.com). Edge & Hosting: Cloudflare, Microsoft Azure and WP Engine. Application: jQuery, Google Fonts and Vimeo. Data & Observability: Google Analytics, Google Tag Manager and Microsoft Clarity. Go-to-market: Meta Pixel, Google Ads and WordPress. Company Ops: Microsoft 365, Google Workspace and SendGrid. Last checked October 4, 2026.

What cloud does Castor run on?

Castor uses Microsoft Azure and WP Engine for hosting. We found Microsoft Azure through custom domain and DNS records since December 2022.

What CRM does Castor use?

Castor uses Salesforce and Calendly for sales and CRM. We found Salesforce through email records.

What email provider does Castor use?

Castor uses Microsoft 365, Google Workspace and Apple Business for email and documents. We found Microsoft 365 through DNS verification records.

What does Castor use for customer support?

Castor uses Zendesk for customer support. We found Zendesk through email records.

What analytics tools does Castor use?

Castor uses Google Analytics, Google Tag Manager and Microsoft Clarity for analytics. We found Google Analytics through website code.

Does Castor use Microsoft 365?

Yes. We found Microsoft 365 at Castor through DNS verification records. Microsoft 365 is used by 245,233 companies we track.

How does runsonwhat know what Castor uses?

We read public traces only: Castor's DNS and email records, certificate logs, the code its website loads, and published subprocessor lists. A tool is listed only when a direct record backs it up. DNS is rechecked weekly and the website monthly.

We read public traces only: DNS and email records, certificate logs, website code and published subprocessor lists. A tool is listed when a direct record backs it up, and dropped when a recheck no longer finds it. Is this your company? See how to opt out.