Tabs & Spaces

What Tabs & Spaces does

Tabs & Spaces is a Rotterdam-based digital development bureau founded in April 2018 by Evert Slagter (Partner & Digital Consultant) and Harro Heijboer (Partner & Tech Lead). The firm specializes in the technical realization, maintenance, and continued development of websites, web applications, and mobile apps, positioning itself as the technical execution partner for Dutch design and marketing-communication agencies. It has grown to a team of approximately 10 specialists and serves clients across sports events, healthcare, government, technology, certification, and real estate verticals, primarily in the Netherlands with selective international reach.

The firm's core product portfolio consists of five offerings — custom websites, web applications, iOS and Android apps (delivered via Progressive Web Apps), customer portals, and white-label WordPress plugins — supported by four service pillars: front-end development (pixel-perfect implementation, web animations, WCAG 2.1 accessibility), back-end development (API integrations with 40+ platforms, payment gateways, process automation), CMS development (WordPress, WooCommerce, Laravel/Statamic, Headless React), and ongoing Maintenance & Beheer partnerships. Notable delivered work includes the European Para Championships events platform handling 1.3M+ interactions across 139 countries, the Lean & Green CO2 certification platform serving 200+ companies across 8 countries, and websites for clients including Gemeente Rotterdam, Kalsbeek College, KLM Open, and NX Filtration.

Revenue is generated primarily through quote-based professional services engagements, supplemented by recurring maintenance subscriptions and one-time white-label WordPress plugin licenses. The go-to-market relies on direct partnerships with design and marketing-communication agencies (LAIK, Netvlies, StrakZat among visible partners), portfolio and case-study visibility, industry event presence (e.g., WordCamp Porto 2022), and direct client outreach. The company is founder-owned with no external funding disclosed; the December 2024 absorption of Jannes & Mannes activities represents its most significant inorganic move to date.

Name

Tabs & Spaces

Legal name

Tabs & Spaces

Website

https://tabs-spaces.nl

Company type

Private

Founded year

2018

Operating status

Operating

Headcount range

1–10 employees

Short description

Tabs & Spaces is a Rotterdam-based digital development bureau (~10 staff) building and maintaining custom websites, web applications, mobile apps, and customer portals for Dutch design agencies, government, healthcare, sports, and technology clients, with core expertise in WordPress, Laravel, and Statamic.

Ownership category

akta.pro rank

Headquarters

HQ city

Rotterdam

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Custom Website Development: Full-service custom website development including front-end, back-end, and CMS implementation. Projects range from small campaign sites to complex corporate websites.
2. Web Application Development: Custom web application development for streamlining internal and external business processes, replacing Excel-based workflows and manual processes.
3. iOS & Android App Development: Mobile app development using progressive web app technology for platform-independent deployment.
4. Maintenance & Support Packages: Ongoing website and application maintenance including regular updates, uptime monitoring, security monitoring, support, and license management. Continuous improvement and performance optimization services.
5. White Label WordPress Plugins: Development of custom WordPress plugins and add-ons, including white label solutions for agencies and their clients.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels5 records

Core offering

Tabs & Spaces is a digital development bureau in Rotterdam, Netherlands that builds, maintains, and further develops custom websites, web applications, iOS/Android apps, and customer portals. They primarily act as a technical execution partner for design and marketing-communication agencies, while also serving direct end-clients across sports events, healthcare, government, and technology sectors. Their work is anchored in WordPress, Laravel/Statamic, WooCommerce, headless React, and Progressive Web App technologies.

Product overview

Tabs & Spaces is a digital development bureau specializing in the technical realization, maintenance, and continued development of websites, web applications, and apps. The company operates as a development partner for design and marketing-communication agencies, providing the technical execution layer. Its core product portfolio consists of five main offerings: Custom Websites (Maatwerk Websites), Web Applications (Webapplicaties), iOS & Android Apps, Customer Portals (Klant Portalen & Mijn Omgevingen), and White Label WordPress Plugins. These core products are supported by four service pillars: Front-end Development (pixel-perfect implementation, web animations, WCAG accessibility), Back-end Development (API integrations, payment gateways, process automation), CMS Development (WordPress, Statamic/Laravel, WooCommerce), and Maintenance & Management (updates, monitoring, support). The company also offers a Research & Development service to explore emerging technologies including AI, IoT, and Blockchain. Projects span diverse sectors including sports events, healthcare, technology, and government.

