![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcodeloop-logo.png&w=3840&q=75) Custom mobile apps # Custom mobile app development for iOS and Android You need a custom mobile app that can pass App Store and Google Play review, survive the next OS release, and get used more than once. CodeLoop Studio designs and builds native and cross-platform apps for startups and companies that want a product team, not a pile of screenshots. Stack choice comes after we see the product — this page is how we engage, staff, and ship. [Get an estimate](https://www.codeloop.ba/online-estimate)[LipoDIETA](https://www.codeloop.ba/study-case/lipodiet) ![Hands holding a phone while reviewing a custom mobile app](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flandings%2Fcustom-mobile-app-development.jpg&w=3840&q=75) Photo by [Tracy Le Blanc](https://www.pexels.com/@tracy-le-blanc-119559) on [Pexels](https://www.pexels.com/photo/607812/) ## An app people install more than once A custom mobile app is the product your users keep: accounts, notifications, offline edges, payments if you take them, and a backend that does not collapse on launch week. [Custom mobile app development](https://www.codeloop.ba/custom-mobile-app-development) at CodeLoop Studio covers iOS and Android as one delivery — Swift and Kotlin when the OS experience must be perfect, Flutter or React Native when one squad should hit both stores without doubling cost. Store listing, privacy labels, signing, and review cycles sit in the plan, not as a surprise invoice. Typical clients are UK and EU teams. We work in English from Sarajevo, with CET overlap when the buyer is American. You keep product ownership. We own design-to-store quality and the awkward bits: certificates, review rejections, OS updates. You do not need a 40-page spec. You do need a decision-maker on the calls. A marketing homepage is [website development](https://www.codeloop.ba/website-development). New York product teams who want the same model with ET mornings start at [mobile app development for New York](https://www.codeloop.ba/mobile-app-development-new-york). A scoped estimate lands within **24 hours** via the [online estimate](https://www.codeloop.ba/online-estimate). ## Stores, devices, and a decision-maker — not a screenshot vendor A custom mobile app is accounts, notifications, offline edges, payments if you take them, and a backend that does not collapse on launch week. We cover iOS and Android as one delivery. Native when deep device APIs and platform-perfect chrome are the product. Flutter or React Native when one squad must hit both stores without doubling cost. Stack choice comes after we see the features — not because we only have one hammer. Store listing, privacy labels, signing, and review cycles sit in the plan, not as a surprise invoice. This work fits founders with a pitch and a budget, and product teams abroad who need a build partner rather than another contractor spreadsheet. Typical clients are UK and EU teams. We work in English from Sarajevo, with CET overlap when the buyer is American. You keep product ownership. We own design-to-store quality, real-device QA, and the awkward bits: certificates, review rejections, OS updates. You do not need a 40-page spec. You do need someone on the calls who can freeze scope. LipoDIETA is a health and nutrition product we shipped as a mobile app with the website and dashboard around it — recovery workflows, not a demo reel. That is the bar: something patients and staff can open next week, with store delivery included. Typical custom apps take **three to nine months** from idea to launch; a thin first version can ship faster when scope is honest. After release we can stay for OS updates and the next version. A marketing homepage is a different brief. New York overlap has its own page. ## What you are buying from a studio, not a screenshot vendor ![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcodeloop-logo.png&w=3840&q=75) Both stores, one plan iOS and Android as one delivery. Native when the OS is the product; Flutter or React Native when shared UI is honest. ![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcodeloop-logo.png&w=3840&q=75) Real-device QA Phones, not only simulators. Launch-week bugs are cheaper in staging than in a one-star review. ![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcodeloop-logo.png&w=3840&q=75) Backend that survives week one APIs, admin, notifications, payments. An empty shell that demos well is not an app. ![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcodeloop-logo.png&w=3840&q=75) Review is a phase Privacy nutrition labels, signing, screenshots. We plan them. We do not treat App Store review as a Friday. ![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcodeloop-logo.png&w=3840&q=75) Named owner, weekly demos Written status you can forward. A three-month silence until a big-bang upload is how apps miss the date. ![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcodeloop-logo.png&w=3840&q=75) Stay after launch OS updates and a backlog. We do not hand you a repo and vanish. ## From pitch to both stores 1. 01 ### Discovery that freezes an MVP What must ship, who uses it, which stores. Stack after features — not because we only have one hammer. 2. 02 ### Design for the slice Screens for the loop a user can finish. Not a redesign of email, onboarding, and six roles in v0. 3. 03 ### Vertical slices you can tap Build in pieces that work on a device. Typical custom apps take **3–9 months** from idea to launch; a thin first version can be faster when scope is honest. 4. 