Open's tech stack
What does Open use?
Open (open.de) uses at least 15 tools we can see from public records, including maxcluster for hosting, Microsoft 365 for email and documents, HubSpot for sales and WordPress for its website. Last checked .
- Tools found
- 15
- Categories
- 8
- Layers
- 4 of 5
- Last checked
- Oct 2026
Open'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
1 tool, where the bytes are served from
Hosting & Cloud
Application
2 tools, what the product is built with
Frontend
Go-to-market
5 tools, how they find and keep customers
Website & CMS
Marketing
Sales & CRM
Company Ops
7 tools, what the team runs on day to day
Dev Tools
Security & Compliance
Companies like Open also use
Tools common among companies with a similar stack that we haven't found at Open.
Companies with a stack like Open's
Ranked by shared tools, with rare tools counting more.
Open tech stack FAQ
What tools does Open use?
We've found 15 tools at Open (open.de). Edge & Hosting: maxcluster. Application: jQuery and Vue.js. Go-to-market: WordPress, Yoast SEO and HubSpot. Company Ops: Microsoft 365, Google Workspace and Apple Business. Last checked October 4, 2026.
What cloud does Open run on?
Open uses maxcluster for hosting. We found maxcluster through custom domain.
What CRM does Open use?
Open uses HubSpot for sales and CRM. We found HubSpot through website code.
What email provider does Open use?
Open uses Microsoft 365, Google Workspace and Apple Business for email and documents. We found Microsoft 365 through DNS verification records.
What CMS does Open use?
Open uses WordPress, Yoast SEO and Elementor for its website. We found WordPress through website code.
Does Open use Microsoft 365?
Yes. We found Microsoft 365 at Open through DNS verification records. Microsoft 365 is used by 542,448 companies we track.
How does runsonwhat know what Open uses?
We read public traces only: Open'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.