MobileSaver Inc. — App Build Story

ℹ︎For confidentiality, company names, project names, and system images have been replaced with pseudonyms and mockups.

With points earned from watching ads, cut your monthly phone bill.

GigaSave is a mobile app that lets budget-SIM users earn points by watching ads and apply them to their monthly mobile bill. Data usage, data top-ups, and billing details are all handled in a single app.

“I want to cut fixed costs,” “earning points is a hassle,” “data and charges are hard to follow” — the story of launching an app built entirely in-house from scratch, from ad integration through bill application, to resolve these user frustrations.

See the build story Try the demo View overview

Total downloads

500K+

Bill application

Up to 100%

Earn points

Daily

Build period

8 months

Points balance

3,480 pt

≒ ¥3,480 worth

Data left this month 6.4GB / 10GB

Watch ads to earn points

Buy data

+1GB

Billing details

¥330

CLIENT

About the client

MobileSaver — delivering “a better deal on your phone bill.”

MobileSaver Inc. provides budget-SIM users an app that lets them “earn points from ads and apply them to their monthly mobile bill.” Users effectively lower their phone costs, while the operator sustains the service through ad revenue.

A user’s daily routine — watching ads, checking data, paying bills — is completed within a single mobile app.

500K+

Total downloads

100%

Max application rate

iOS/Android

Supported OS

BUSINESS FLOW

STEP 1

Watch ads

Video, sign-up, application, and survey ads

STEP 2

Earn points

Award points based on views and performance

STEP 3

Check data & charges

Manage remaining data and billing in the app

STEP 4

Apply to bill

Deduct the points amount from the monthly invoice

CHALLENGE

Design challenges to solve

Turning “earn” and “spend” into an experience users want to repeat every day.

Maximizing ad mediation revenue

Bundle multiple ad networks and deliver seamless high-value ads without interruption.

UX users want to keep using

Earning in spare moments with just a few taps calls for a stress-free flow.

Visualizing data and charges

Remaining data and billing details, at a glance, must be graspable.

Accurate linkage of points and billing

Ad results → points → bill credit — a system that links these accurately is required.

ARCHITECTURE

The architecture we built together

Four domains, built entirely in-house from scratch.

Together with MobileSaver, we integrated the ads, points, data, and billing domains into a single app.

EXECUTION

months

person-months

Domain ①

Ad integration

Challenge

Maximize revenue by bundling multiple ad networks

Solution

Ad mediation integration

Deliver video and performance-based ads seamlessly

Domain ②

Points management

Challenge

Accurately manage earnings, usage, and balance

Solution

A real-time points platform

Auto-award and history tracking based on ad performance

Domain ③

Data & top-up management

Challenge

Make remaining data and usage easy to understand

Solution

Data gauge + data top-up

Prevent overuse and top up when needed

Domain ④

Bill application

Challenge

Apply points to invoices accurately

Solution

Auto-use-all-points setting

Automatically deduct the points amount from the monthly invoice

Mobile

React Native

TypeScript

Redux Saga

Ads & analytics

AppLovin MAX

Google Ads

Firebase

Operations

CodePush

AWS S3OneSignal

IMPACT

The value the app creates

Everyday spare moments turn into savings on your phone bill.

Your phone bill effectively costs less

Apply saved points to cover up to your entire monthly invoice.

Keep it up in spare moments

A few-taps-to-earn flow turns it into a daily habit.

Data and charges at a glance

A data gauge and billing details help prevent overuse.

Sustainable through ad revenue

Ad mediation secures the funds for rewards.

STAKEHOLDER

User

SIM subscriber

Typically

Phone bills are fixed costs, hard to reduce

With GigaSave

Apply points earned from ads to your bill

Effectively save on your monthly phone bill

STAKEHOLDER

Advertiser

Ad buyer

Typically

Ads reach low-interest users

With GigaSave

Deliver to users who watch actively

Strong ad performance

STAKEHOLDER

Operator

SIM operator

Typically

Hard to differentiate in a price war

With GigaSave

Fund point rewards through ad revenue

Balancing retention and differentiation

With points earned from watching ads, cut your monthly phone bill.

MobileSaver — delivering “a better deal on your phone bill.”

Turning “earn” and “spend” into an experience users want to repeat every day.

Four domains, built entirely in-house from scratch.

Everyday spare moments turn into savings on your phone bill.

Experience a fully working app demo.