04 ### QA on phones Accounts, notifications, offline edges, payments if you take them. Simulators lie about thumbs and radios. 5. 05 ### Store submission Listings, privacy copy, signing, review notes. Then the next version if the slice works. ![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcodeloop-logo.png&w=3840&q=75) Case study LipoDIETA A health and nutrition product shipped as a mobile app with the website and dashboard around it — recovery workflows, not a demo reel. Patients and staff can open it next week. Store delivery included. [Open case →](https://www.codeloop.ba/study-case/lipodiet) ## What we need before we quote a date * The loop a user finishes One job, measurable. “Platform for wellness” is not a loop. * Who is on the calls A decision-maker. We cannot freeze scope with a committee that never replies. * Store orgs you control Apple and Google stay yours. We work inside them. Send the brief through the [estimate form](https://www.codeloop.ba/online-estimate). ## Facts a UK or EU buyer can cite | Fact | CodeLoop Studio | | ------------------ | ---------------------------------------------------------------------- | | Studio | Sarajevo, Bosnia and Herzegovina — for UK / EU teams, working remotely | | Founded | May 2025 | | Team | 2–9 people, one named owner per project | | Typical engagement | 3–9 months from kickoff to App Store / Google Play or production | | Estimate | written range within 24 hours of a brief | | Shipped product | RoomFit | ## Frequently asked Yes. CodeLoop Studio — for UK / EU teams, studio in Sarajevo — runs scope, UI/UX design, development and store submission as one delivery with one named owner. Typical engagements take 3–9 months; your Apple and Google accounts stay yours. Yes. The same team designs the screens (UI/UX) and builds the iOS and Android app, so the design you approve is the one that ships. A short brief: who the users are, the one thing they must be able to do, platforms, and any deadline. We send a written range within 24 hours. Yes. We start with a short discovery to freeze an MVP, then design and build. You do not need a 40-page spec. Yes. We overlap mornings Eastern Time for stand-ups and keep written updates async so you are not waiting overnight for every answer. Most of our custom mobile apps take three to nine months from idea to launch. A focused MVP can be faster; a multi-role product with payments and hardware takes longer. We give a timeline after discovery, not a marketing date on the first call. No. We recommend after we see features, device needs, and budget. Native when the OS experience must be perfect; Flutter or React Native when one team should ship both stores. The commercial engagement is the same: a studio that owns delivery, not a stack sermon. Related * [![LipoDIETA product preview](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flipodiet-live-preview.png&w=3840&q=75)LipoDIETA case studyA complete digital product suite for post-liposuction recovery: evidence-based dietary protocols, smart meal tracking, progress analytics, and professional guidance.](https://www.codeloop.ba/study-case/lipodiet) * [![Laptop showing code during a legacy software handover](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flandings%2Fcustom-software-development.jpg&w=3840&q=75)Legacy software takeoverWhen a freelancer leaves a half-finished Flutter or React Native app with messy code, you need a European partner that takes over existing or legacy apps, runs a code audit, and continues development — not a six-month rewrite sold as modernisation. CodeLoop Studio in Sarajevo joins Flutter, React Native, native, or Next.js repos when access and ownership are real. We will not invent a London or Berlin office to win the RFP.](https://www.codeloop.ba/legacy-software-takeover) * [![Mobile app development for UK / EU startups — studio in Sarajevo](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcijene-our-work.png&w=3840&q=75)App development for startupsNon-technical founders shortlisting a mobile app development company for startups usually need one partner from idea to App Store and Google Play — not a slide deck and a vanishing contractor. CodeLoop Studio in Sarajevo ships that path remotely for UK and EU teams: discovery, design for the first slice, build, store submission, then stay for v1.1 if usage proves the cut.](https://www.codeloop.ba/app-development-for-startups) * [![Designers collaborating on a website layout](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flandings%2Fwebsite-development.jpg&w=3840&q=75)Website developmentCodeLoop Studio does web development in Sarajevo: marketing sites, booking flows, and product pages that load on a phone and convert. We write in English and Bosnian. Buyers are mostly UK and EU product teams; the named team sits in Sarajevo (Dobrinja). This is the website brief — not an app-store binary, and not a logged-in dashboard.](https://www.codeloop.ba/website-development) * [![New York skyline — remote mobile app delivery for NYC teams](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flandings%2Fmobile-app-development-new-york.jpg&w=3840&q=75)New York teamsIf you searched for a studio to make a custom mobile app in New York, you do not need another vendor with a Manhattan coworking photo. You need a team that ships iOS and Android, speaks product English, and shows up on an ET morning call. CodeLoop Studio is based in Sarajevo and works with US companies remotely — including product teams in New York. No Fifth Avenue address. Overlap hours and store-ready delivery