runsonwhat

O3's tech stack

What does O3 use?

O3 (o3.nu) uses at least 9 tools we can see from public records, including Microsoft 365 for email and documents, WordPress for its website, Flowmailer for email delivery and CookieYes for security. Last checked .

Industry
Human Resources
Size
11–50 employees
Based in
Venlo, Netherlands
LinkedIn
Company page
Re-check liveVisit o3.nu
Tools found
9
Categories
7
Layers
3 of 5
Last checked
Oct 2026

O3'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.

Application

3 tools, what the product is built with

Frontend

Media & UI

Go-to-market

3 tools, how they find and keep customers

Website & CMS

Marketing

Company Ops

3 tools, what the team runs on day to day

Email Delivery

Workspace

Security & Compliance

Companies like O3 also use

Tools common among companies with a similar stack that we haven't found at O3.

Companies with a stack like O3's

Ranked by shared tools, with rare tools counting more.

O3 tech stack FAQ

What tools does O3 use?

As of October 2026, runsonwhat has found 9 tools at O3 (o3.nu) in public records. Application: jQuery, Google Fonts and Font Awesome. Go-to-market: WordPress and Yoast SEO. Company Ops: Microsoft 365, CookieYes and Flowmailer. Last checked October 6, 2026.

What email provider does O3 use?

O3 uses Microsoft 365 for email and office software, according to runsonwhat (October 2026). runsonwhat found Microsoft 365 through a DNS verification record for Microsoft 365 and email records. Microsoft 365 is used by 700,623 companies runsonwhat tracks.

What is O3's website built with?

O3 uses WordPress for its website, alongside Yoast SEO, according to runsonwhat (October 2026). runsonwhat found WordPress through WordPress code on o3.nu. WordPress is used by 581,331 companies runsonwhat tracks.

Does O3 use jQuery?

Yes. runsonwhat found jQuery at O3 through jQuery code on o3.nu. jQuery is a Frontend tool used by 895,910 companies runsonwhat tracks.

Which companies have a tech stack similar to O3's?

The companies with the stacks most like O3's are Het Nieuwe Eemland, Westmore, WeY and NL Investeert, according to runsonwhat (October 2026). Each shares 3 to 9 tools with O3, and rare tools count for more than common ones like Google Workspace, so the match reflects real stack choices.

How does runsonwhat know what O3 uses?

runsonwhat reads public records only. Of the 9 tools at O3, 6 were found through code on o3.nu, 2 through DNS records and 1 through email records. A tool is listed only when a direct record backs it up; DNS is rechecked weekly and o3.nu about 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.