Differentiator

Problem solved

Functional benefit

Products and services

• Maatwerk Websites (Custom Websites) Fully bespoke websites built on a CMS platform of the client's choice (primarily WordPress, Statamic/Laravel, or headless React), ranging from small campaign sites to complex corporate websites, designed without limitations based on the client's specific requirements.
• Webapplicaties (Web Applications) Custom web applications that streamline internal and external business processes by digitizing, standardizing, and centralizing workflows to increase efficiency and reduce errors and repetitive tasks.
• iOS & Android Apps Platform-independent mobile applications developed for both iOS and Android using a single codebase, offered as native-equivalent apps and Progressive Web Apps (PWA) to reduce development costs and time.
• (Klant) Portalen & Mijn Omgevingen (Customer Portals) Fully customized customer and partner portals providing 24/7 self-service access to invoices, transactions, usage data, and account management, with direct integrations to CRM, ERP, or accounting systems.
• (White Label) WordPress Plugins Custom WordPress plugins and add-ons built for the company's own use, client projects, and white-label distribution to agencies and their end clients.
• Front-end Development Service Front-end development services specializing in pixel-perfect implementation of design files, web animations (micro-animations, scroll animations, interactive animations), and WCAG 2.1 digital accessibility compliance.
• Back-end Development Service Back-end development services including API integrations with CRM, ERP, and ATS systems, payment gateway implementations (iDeal, credit card, others), and business process automation.
• CMS Development Service Content Management System development and implementation, with primary expertise in WordPress, plus Statamic (Laravel-based, API-driven), WooCommerce for e-commerce, and headless React architectures.
• Onderhoud & Beheer (Maintenance & Management) Ongoing maintenance and management services including regular software updates, uptime monitoring, security monitoring, support via phone and email, and included premium plugin licenses, with additional continuous improvement, performance optimization, and CMS training.
• Research & Development Research and development services exploring emerging technologies such as Artificial Intelligence (AI), Internet of Things (IoT), and Blockchain to stimulate innovation, improve performance, enhance security, and provide competitive advantage for client digital products.

Quantifiable outcome

• European Para Championships website served 1.3M+ interactions from 139 countries with 40 visitors per minute average
• +2 more outcomes

Named customers21 records

Segments6 records

Ideal customer profiles4 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration6 records

AI capability1 record

Feature8 records

Partnerships

Two partnerships are on record, tiered core and minor.

• LAIKcoreStrategic or Co-development Partner · 1 January 2023Strategic design partnership on the European Para Championships project. LAIK led the design and strategy phase while Tabs & Spaces provided technical execution. Collaboration resulted in a high-traffic event website serving 1.3M+ interactions.
• WordPress CommunityminorOthersActive participation in WordPress community including WordCamp Porto 2022 attendance. Demonstrates commitment to WordPress expertise and community engagement.

Scale indicators13 records

Recent moves8 records

Expansion highlights6 records

Direct peers

• Netvlies: Rotterdam/Eindhoven-based digital agency partnered with Tabs & Spaces (visible on their partner list). Directly comparable in service offering, region, and target mid-market Dutch clients.
• Van Ons: Dutch digital agency offering custom web development, apps, and cloud solutions. Comparable boutique-to-mid scale, similar technical delivery model, and overlapping customer base across NL enterprise and government.
• Strakzat: Dutch creative/design bureau listed as a partner on Tabs & Spaces' website. Comparable Dutch boutique creative/digital agency working on brand and digital projects for similar B2B clients.
• De Internet Jongens: Dutch web development shop specializing in custom WordPress and web applications. Comparable boutique scale, WordPress-first stack, and NL SME/mid-market positioning.
• LAIK: Dutch creative/digital agency explicitly named as a strategic design partner of Tabs & Spaces on the European Para Championships project. Comparable scope of full-service digital work in the same Dutch market.
• Level Level: Dutch WordPress-specialist agency focused on enterprise and government sites. Directly comparable to Tabs & Spaces on WordPress depth, accessibility focus, and Dutch public-sector client wins.
• Active Collective: Amsterdam-based digital agency delivering custom websites and web applications for B2B clients. Closely matches Tabs & Spaces in service mix (WordPress, custom web apps) and Dutch mid-market client focus, making it the most comparable direct peer.
• Crowded: Dutch digital agency delivering custom websites, platforms, and digital strategies. Closely comparable in size, scope, and Dutch B2B/government focus.

Broad incumbents

• Deloitte Digital: Global consultancy arm delivering large-scale digital transformation, web platforms, and engineering services. Adjacent incumbent competing for the same Dutch enterprise and government digital budgets but with vastly broader portfolio.
• Valtech: Global digital experience agency with Dutch roots, offering end-to-end strategy, design, and engineering at much larger scale. Comparable in service mix but operates as a broad incumbent rather than a boutique specialist.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• Xx.com/tabsspaces

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Tabs & Spaces