Digital Product Agency — Istanbul
We design digital products that convert.
Product Design · Product Build · Product Grow
What we do
Three pillars. One team.
Design, build, and growth — aligned around one goal: products that convert and retain.
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Design
End-to-end product design — from the first wireframe to a visual identity and design system built to scale.
- UI/UX Design
- Mobile App Design
- Visual Identity
- Wireframing & Prototyping
- Design Systems
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Build
Your design, brought to life — fast, accessible, production-ready apps for web and mobile.
- Frontend Development
- React Native Mobile Apps
- Backend Development
- Design-to-Code Handoff
- Performance & Accessibility Optimization
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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
How we work
From brief to launch — fast.
No bloated sprints, no endless feedback loops. A focused process built for shipping.
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Discover
Research, audit, competitor analysis.
We define the real problem before anything is built. -
Design
Wireframes, prototypes, visual design.
Every screen mapped and validated before we write a line of code. -
Build
Development & QA.
Production-ready React or React Native — tested, accessible, fast. -
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.
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Lur8
A fresh identity for a learning experience design agency. Clean, modern, built to attract corporate clients.
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Hiperkitap
Complete brand system and mobile app design for a digital reading platform. From logo to app store screens.
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Takımsan
Website and search optimization for an industrial extruder manufacturer. Organic traffic and inbound leads rose sharply after launch.
About Custeo
Instant credibility.
More customers.
Higher conversion.
50+ successful projects delivered
Custeo is a digital product 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: branding and logo design, research-driven UI/UX, and frontend, backend, and mobile app development, then keep it moving with SEO, GEO, CRO, and ASO after launch.
More about Custeo