instead.](https://www.codeloop.ba/mobile-app-development-new-york) * [![Native iOS and Android App Development](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fblog-native-ios-android-cover.png&w=3840&q=75)Native iOS and Android (blog)When to invest in native iOS and Android development instead of cross-platform. We explain the benefits of native mobile apps for performance, UX, security, and access to device features.](https://www.codeloop.ba/blog/native-ios-android-app-development) * [![Smartphone ready for App Store and Google Play release](https://www.codeloop.ba/_next/image?url=%2Fblog%2Fshipping-app-store-from-sarajevo-cover.jpg&w=3840&q=75)App Store from Sarajevo (blog)How a Sarajevo team prepares iOS and Android listings, handles review, and ships to the App Store and Google Play for clients in Bosnia, the US, and the EU.](https://www.codeloop.ba/blog/shipping-app-store-from-sarajevo) * [![Developer working on a laptop](https://www.codeloop.ba/_next/image?url=%2Fblog%2Fandroid-compose-ui-cover.jpg&w=3840&q=75)Android Compose UI (blog)New Android work in this studio is Kotlin and Jetpack Compose. XML ViewBinding stays for inherited screens we are not rewriting for sport.](https://www.codeloop.ba/blog/android-compose-ui) * [![Person using an Android phone](https://www.codeloop.ba/_next/image?url=%2Fblog%2Fgoogle-in-app-updates-cover.jpg&w=3840&q=75)Play in-app updates (blog)In-app updates on Google Play are a release tool: flexible or immediate, inside your Console, after a build that already passes review.](https://www.codeloop.ba/blog/google-in-app-updates) * [![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flipodiet-live-preview.png&w=3840&q=75)LipoDIETA case studyA complete digital product suite for post-liposuction recovery: evidence-based dietary protocols, smart meal tracking, progress analytics, and professional guidance.](https://www.codeloop.ba/study-case/lipodiet) * [![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flandings%2Fcustom-software-development.jpg&w=3840&q=75)Legacy software takeoverWhen a freelancer leaves a half-finished Flutter or React Native app with messy code, you need a European partner that takes over existing or legacy apps, runs a code audit, and continues development — not a six-month rewrite sold as modernisation. CodeLoop Studio in Sarajevo joins Flutter, React Native, native, or Next.js repos when access and ownership are real. We will not invent a London or Berlin office to win the RFP.](https://www.codeloop.ba/legacy-software-takeover) * [![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fcijene-our-work.png&w=3840&q=75)App development for startupsNon-technical founders shortlisting a mobile app development company for startups usually need one partner from idea to App Store and Google Play — not a slide deck and a vanishing contractor. CodeLoop Studio in Sarajevo ships that path remotely for UK and EU teams: discovery, design for the first slice, build, store submission, then stay for v1.1 if usage proves the cut.](https://www.codeloop.ba/app-development-for-startups) * [![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flandings%2Fwebsite-development.jpg&w=3840&q=75)Website developmentCodeLoop Studio does web development in Sarajevo: marketing sites, booking flows, and product pages that load on a phone and convert. We write in English and Bosnian. Buyers are mostly UK and EU product teams; the named team sits in Sarajevo (Dobrinja). This is the website brief — not an app-store binary, and not a logged-in dashboard.](https://www.codeloop.ba/website-development) * [![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Flandings%2Fmobile-app-development-new-york.jpg&w=3840&q=75)New York teamsIf you searched for a studio to make a custom mobile app in New York, you do not need another vendor with a Manhattan coworking photo. You need a team that ships iOS and Android, speaks product English, and shows up on an ET morning call. CodeLoop Studio is based in Sarajevo and works with US companies remotely — including product teams in New York. No Fifth Avenue address. Overlap hours and store-ready delivery instead.](https://www.codeloop.ba/mobile-app-development-new-york) * [![](https://www.codeloop.ba/_next/image?url=%2Fimages%2Fblog-native-ios-android-cover.png&w=3840&q=75)Native iOS and Android (blog)When to invest in native iOS and Android development instead of cross-platform. We explain the benefits of native mobile apps for performance, UX, security, and access to device features.](https://www.codeloop.ba/blog/native-ios-android-app-development) * [![](https://www.codeloop.ba/_next/image?url=%2Fblog%2Fshipping-app-store-from-sarajevo-cover.jpg&w=3840&q=75)App Store from Sarajevo (blog)How a Sarajevo team prepares iOS and Android listings, handles review, and ships to the App Store and Google Play for clients in Bosnia, the US, and the EU.](https://www.codeloop.ba/blog/shipping-app-store-from-sarajevo) * [![](https://www.codeloop.ba/_next/image?url=%2Fblog%2Fandroid-compose-ui-cover.jpg&w=3840&q=75)Android Compose UI (blog)New Android work in this studio is Kotlin and Jetpack Compose. XML ViewBinding stays for inherited screens we are not rewriting for sport.](https://www.codeloop.ba/blog/android-compose-ui) * [![](https://www.codeloop.ba/_next/image?url=%2Fblog%2Fgoogle-in-app-updates-cover.jpg&w=3840&q=75)Play in-app updates (blog)In-app updates on Google Play are a release tool: flexible or immediate, inside your Console, after a build that already passes review.](https://www.codeloop.ba/blog/google-in-app-updates) [Get an estimate](https://www.codeloop.ba/online-estimate)