Progressive Web App Development .
iSkylar builds Progressive Web Apps that deliver a native-like experience on any device and browser — installable, offline-capable, and fast-loading — without the submission process, platform fees, or separate codebase of a native app. Whether you are adding PWA capability to an existing web product or building a new one, we implement the full service worker architecture, web app manifest, and caching strategy that separates a real PWA from a website with a manifest file.
What We Build
New PWA Builds
Full PWA development from scratch — React, Next.js, Angular, or Vue.js frontend with a complete service worker implementation, web app manifest, push notification system, and offline data sync strategy built in from the start.
PWA Conversion of Existing Web Apps
We upgrade your existing website or web application to a PWA — adding service workers, offline support, installability, and push notifications without disrupting your current codebase or user experience.
Offline-First Architecture
We design and implement caching strategies (cache-first, network-first, stale-while-revalidate) and background sync logic that keep your PWA functional when users have no connectivity — critical for field workers and emerging market audiences.
Push Notification Implementation
Web Push API implementation across browsers and platforms — subscription management, notification scheduling, personalisation, and analytics so you can measure and improve engagement without an app.
PWA Performance Optimisation
We audit your web app against Core Web Vitals and PWA Lighthouse scores — optimising bundle size, lazy loading, image compression, caching, and rendering strategy to hit the performance bar that makes a PWA feel native.
PWA + Backend Integration
Service worker background sync connected to your REST or GraphQL API, IndexedDB for local storage, conflict resolution strategy for offline-first writes, and a seamless online/offline state UX that users barely notice.
Delivered faster with AI tooling
We don't just write code; we orchestrate intelligence. By integrating Copilot-assisted generation and AI-driven automated testing, we reduce time-to-market by up to 40%.
LLM-backed development to eliminate boilerplate delays.
Anticipating edge cases before they enter production.
The iSkylar Tech Stack
Our Development Journey
A streamlined, transparent path from vision to launch.
Discovery & PWA Audit
1 week
If converting an existing app, we run a Lighthouse audit and service worker audit to baseline current scores and identify the highest-impact improvements. For new builds, we agree on offline scenarios, caching strategy, and notification scope.
Architecture & Design
1–3 weeks
Service worker strategy mapped, manifest configured, offline data model designed, push notification flow designed, and UI states for offline/online transitions prototyped and approved.
Development
3–10 weeks
Service worker implementation, background sync, push notifications, IndexedDB integration, and full responsive UI — with Lighthouse scores monitored throughout development, not just at the end.
QA & Cross-Browser Testing
1–2 weeks
Testing across Chrome, Safari (iOS and macOS), Firefox, and Edge — install flow, offline behaviour, push notification delivery, and background sync verified on real devices. Lighthouse score benchmarked against agreed targets.
Launch & Performance Validation
2–3 days
Production deployment, Lighthouse audit run on live environment, Core Web Vitals monitored via Search Console, and install prompt analytics verified.
Post-Launch Optimisation
Ongoing
Performance monitoring, service worker cache strategy tuning, push notification engagement optimisation, and feature additions as the product grows.
Our Proven Track Record
LIGHTHOUSE SCORE
97
Average Lighthouse PWA score achieved on applications built by iSkylar from scratch
PERFORMANCE GAIN
64%
Improvement in Time to Interactive after PWA conversion and service worker implementation for a retail web app
ENGAGEMENT UPLIFT
41%
Increase in return visit rate after implementing web push notifications for a content platform
DATA SAVINGS
72%
Reduction in data transfer costs for an offline-first field service PWA through aggressive caching strategy
Flexible Engagement
Partnership structures tailored to your scale and velocity.
PWA Audit & Upgrade
We run a Lighthouse audit on your existing web app, implement service workers, add installability, and configure offline support. Fast ROI on an existing web product.
- Defined Scope
- Fixed Budget
Full PWA Build
End-to-end PWA development — architecture, design, service worker implementation, push notifications, offline sync, QA across browsers, and post-launch performance validation. Our most popular engagement.
- Full Integration
- Infinite Scalability
PWA + Native App Bundle
PWA built alongside a React Native or Flutter app sharing the same backend and design system — giving you web, iOS, and Android coverage from one cohesive codebase strategy.
- Defined Scope
- Fixed Budget
"iSkylar transformed our legacy banking app into a modern, lightning-fast experience. Their AI-driven approach saved us months in engineering time."
James Donovan
CTO, GlobalFin
"The level of technical precision and UI craftsmanship is unmatched. They don't just build apps; they build business advantages."
Sarah Lin
Product Head, LuxeRetail
Frequently Asked Questions
What is a Progressive Web App and how is it different from a regular website?+
A PWA is a website that has been enhanced with service workers, a web app manifest, and offline capabilities to behave like a native app. Unlike a regular website, it can be installed on a home screen, work without a connection, send push notifications, and load instantly from cache. Unlike a native app, it has no App Store submission, no platform fee, and one codebase for all devices.
Does a PWA work on iOS as well as Android?+
Yes, with some differences. iOS Safari supports PWA installation, offline caching, and basic service worker functionality. Web push notifications on iOS require iOS 16.4+ with the app installed to the home screen. We design around these constraints and test on real iOS devices throughout development.
Can I convert my existing website to a PWA without rebuilding it?+
In most cases yes. Adding service workers, a web app manifest, and offline caching to an existing React, Angular, or Vue app is typically an incremental process rather than a rebuild. We start with a Lighthouse audit to identify what is already in place and what needs to be added.
How long does PWA development take?+
A PWA upgrade of an existing web app is typically 3–6 weeks. A full PWA built from scratch runs 6–14 weeks depending on offline complexity and feature scope.
What does PWA development cost?+
PWA audits and upgrades start from $4,000. Full builds from $15,000. Pricing depends on the complexity of offline scenarios, push notification requirements, and whether backend integration is in scope.
What Lighthouse score should a PWA achieve?+
A production PWA should score 90+ across Performance, Accessibility, Best Practices, and SEO on Lighthouse. The PWA category should be 100% compliant. We track these scores throughout development and benchmark the live environment at launch.
Do push notifications work without installing the PWA?+
On Android and desktop browsers, push notifications work from the browser without installation. On iOS, the user must add the PWA to their home screen from Safari before receiving push notifications (iOS 16.4+). We design the notification opt-in flow to accommodate this.
Who owns the code?+
You do. All source code, service worker configuration, manifest files, and deployment setup are fully transferred at project close.
Ready to build your breakthrough?
Contact us today for a technical consultation and a detailed project estimate.
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