What technologies does Blue21 use?

Blue21 uses Outlook, Google Cloud Hosting, reCAPTCHA, Mobile Friendly, Google Tag Manager. View their full technology stack — including all 9 detected tools — on StackWho.

Who is the Co-Founder and Director of Blue21?

Rutger Dinther is the Co-Founder and Director at Blue21. Get verified contact information on StackWho.

Where is Blue21 located?

Blue21 is based in Rotterdam, South Holland, Netherlands.

Blue21

Q: What industry is Blue21 in?

Blue21 operates in the environmental services industry.

blue21.nl

environmental services

blue21.nl

Rotterdam, South Holland, Netherlands

1-10 employees

LinkedIn Profile

About Blue21

finance, offshore, business development, climate adaptation, floating urban development, real estate, innovation, technology, urban design, water, sustainability, communication, resilience, engineering, ecological design, architecture, entrepreneurship, environmental awareness, financial services, b2b

Blue21's Tech Stack

Decision Makers at Blue21

1 contact

Rutger Dinther

Co-Founder and Director

r***@blue21.nl Sign up to view

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9 technologies detected · 1 decision maker · Emails available

Sales Outreach Angle

WordPress as a CMS signals a content-driven or SMB digital presence. SEO tools, hosting solutions, and page-builder plugins are natural fits for outreach.

Blue21's Position in the StackWho Database

• Blue21 is 1 of 4,079 environmental services companies tracked in StackWho.
• 4,065 environmental services companies in our database have verified decision-maker emails (100% of the cohort).
• 2,034 companies in South Holland are in the StackWho database.
• 1,663 environmental services companies are in the 1-10 employee range (same size as Blue21).

Technology detection from public web signals. Decision-maker contacts compiled from LinkedIn public profiles, company filings, and verified outbound testing. Methodology & sources · Updated July 2026.

Frequently Asked Questions

What technology does Blue21 use?

Blue21 uses Outlook, Google Cloud Hosting, reCAPTCHA, Mobile Friendly, Google Tag Manager, Vimeo, and 3 more technologies. This data is sourced from StackWho's technology detection engine.

How do I contact the decision makers at Blue21?

StackWho has verified email addresses for 1 decision maker at Blue21. Pro members can access direct emails for the CEO, CTO, VP of Engineering, and other key contacts. Use StackWho to reach Blue21 directly for sales, recruiting, or partnerships.

What industry is Blue21 in?

Blue21 operates in the environmental services industry, headquartered in Rotterdam, South Holland, Netherlands. StackWho tracks technology stacks and decision maker contacts for companies across all industries.

Can I export Blue21's contact data?

Yes. StackWho Pro members can export decision maker contact data for Blue21 and similar companies to CSV. Use the export feature to build targeted prospect lists segmented by technology stack, industry, or location.