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Compare Z4 vs Kelp

Side-by-side comparison of features, pricing, services, ratings and more.

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Z4

Z4

SEO & Organic Growth Website

Z4 is a Spanish digital agency combining advanced technology with marketing strategies. They specialize in technical SEO, web performance optimization, cybersecurity, and custom web development. With over 15 years of experience, they serve small to enterprise businesses across Spain.

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Kelp

Kelp

Cold Email Outreach Website

Kelp is a small, senior-led creative agency focused on building websites and digital systems that perform, scale, and remain maintainable long after launch. They partner with organizations that value clarity, technical precision, and long-term thinking.

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Feature Comparison

Attribute Z4 Kelp
Category SEO & Organic Growth Cold Email Outreach
Rating
Winner +0.1 higher
Location Madrid, Community of Madrid, Spain Brooksville, Florida
Services
  • AI Search Optimization
  • LLM optimization
  • SEO
  • SEO Consulting
  • Wordpress SEO
  • Web Development
  • Web Design
  • Website Maintenance
  • Wordpress Design
  • Branding
  • Brand Strategy
  • Online Reputation Management
  • Marketing Automation
  • Email Marketing
  • Local SEO
  • Mobile SEO
  • Shopify SEO
  • Technical SEO
  • Digital Design
  • Graphic Design
  • Logo Design
  • Product Design
  • UX Design
  • AI Search Optimization
  • LLM optimization
  • SEO
  • SEO Consulting
  • Wordpress SEO
  • Web Development
  • Web Design
  • Website Maintenance
  • Wordpress Design
  • Branding
  • Brand Strategy
  • Online Reputation Management
  • Marketing Automation
  • Email Marketing
  • Local SEO
  • Mobile SEO
  • Shopify SEO
  • Technical SEO
  • Digital Design
  • Graphic Design
  • Logo Design
  • Product Design
  • UX Design
Industries
Ecommerce Logistics Restaurants
Architecture B2B Services Ecommerce Media & Entertainment Real Estate
Pros
  • Offers a wide range of digital services from branding to AI, allowing clients to
  • Senior-led team with no junior layer ensures high-quality execution and accountability.
  • Strategy-first approach focusing on structure and user flow before visual design.
  • Specializes in WordPress and HubSpot CMS for scalable, marketer-friendly systems.
  • Deliberately small team allows tight communication and faster decision-making.
Cons
  • No public pricing information, making budget estimation difficult without consultation.
  • Small team size (1-9) may limit capacity for large-scale or simultaneous projects.
  • No mention of paid media or PPC services, which may be a gap for full-funnel marketing
Website Visit Site Visit Site

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Free Plan Available

You shouldn’t have to overpay for cold email tools. With Mystrika, you won’t.

It does cold email warmup, sequences, unified inbox, and AI writing - all in one place. Every other tool that does this charges somewhere between $100 and $500 a month. Mystrika has a free plan. 500 prospects. No expiry. No card.

The people who consistently book meetings from cold email aren’t smarter. They just stopped leaving money on the table.

See the Free Plan