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← Back to selected workZEPHYR BROWSER / ANDROID CASE STUDY

A private browser,
routed by country.

A WebView-based Android browser with tabs, private mode, ad blocking and per-country proxy routing. Published on Google Play with 10K+ installs.

MY ROLE
Android development
CONTEXT
Galaksion · In-house studio
PRODUCT
Mobile browser
CORE STACK
Kotlin · AndroidX WebKit
Zephyr Browser start page and subscription screen on two phones
01 / PRODUCT & OWNERSHIP

A full browser
on top of WebView.

Zephyr Browser is a mobile browser built on Android WebView. Besides tabs, history, downloads and a private mode, it can block ads and send traffic through a proxy in a country the user picks. The start page adds browsing stats, local weather and news.

I developed the Android app and took it through Google Play publication. It has passed 10K+ installs.

The screens below are from the current Google Play build, captured on a Pixel 9 Pro XL.

02 / THE APPLICATION

Browse, pick a country,
go premium.

A loaded page, the proxy country list and the subscription screen. Open any capture to inspect it.

Zephyr Browser showing a web page with proxy and ad-block buttons in the toolbar
BrowsingA WebView page with proxy and ad-block controls in the toolbar.
List of proxy countries with minimum latency for each location
Proxy countriesEach location with its measured latency, one tap to switch.
Zephyr subscription screen with monthly and yearly plans in local currency
Subscription plansMonthly and yearly plans in local currency for ad blocking, more locations and extra privacy.
03 / ENGINEERING CONTRIBUTIONS

Routing, filtering,
and the web–native seam.

Most of the work sits below the interface: where the traffic goes, what gets loaded, and how pages talk to the app.

01 / NETWORK ROUTING

Route the WebView, not the device.

Per-country routing uses ProxyController from AndroidX WebKit, which applies a proxy to the app’s own WebViews. The browser needs no VPN service and no device-wide network access, and switching country does not touch other apps.

AndroidX WebKit · ProxyController

02 / AD BLOCKING

Filter with a maintained list.

Ad blocking is built on EasyList filter rules. A public, maintained list keeps up with ad networks far better than a hand-written set of domains would.

WebView · EasyList

03 / WEB AND NATIVE

Native features around the page.

Tabs, history, downloads and private mode are native features around the WebView. A JavaScript bridge connects page scripts with the app where the browser needs it.

Kotlin · WebView · JavaScript bridge

04 / RELEASE

Ship a browser to Google Play.

I took the app through Google Play review and publication, with subscriptions on Google Play Billing and local pricing. The browser has passed 10K+ installs.

Google Play · Google Play Billing

04 / WHAT THIS PROJECT DEMONSTRATES

Android work
below the UI layer.

Zephyr shows how I handle WebView internals: routing app traffic through a proxy, filtering requests, connecting web and native code, and getting a browser through Play review.

KotlinAndroid WebViewAndroidX WebKitGoogle Play Billing
LET’S TALK ANDROID

Have a product
to build↗

Evgenii Fedin · Android Engineer

More work ↗Résumé PDF ↓LinkedIn ↗