OUR SERVICES
We build Progressive Web Apps that close the gap between web and native. Kultrix delivers installable, offline-capable PWAs with push notifications, background sync, and near-native performance, without the cost and friction of separate app store submissions.
Tell us what you are building - what exists today, what it has to do and when it has to be live. We come back with the questions we need answered and a scoped estimate instead of a range.
EXPERTISE
OUR APPROACH
Choose the cooperation format that best fits your business goals and development velocity.
Fast launch to test your idea and gather user feedback with minimal investment.
What's included
Timeline Typically 9-16 weeks
Complete cycle from initial strategy and design to final launch.
What's included
Timeline Typically 20-40 weeks
Scale your team with expert developers to accelerate development.
What's included
Timeline Flexible / Long-term
OUR PROCESS
We specialize in creating user-centered & innovative solutions. Delivering seamless digital experiences.
EXPERT INSIGHTS
A Progressive Web App reaches every platform through a single codebase while delivering near-native performance for most use cases.
One codebase, all platforms
Works on iOS, Android, and desktop from a single deployment.
No app store friction
Users install instantly from the browser - no review cycle.
Instant updates
Push a fix and every user gets it on next visit - no version lag.
SEO accessible
Web content is indexed by search engines unlike native apps.
Full hardware access
Camera, Bluetooth, NFC, and sensors with no browser limitations.
App store discoverability
Listed in App Store / Google Play for organic discovery.
Offline-first depth
Richer offline experiences with local SQLite and background sync.
Platform UI conventions
Feels native - follows system gestures and design language.
EXPERT GUIDANCE
Development Cost
One web team covers all platforms.
Distribution
Share a URL - no store submission or approval.
Hardware APIs
Camera, geo, push notifications - improving each year.
Update Delivery
Instant - service worker swaps cache on next load.
Offline Capability
Service worker cache - good for read-heavy scenarios.
Best For
Content, e-commerce, dashboards, and onboarding flows.
Development Cost
Separate iOS and Android teams or React Native.
Distribution
App Store / Play Store listing with review delay.
Hardware APIs
Full access: NFC, Bluetooth, ARKit, Health, etc.
Update Delivery
User must download update from store.
Offline Capability
Deep offline with local DB and background processing.
Best For
Games, AR/VR, health apps, and complex offline tools.
Feature
Progressive Web App
Native App
DELIVERABLES
Service Worker
Cache-first service worker with offline fallback pages and background sync.
App Manifest
Web app manifest with icons, theme colors, and display mode for install prompts.
Offline Mode
Offline data access via IndexedDB with optimistic UI and sync-on-reconnect.
Push Notifications
Web push notification integration with permission flow and notification management.
Install Flow
Custom beforeinstallprompt handler with contextual install prompts and analytics.
PWA Audit
Lighthouse PWA audit to 100 score - installable, reliable, and engaging criteria met.
INDUSTRIES
We build powerful digital experiences across various sectors, ensuring your product meets unique market demands.
Data-driven commerce solutions that improve journeys, boost sales, and optimize operations.
Data-driven commerce solutions that improve journeys, increase sales, and optimize operations.
Reliable medical platforms that protect patient data, simplify workflows, and support clinical accuracy.
Product-driven platforms that enhance workflows, automate processes, and scale with your business.
CASE STUDIES
START YOUR PROJECT
Expert developers ready to deliver high-quality digital products.
INSIGHTS
Thirteen Ukrainian app development companies, each named with a link to its own site and described only from what that site claims. Alphabetical, no scores, no prices. Kultrix is one of the thirteen.
2026-08-26
What an app costs and how long it takes, in hours: a mobile base is 320-520 hours, all fifteen modules from 40-90 to 150-340 hours, and a plan built on 18 focused hours a week.
2026-08-24
How to choose a software development agency: what to ask, what to ask them to show, and how to compare two proposals by stripping the rates out and reading the hours.
2026-08-24
FAQ
A PWA is a web application that uses modern browser APIs to deliver app-like experiences - installable on the home screen, works offline, receives push notifications, and loads instantly. PWAs are built with standard web technologies but behave like native apps on supported devices.
PWAs are the right choice when you want cross-platform reach (iOS, Android, desktop) from a single codebase, lower development and maintenance costs, no app store approval friction, and direct URL sharing. Native apps are better for deep OS integration, AR/VR, or when app store discoverability is critical.
Yes, with limitations. Safari on iOS supports service workers, offline caching, and home screen installation. Push notifications via the Push API are supported on iOS 16.4+. Background sync has limited iOS support. Kultrix designs PWAs to degrade gracefully on iOS while delivering the full experience on Android and desktop.
We use a service worker with a cache-first strategy for static assets and a network-first strategy for dynamic API data. For offline data access, we sync data to IndexedDB on initial load and use background sync to replay failed mutations when connectivity resumes.
Web push uses the Push API and service workers. After the user grants permission, your server can send push messages via the Web Push Protocol even when the browser is closed. We set up a push server (using web-push library), store subscriptions securely, and send targeted notifications.
PWAs can match native app perceived performance through app shell caching (instant loading), skeleton screens, optimistic UI updates, and preloading the next likely screen. With a service worker, repeat visits load from cache before the network - often faster than a native app launch.
Yes. Adding PWA capabilities to an existing site typically requires: a valid Web App Manifest, a registered service worker with caching strategy, HTTPS, and responsive design. Kultrix audits your current site and implements these incrementally without a full rebuild.
A service worker is a JavaScript file that runs in the background, separate from your web page. It intercepts network requests, enabling offline caching and background sync. It is also the mechanism behind push notifications. Service workers only run on HTTPS domains.
We implement a service worker update flow that detects new versions, prompts users to refresh, and activates the new service worker immediately on confirmation. This prevents users from staying on stale cached versions while ensuring updates are not disruptive.
Yes - PWAs are indexed by search engines like any website. Because they are server-rendered or statically generated (not SPA-only), Google's crawler sees real HTML content. This makes PWAs a superior choice to native apps for SEO-driven acquisition strategies.
We run Lighthouse PWA audits targeting 100/100 on the installability and reliability criteria, measure Time to Interactive and Largest Contentful Paint with real user monitoring, and track install prompt acceptance rate and push notification opt-in rates as engagement KPIs.
A PWA conversion of an existing web app is scoped as a fixed piece of work once we see the codebase: service worker, caching strategy, install flow and an offline story. Building a new PWA from scratch takes 8-14 weeks, depending on how much has to work offline - offline mode and sync alone is 80-160 hours in our model. You get a Lighthouse-audited build with the service worker patterns documented.
