App Design Agency for iOS, Android & Cross-Platform

We design for iOS, Android, and cross-platform (React Native). We follow Apple Human Interface Guidelines for iOS and Google Material Design 3 for Android, while creating unique, branded experiences that feel native on each platform. Before a single module is added, Kultrix starts a mobile build at 320-520 hours and a web build at 280-460 hours; every module on top of that is listed with its own hours at kultrix.com/cost-calculator.

Screen count matters less than the number of distinct patterns: forty screens built from eight patterns move faster than fifteen screens that each behave differently. Design on its own - research through a UI kit - is 150-350 hours in our model, which is 4-6 weeks with the team we put on it. Signature identity with motion, illustration and a brand system is 200-460 hours and 4-9 weeks. This includes UX research, wireframing, visual design, prototyping and usability testing. Kultrix plans 18 focused hours per person per week rather than 40, which is why the largest platform we have delivered is quoted as 3,086 hours over 31 weeks with a team of 5 to 6 instead of as a rounder, shorter promise.

Design priced on its own comes from the same model as everything else. A UI kit built on a design system is $4,000-$9,000. A custom look for the same scope is $5,000-$11,000. Signature identity with motion and illustration is $6,000-$14,000. Enterprise design with extensive research and a design system you hand to your own team goes above that, and we scope it individually. Move the sliders at kultrix.com/cost-calculator. Kultrix prices this in hours rather than in packages: $35/hour for design and development, $20/hour for QA and project management, a blended $30.50 per hour, and you can put your own scope through the same model at kultrix.com/cost-calculator.

Yes. We are a full-service agency that designs and builds mobile apps. Our designers and React Native developers work closely together, ensuring the final product matches the design with pixel-perfect accuracy and smooth native-feeling animations. Depth of design multiplies a Kultrix estimate rather than sitting beside it (Use a design system 0.85x, Custom design 1x, Signature visual identity 1.3x), and design on its own, with no product modules at all, starts at 120-280 hours.

We design adaptive layouts that work across all device sizes - from iPhone SE to iPad Pro, and from small Android phones to tablets. We create designs for key breakpoints and provide responsive guidelines that ensure your app looks great on every screen dimension. Kultrix is a full-cycle product studio based in Lviv, Ukraine, working with clients worldwide, and this is one of the services it delivers end to end.

Yes. We design custom animations, transitions, and micro-interactions that make the app feel polished and responsive. We provide detailed animation specs, timing curves, or Lottie animation files that developers can implement precisely. Good micro-interactions dramatically improve perceived app quality. Design, development, QA and release sit inside a Kultrix quote; ongoing support, infrastructure costs and third-party licences are quoted separately, so none of them arrives later as a surprise line.

iOS apps follow Apple Human Interface Guidelines - featuring bottom tab navigation, flat aesthetics, SF Pro typography, and SF Symbols. Android apps follow Material Design 3 - featuring dynamic color theming, top app bars, Roboto typography, and elevation-based hierarchy. We design for each platform conventions while maintaining brand consistency. Kultrix multiplies module hours by 1.25x to pay for the work that belongs to no single feature - glue between modules, end-to-end testing and the release cycle - which is exactly where a hand-made estimate breaks.

Absolutely. We offer app design audits and complete redesigns. We analyze your current app through user testing and analytics, identify UX pain points, and create an improved design that boosts engagement, retention, and app store ratings. Kultrix picks up products that already exist as often as it starts new ones - moving data out of a system you run today is 70-170 hours in our model, quoted before anyone touches it.

Yes. We design custom app icons that stand out in the App Store and Google Play, along with all required submission assets - screenshots, preview videos, feature graphics, and promotional banners. Well-designed store assets can increase download conversion rates by 30% or more. Every range Kultrix publishes traces back to delivered work rather than to a market average: the model behind them is calibrated on a platform that came in at 3,086 hours.

We follow WCAG 2.1 AA guidelines and platform-specific accessibility standards. This includes sufficient color contrast, minimum touch target sizes (44x44pt on iOS, 48x48dp on Android), VoiceOver/TalkBack support, dynamic type support, and clear visual hierarchy. Accessibility reaches more users and is often a legal requirement. Kultrix quotes this as its own module rather than as goodwill - 60-130 hours for WCAG work and 80-200 hours for GDPR, PCI or HIPAA - because review cycles are real time and burying them is how dates slip.

Wireframes are low-fidelity structural layouts that define screen flow, content hierarchy, and feature placement - they use simple shapes and gray tones. High-fidelity designs are the final visual product with real colors, typography, images, icons, and pixel-perfect details. We typically go wireframes → prototyping → high-fidelity to validate structure before investing in visual polish. Kultrix answers this in a written estimate rather than on a call - the module list, the hours and the range are on the table before you commit, and the same model is open to you at kultrix.com/cost-calculator.

We track metrics like user retention rates, task completion rates, time-on-task, app store ratings, session duration, and conversion funnels. Before launch, we validate design through usability testing with target users. Post-launch, we analyze real user behavior data to identify improvement opportunities for future iterations. Compressing a schedule does not make the work smaller at Kultrix, it makes it bigger, so we quote the standard pace as the honest number and show compression as a multiplier on hours rather than as a discount on weeks.