Digital Product Agency — Istanbul

We design digital products that convert.

Product Design  ·  Product Build  ·  Product Grow

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What we do

Three pillars. One team.

Brand, website and mobile app — designed, built and grown by one team, around one goal: products that convert and retain.

  • Design

    Brand identity, websites and mobile apps — designed as one system, from the logo to the last screen.

    • Brand Identity & Logo Design
    • Website Design
    • Mobile App Design
    • UI/UX Design & Prototyping
    • Design Systems
    Learn more

  • Build

    Your design, shipped — fast websites, React Native apps and SaaS products, production-ready on day one.

    • Website Development
    • React Native Mobile Apps
    • Web Apps & SaaS
    • Backend & Integrations
    • Performance & Accessibility Optimization
    Learn more

  • Grow

    The right people finding you — and converting once they do.

    • SEO
    • Generative Engine Optimization (GEO)
    • Conversion Rate Optimization (CRO)
    • App Store Optimization (ASO)
    • Paid Media Management
    Learn more

How we work

From brief to launch — fast.

No bloated sprints, no endless feedback loops. A focused process built for shipping.

  1. Discover

    Research, audit, competitor analysis.
    We define the real problem before anything is built.

  2. Design

    Wireframes, prototypes, visual design.
    Every screen mapped and validated before we write a line of code.

  3. Build

    Development & QA.
    Production-ready React or React Native — tested, accessible, fast.

  4. Grow

    Launch, optimize, iterate.
    SEO, GEO, CRO, ASO, and paid media to compound results after you ship.

Selected projects

Work that ships.

A sample of recent projects across industries and platforms.

View all work

About Custeo

Instant credibility.
More customers.
Higher conversion.

50+ successful projects delivered

Custeo is a brand, website and mobile app agency based in Istanbul, working with startups and product teams who need more than a good-looking interface — they need results. We handle every stage: brand identity and logo design, website and app design, web and React Native development, then keep it moving with SEO, GEO, CRO, and ASO after launch. We also ship our own app families, so every process we sell is one we use.

More about Custeo

Let's work together.

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