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Compare Selleo vs Concept21

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

Selleo Agency logo

Selleo

Web Development & Technology Website

Selleo is a software development company founded in 2005 with 100-249 employees. They have delivered over 150 projects for clients in Europe, the US, Canada, and Australia. Their expertise includes Ruby on Rails, ReactJS, React Native, EmberJS, and Elixir.

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Winner
Concept21 Agency logo

Concept21

Branding & Design Website

Concept21 is a full-spectrum digital agency based in Wroclaw, Poland, founded in 2015. The team of 50-99 employees has completed over 1,500 projects across web design, development, eCommerce, SEO, branding, and digital strategy.

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Feature Comparison

Attribute Selleo Concept21
Category Web Development & Technology Branding & Design
Rating
Winner +0.3 higher
Location Bielsko-Biala, Poland Wroclaw, Poland
Services
  • Staff Augmentation
  • Mobile App Development
  • Software Development
  • Web Design
  • UI/UX Design
  • Cloud Consulting
  • Software Testing
  • AI Development
  • DevOps Consulting
  • Web Development
  • SEO
  • eCommerce Development
  • CRO
  • Design Services
  • Digital Strategy
  • Branding
  • Staff Augmentation
  • Mobile App Development
  • Software Development
  • Web Design
  • UI/UX Design
  • Cloud Consulting
  • Software Testing
  • AI Development
  • DevOps Consulting
  • Web Development
  • SEO
  • eCommerce Development
  • CRO
  • Design Services
  • Digital Strategy
  • Branding
Industries
Real Estate Health Care Fintech HR Higher Education Finance Education Design Software & IT Services
Construction Consumer Goods Corporate Services Fintech Food and Beverage Hospitality Insurance Design Fashion eCommerce
Pros
  • Clients describe the team as a natural extension of their own, collaborative and invested.
  • Helped one client scale from $0.5m to $40m in revenue.
  • High standards and positive attitude toward employees and clients.
  • Google reviewers praise clear communication, responsiveness, and reliability.
  • Co-founders bring 15+ and 14+ years of experience in eCommerce, marketplace technology, Java, and financial systems.
  • Client list includes Allianz, Walmart, IKEA, Visa, Hilton, and Accor.
Cons
  • One client reported poor communication, repeated missed timelines, and poor quality, resulting in a $20k loss.
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