Mobile & Web App Studio, Istanbul
We design, build and grow apps.
Mobile and web apps for startups and growing businesses, from MVP to App Store growth. We also run our own app families, so your app gets a playbook we've already tested on ours.
What we do
Three pillars. One team.
One team takes your app from the first screen to the first thousand paying users.
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Design
UX, interface, brand and launch site, designed together as one system.
- Mobile App Design
- UI/UX Design & Prototyping
- Design Systems
- Brand Identity & Logo Design
- Website & Landing Page Design
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Build
React Native on iOS and Android, Next.js on the web. Ready for real users the day it ships.
- React Native Mobile Apps
- Web Apps & SaaS
- Backend & Integrations
- Websites & Landing Pages
- Performance & Accessibility Optimization
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Grow
We get your app in front of the right people in the stores, in search and in AI answers, then turn them into paying users.
- App Store Optimization (ASO)
- SEO
- Generative Engine Optimization (GEO)
- Conversion Rate Optimization (CRO)
- Paid Media Management
How we work
From idea to App Store, and after.
The same four steps from MVP to growth. We spend the time shipping, not in status meetings.
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Discover
Research, audit, competitor analysis.
We pin down the real problem and the smallest product that solves it. -
Design
Wireframes, prototypes, visual design.
We map and test every screen before anyone writes code. -
Build
Development & QA.
React Native and Next.js code that's tested, accessible and fast. -
Grow
Launch, optimize, iterate.
After launch, ASO, SEO, GEO, CRO and paid media grow your downloads and revenue.
Selected projects
Work that ships.
Our own app families and client apps. The same team designed, built and grew all of them.
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Tik8
A brand system and three mobile apps (shared grocery list, yearly goals, to-do), all from one design system and one codebase.
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ASOnest
Brand identity, SaaS product and marketing site for an App Store Optimization platform built for indie app developers.
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Fincend
A brand system and three live finance apps (money manager, expense tracker, no-spend challenge), plus the website and store listings.
About Custeo
Apps we build.
Apps we run.
One playbook.
50+ projects delivered
Custeo is a mobile and web app studio in Istanbul. We work with startups and growing businesses that need an app shipped and growing, and a nice interface alone won't get them there. We cover the whole job: app and UI/UX design, the brand and launch site around it, React Native and Next.js development, then ASO, SEO, GEO and CRO after launch. We also run our own app families, Tik8 and Fincend, so anything we sell you, we already use on our own apps.
More about CusteoHave an app in mind?
Idea, MVP or live product? Tell us where it stands. We reply within 24 hours.
Get in Touch