maisyoleman@gmail.com+48794627691
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Native Android studio

Not cloud, but device – data stays on your phone

We design offline-first Android apps with Kotlin and Jetpack Compose. No trackers, no advertising ID, no hidden behavior after install.

Meet Flag & KeyContact the studio
  • Android-native
  • Offline-first
  • No advertising ID
12:30
Flag & Key
Works offlineZero trackersMaterial 3 UI

What we promise

Four non‑negotiable rules for every project.

0trackers in our apps
0advertising IDs used
100%of app data kept on the device
1platform we build for

Zero tracking by design

We never add analytics, ad SDKs or fingerprinting.

On‑device by default

All data is processed and stored locally on the phone.

Battery discipline

Background work is measured and kept within strict limits.

Accessible interfaces

Screens support TalkBack, large text and clear contrast.

  • Android-native
  • Kotlin
  • Jetpack Compose
  • Offline-first
  • Accessibility
  • Privacy by design

What we build

Full-cycle Android development, from concept to release, with the routine tasks handled correctly.

Native Android apps

Kotlin from day one. Apps run smoothly on typical Android hardware.

Interfaces in Jetpack Compose

Declarative UI using Material 3, responsive layouts and purposeful motion.

Offline-first data

Room and DataStore keep all data on the device, so the app works without a network.

Battery and performance

We profile start‑up, jank and background work, then monitor Android Vitals after each release.

Accessibility

TalkBack labels, high contrast and large‑text support are built in from the start.

Releases and long‑term care

Signed builds, staged rollouts on Google Play and ongoing updates as Android evolves.

Our app

Flag & Key

Flag & Key follows our core practice: native, fast to open and quiet about your data.

  • Operates without network
  • Stores data locally on the device
  • Requests only required permissions
  • No accounts, no ads, no analytics SDKs
  • Android
  • Offline-first
  • No advertising ID
  • Kotlin
Read the privacy policy
12:30
Flag & Key
12:30
Flag & Key
Streak7
This week
12:30
Flag & Key

How we build

Four steps from the first call to ongoing support. Each step yields a tangible artifact.

  1. Discovery

    Define the problem, target users and constraints up front.

  2. Architecture

    Sketch screens, data flow and permissions before writing production code.

  3. Build

    Implement with Kotlin, Compose and tests; deliver incremental builds for review.

  4. Release and care

    Stage rollout on Google Play, then monitor, fix and update for new Android releases.

UIComposeViewModelStateFlowRepositorysingle sourceStorageRoom · DataStore

One-way data flow: the interface observes state, and the repository owns the data.

Tools we trust

A concise toolbox that keeps the codebase maintainable.

Kotlin

Null‑safe Kotlin code that is easy to read.

Coroutines & Flow

Coroutines and Flow for clear asynchronous work.

Jetpack Compose

Compose for adaptable screens on phones and tablets.

Room

Room provides a typed local database for offline storage.

WorkManager

WorkManager runs reliable background jobs within battery limits.

Hilt

Hilt supplies testable dependency injection.

Gradle CI/CD

Gradle CI/CD runs repeatable builds and checks on every change.

Play Console

Play Console handles staged rollouts and release monitoring.

Questions, answered

Brief answers about our process.

What does keibuilm.com do?

We design, build and maintain native Android apps focused on offline use and privacy.

Which platforms do you support?

Android only. We specialize in a single platform.

What do you do with user data?

Data stays on the device. We run no analytics or ad SDKs and do not sell data.

How can I contact you?

Email maisyoleman@gmail.com or use the contact form on this page.

Do you support apps after release?

Yes. We deliver fixes, adapt to new Android versions and keep dependencies up to date.

Plain terms

What we do

What we never do

Build native Android apps in Kotlin
Sell or share personal data
Keep user data on the device
Add advertising IDs or tracking SDKs
Explain each permission clearly
Hide behavior behind vague policies
Provide support after release
Ship unrequested features

Studio details

keibuilm.com is an Android development studio. Meet the team behind the apps.

Start a conversation

Tell us about your project. Your email client opens with a prepared message.

maisyoleman@gmail.com

Privacy, in short

Our apps collect no personal data, use no advertising ID and include no third‑party trackers. Everything stays on your device. Read each app’s full policy below.

  • No personal data collected
  • No advertising ID
  • Delete the app, delete your data

Privacy policies