Skip to content
Cobrain

Service 02 · App Development

Mobileappspeopleopeneveryday.

From idea to App Store and Google Play, we design and build native and cross-platform iOS and Android apps that are fast, intuitive and built to scale.

Get a free project planSee how we work
  • iOS & Android
  • React Native
  • Flutter
  • App Store launch

02The problem

Most apps get downloaded once — and deleted soon after.

Users give an app seconds to earn its place on their home screen. These are the problems that quietly sink most apps after launch.

Live site audit
0of 4 issues found
  • App ratings
  • User retention
  • Build cost
  • Store launch
  1. 01Pending scanCriticalDetected

    Crashes and bugs earn one-star reviews

    Rushed builds with thin testing crash on real devices — and every one-star review scares off the next thousand downloads.

  2. 02Pending scanCriticalDetected

    Clunky UX sends users back to the home screen

    Confusing onboarding, slow screens and too many taps mean users quit before they reach the value — and rarely return.

  3. 03Pending scanWarningDetected

    Two separate apps, double the cost

    Separate iOS and Android codebases double the time for every feature and fix — and the two versions drift out of sync.

  4. 04Pending scanWarningDetected

    Stuck in App Store review

    Missed guidelines, privacy details and store metadata get apps rejected — pushing launch dates back by weeks.

Illustrations

We build apps people keep.

Fast, stable, beautifully designed iOS and Android apps — built from one codebase and launched without the headaches.

See what we build

03What we build

Native, cross-platform or web app — the right build for your product.

The best technology depends on your audience, budget and roadmap. We’ve built with all of them, so we’ll recommend what actually fits — here’s how they compare:

Native (Swift & Kotlin)

The most polished experience on every device.

Separate apps built with Swift for iOS and Kotlin for Android — the best possible performance, animations and access to every device feature.

Best for

  • Performance-critical apps
  • Heavy use of camera, sensors or AR
  • Premium consumer products

What we deliver

  • iOS app in Swift & SwiftUI
  • Android app in Kotlin
  • App Store & Google Play launch
  • Analytics & crash reporting

Fit profile

Our take
Performance
5/5
Native feel
5/5
Time to market
2/5
Cost efficiency
1/5
Reach
4/5

Ideal for

  • Consumer brands
  • Health & fitness
  • Fintech
Discuss your Native (Swift & Kotlin) project
Compare all app approaches at a glance
Compare all app approaches at a glance (our take, 1–5)
CriteriaNative (Swift & Kotlin)React NativeFlutterProgressive Web App
Performance
Native feel
Time to market
Cost efficiency
Reach

04Built in by default

Everything a great app needs — built in, not bolted on.

Store approval, performance, security, analytics and accessibility aren’t extras on our quotes. They’re part of every app we ship — and every account stays in your name.

  • PerformanceIncluded

    Smooth, fast and stable

    We profile every release for launch time, frame rate and memory — and monitor crashes in production — so your app feels instant and your reviews stay positive.

  • App Store readyIncluded

    Approved on both stores

    We handle builds, store listings, screenshots, privacy labels and review guidelines — so launch day isn’t a rejection email.

  • Every deviceIncluded

    Looks right on every screen

    Layouts adapt to phones, foldables and tablets, in portrait and landscape, with light and dark mode.

  • AccessibilityIncluded

    Usable by everyone

    Dynamic type, VoiceOver and TalkBack labels and readable contrast — required by Apple and Google, and good for every user.

  • SecurityIncluded

    Secure by design

    Encrypted storage, secure sign-in with biometrics and checks against the OWASP Mobile Top 10.

  • AnalyticsIncluded

    Know how people use it

    Product analytics and crash reporting from day one — see where users drop off and which features drive retention.

  • OwnershipIncluded

    100% yours — no lock-in

    Your App Store and Google Play accounts, code, backend and designs are all in your name — we hand over everything, with documentation.

Also in every project

  • Push notifications
  • Crash reporting
  • Deep links
  • Offline support
  • Over-the-air updates
  • Post-launch support

05How we work

From idea to the App Store — every week mapped out.

Building an app is a big decision. You’ll always know which phase we’re in, what you’ll see next and what we need from you — from the first workshop to launch day.

  1. Phase 01 / 06Weeks 1–2

    Discovery & product scope

    We define your users, core features and success metrics, choose the right technology and turn it all into a prioritized feature list for version one.

    You’ll receive

    • Feature roadmap
    • Tech recommendation
    • User flows
    Your part
    A product workshop and access to any existing research.
    Milestone
    Scope approved
  2. Phase 02 / 06Weeks 2–4

    UX & UI design

    User flows become wireframes, then polished screens for iOS and Android with a clickable prototype you can test on your own phone.

    You’ll receive

    • Wireframes
    • UI designs
    • Clickable prototype
    Your part
    Test the prototype and give two rounds of feedback.
    Milestone
    Designs signed off
  3. Phase 03 / 06Weeks 4–11

    Development in sprints

    We build in two-week sprints — app, backend and integrations — and send you a new test build after every sprint.

