Comparison

MERS eTextbook vs Catholic DSI

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

MERS eTextbook

This application allows students to download and access eTextbooks from their school. It provides interactive learning tools, multimedia content, and tracks user progress. Content is personalized based on user login and school affiliation.

Highlights
  • Downloadable eTextbooks
  • Personalized content by school
  • Interactive learning tools
  • Multimedia integration
  • Learning history tracking
  • Notifications for new content
Features
Read full description

"MERS eTextbook" (ONLY available for e-learning client schools) “MERS eTextbook” is an application which facilitates users to download eBooks published by Modern Education Research Society. The downloaded eTextbooks will be stored on the “My bookshelf” for easy access.   Features of MERS eTextbook: ‧ The eTextbook provides an extensive range of eTextbooks, including textbooks of various subjects and engaging storybooks. ‧ The application is able to identify users’ access right after they have logged in. It will then provide the suitable eTextbooks (including school-based textbooks) according to users’ school and level. ‧ Users will be notified to download new eTextbooks or update the downloaded ones whenever available.   Features of MERS eTextbooks: ‧ Each eTextbook is incorporated with practical tools, such as notebook, drawing tool, etc. ‧ eTextbooks are enriched with the integration of videos, audio materials, pictures, documents, spreadsheets and powerpoints, etc.      ‧ Interactive activities are included and users can track their learning history and results. ‧ Learning materials of various types are attached on specific page and position for easy access.

About

Catholic DSI

Features
Read full description

The Official App of the Catholic Education Office, the Catholic Diocese of Hong Kong, aims to provide information, news, event enrolment and surveys to kindergartens, government-aided primary schools and government-aided secondary schools sponsored by the Catholic Diocese of Hong Kong. 天主教香港教區教育事務處的手機應用程式。主要向教區屬下政府津貼中學、小學及幼稚園提供資訊、學校消息、活動報名及問卷調查。

Screenshots

Catholic DSI4 screens

Verdict

The call

The clearest difference is update cadence: MERS eTextbook at every 3 months against Catholic DSI's every 8 months. Catholic DSI's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 18.6). On price, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

MERS eTextbook ships an update every 3 months, Catholic DSI every 8 months. The most recent releases landed on August 28, 2026 and September 15, 2026 respectively.

Scorecard3 real differences · 5 level
MERS eTextbook versus Catholic DSI: the parameters behind the verdict, then further details
ParameterMERS eTextbookCatholic DSI
PriceFreeFree
Positive reviews16.7% of reviews—
Update frequencyEvery 3 months — betterEvery 8 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPadiPhone, iPad, iPod — better
Requires iOS18.611.0 — better
Further details — not scored
Size66 MB11 MB
Age rating4+4+
DeveloperModern Educational Research Society, LTDeClass Limited

In-app purchases

None

MERS eTextbook

No in-app purchases

None

Catholic DSI

No in-app purchases

Questions

Is MERS eTextbook free?
MERS eTextbook is free to download, with no in-app purchases.
Is Catholic DSI free?
Catholic DSI is free to download, with no in-app purchases.
Do MERS eTextbook or Catholic DSI have ads?
Neither MERS eTextbook nor Catholic DSI shows ads.
Which is updated more often, MERS eTextbook or Catholic DSI?
MERS eTextbook ships an update every 3 months, and Catholic DSI every 8 months. Most recently, MERS eTextbook was updated on August 28, 2026 and Catholic DSI on September 15, 2026.

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