Mobile Web & PWA Testing
Ensure every mobile browser and progressive web app delivers flawlessly
What this service delivers
Mobile web experiences are where SEO traffic converts and where PWAs compete with native apps. We validate rendering fidelity, Core Web Vitals, offline behaviour, service worker logic, and back-button navigation across Chrome, Safari, Firefox, and Samsung Internet on real devices.
- Core Web Vitals (LCP, CLS, INP) measurement on real mobile hardware
- PWA installability, add-to-homescreen, and manifest validation
- Service worker offline cache and background sync testing
- Cross-browser rendering: Chrome, Safari WebKit, Samsung Internet, Firefox
- Web push notification, back-button Android, and input mask validation
Our approach
How we deliver mobile web & pwa testing
A structured, evidence-based methodology that produces findings your team can act on, not reports that sit in a folder.
Browser & device matrix definition
We cross-reference your analytics to identify the browser engine distribution of your actual mobile users, Chrome on Android, Safari WebKit on iOS, Samsung Internet on Galaxy devices, and construct a matrix that gives you honest coverage. We include both current and N-1 browser versions and the OS versions each engine ships with.
Core Web Vitals baseline on real devices
We capture LCP, CLS, and INP baselines on real phones connected to throttled 4G conditions using WebPageTest and Lighthouse CI. These field-accurate numbers are compared against your CrUX data to validate that lab results match production experience. Regressions are caught build-over-build before they affect SEO or conversion.
PWA capability and resilience validation
For progressive web apps, we validate service worker registration, cache strategy correctness, offline journey coverage (what the user sees vs. what they lose), background sync accuracy, push subscription flows, and the add-to-homescreen user experience across browsers that implement it differently.
Third-party script impact profiling
Analytics, chat, and ad tags routinely cause CLS and INP regressions on mobile. We profile each third-party's performance cost, identify lazy-load violations that shift layout after first paint, and provide prioritised optimisation recommendations with expected improvement projections.
What you receive
Every engagement delivers a defined set of artefacts. No ambiguity about what you're buying.
Discuss scope| Deliverable | Description |
|---|---|
Core Web Vitals report | LCP, CLS, and INP metrics per browser, device, and network condition with waterfall traces. |
PWA audit report | Installability checklist, service worker logic analysis, and offline journey coverage map. |
Cross-browser defect log | Rendering differences, layout breaks, and functionality gaps by browser engine and OS version. |
Third-party impact profile | Performance cost of each tag, CLS and INP contributions, and load-order recommendations. |
Optimisation roadmap | Prioritised list of improvements with expected CWV impact and implementation effort estimates. |
| Tool | Category |
|---|---|
| Playwright | Automation |
| Lighthouse CI | Performance |
| WebPageTest | Real device perf |
| axe DevTools | Accessibility |
| BrowserStack | Device cloud |
Tools & technologies
We use the tools your team already knows where possible, and introduce specialist tooling where it provides accuracy or coverage advantages you can't get otherwise.
Engagement phases
What the engagement looks like from brief to delivery, so your team can plan sprint integration points from day one.
Matrix setup
- Analytics review for browser/OS distribution
- Device and browser matrix definition
- Test environment configuration
Baseline measurement
- Core Web Vitals capture across device/network conditions
- CrUX field data comparison
- PWA capability audit
Functional & cross-browser testing
- Cross-browser rendering validation
- Service worker and offline testing
- Third-party script profiling
- Defect logging
Reporting
- CWV and functional report delivery
- Optimisation roadmap prioritisation
- Stakeholder review session
Mobile Web & PWA Testing, questions your team asks first
Mobile web testing validates that your website or progressive web app renders correctly and performs well across the full range of mobile browsers, devices, and network conditions, including offline scenarios for PWAs.
We run Lighthouse CI and WebPageTest on actual mobile hardware, not emulators, to capture real LCP, CLS, and INP values on throttled 4G and 5G connections, matching field data from Google's CrUX dataset.
We test service worker registration, offline cache strategies, background sync, push notification delivery, add-to-homescreen flow, web app manifest properties, and update lifecycle handling.
Yes. We profile the performance cost of analytics, ad, and chat scripts on mobile load time, flag CLS and INP regressions caused by late-loading third-party content, and provide optimisation recommendations.
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Learn moreDiscuss Mobile Web & PWA Testing for your app
Talk to a test architect about your stack, release cadence, and the specific failure modes you're trying to prevent. We'll scope an engagement that fits your sprint cycle.