    You’ll receive

    • Sprint test builds
    • Backend & APIs
    • Admin panel
    Your part
    Try each build and share feedback in the sprint review.
    Milestone
    Feature complete
  4. Phase 04 / 06Weeks 11–13

    Testing & beta

    Testing on real devices, performance and security checks, then a beta through TestFlight and Google Play so real users can try it first.

    You’ll receive

    • Device test report
    • Beta release
    • Bug fixes
    Your part
    Invite beta testers and gather their feedback.
    Milestone
    Beta approved
  5. Phase 05 / 06Week 13

    App Store & Google Play launch

    We prepare store listings, screenshots and privacy details, submit for review and handle any questions from Apple or Google.

    You’ll receive

    • Store listings
    • Store submission
    • Launch-day support
    Your part
    Approve the store listing copy and screenshots.
    Milestone
    Live on both stores
  6. Phase 06 / 06Week 14 onward

    Support & next releases

    We monitor crashes and reviews, fix issues fast and plan the next release based on real usage data.

    You’ll receive

    • Crash monitoring
    • Analytics review
    • Release roadmap
    Your part
    Share priorities for version two.
    Milestone
    Version 1 handed over

Typical timeline for a first version (MVP) on iOS and Android. Apps with complex features or many integrations take longer — you’ll get an exact plan after discovery.

06Ways to work together

Build your app the way that fits your stage.

Launching a first version, scaling a product or keeping a live app healthy each need a different setup. Pick the one that matches where you are today.

Which sounds like you?

  • Best match

    Fixed-price MVP

    A focused first version, at a fixed price.

    We scope the features that matter most, agree a fixed price and deliver your app to both stores in milestones — ideal for founders and new products.

    Pricing
    Fixed quote
    Payments
    By milestone
    Scope
    Version 1 features

    Best for

    • First-time app launches
    • Founders raising or validating
    • Projects with a set budget

    Includes

    • Discovery & feature scoping
    • Design, build & testing
    • App Store & Google Play launch
    Get an MVP quote
  • Best match

    Dedicated app team

    Developers, designer and QA — working as your team.

    A dedicated, cross-functional team that ships new features every sprint, directed by your roadmap and managed day to day by us.

    Pricing
    Monthly, per role
    Team
    Devs, design & QA
    Size
    Scale up or down

    Best for

    • Funded startups
    • Products with a long roadmap
    • Companies scaling a live app

    Includes

    • Mobile & backend developers
    • UI/UX designer & QA
    • Sprint planning & demos
    Build your app team
  • Best match

    App care plan

    Updates, fixes and improvements every month.

    OS and device updates, crash fixes, store compliance and small new features — so your app keeps working and keeps getting better.

    Pricing
    Monthly plan
    Commitment
    Flexible
    Support
    Priority

    Best for

    • Apps already in the stores
    • Teams without in-house developers
    • Apps that need regular updates

    Includes

    • iOS & Android OS updates
    • Crash monitoring & fixes
    • Monthly improvement hours
    Discuss a care plan
  • Free discovery call
  • Fixed quote after scoping
  • NDA on request
  • Store accounts in your name
  • You own the code

07FAQ

App development FAQs.

Straight answers to what founders and businesses ask most about building an app — cost, timelines, technology, launch and ownership.

12 answers

  • It depends on the features, number of screens, integrations and whether you need iOS, Android or both. A focused MVP costs far less than a full-featured platform. After a free discovery call we scope the first version with you and send an itemized, fixed quote — no surprises.

  • A typical first version (MVP) for iOS and Android takes around 14 weeks from discovery to launch, including design, development, testing and store approval. Apps with complex features or many integrations take longer. You’ll get a week-by-week plan after discovery.

  • In most cases, yes. An MVP launches the features your users need most, so you can learn from real usage before investing in everything else. It reduces risk, gets you to market faster and gives investors something real to see.

  • Native (Swift and Kotlin) gives the best performance and device access but costs more because you build two apps. React Native and Flutter let one codebase power both platforms with near-native performance — the best fit for most startups and businesses. We’ll recommend the right option for your app.

  • Most apps do. The backend stores data, handles accounts and payments and powers features like notifications, while an admin panel lets your team manage users and content. We build both as part of the project.

  • Yes. We can design key features to work without a connection and sync automatically when the user is back online — useful for field teams, travel and areas with poor signal.

  • Yes. We prepare store listings, screenshots and privacy details, submit the app for review and handle any questions from Apple or Google until it’s live.

  • We build to Apple’s and Google’s guidelines from day one, which avoids most rejections. If a reviewer raises an issue, we fix it and resubmit quickly as part of the launch.

  • Yes. We run a beta through TestFlight and Google Play testing so real users can try the app, and we fix issues before the public launch.

  • You do — 100%. The source code, design files and backend are yours, and the App Store and Google Play accounts are set up in your name.

  • We monitor crashes and reviews, fix issues fast and help plan the next release. You can then continue with a monthly care plan or a dedicated team to keep improving the app.

  • Yes. We’re happy to sign an NDA before you share your idea or any confidential details.

Still have a question?

Email admin@cobraintech.com or book a free call.

Book a free call

09Let’s talk

Ready to turn your app idea into a launch?

Tell us about your idea. On a free call we’ll help scope your first version, recommend the right technology and send you a fixed quote.

Prefer email?

admin@cobraintech.com