MERS.HK vs protostar
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MERS.HK
This app provides students and teachers with an optimized experience for accessing and interacting with e-learning resources. Users can annotate screenshots, seamlessly connect with other educational tools, and enjoy a locked rotation for comfortable viewing.
- Optimized viewing and access to e-learning resources
- Screenshot annotation and sharing
- Seamless integration with other MERS apps
- Automatic rotation lock for comfortable use
- Designed for MERS e-Learning in Schools partners
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MERS.HK MERS.HK is aiming to give students and teachers the best possible user experience designed for optimal use of the e-learning resources developed by Modern Educational Research Society, Ltd (MERS). Features: ‧ Provides students and teachers with the best viewing and accessing results when they use MERS resources. ‧ Allows users to take a screenshot on which they can make notes, draw or write remarks. Screenshots can be uploaded to Camera Roll or Share to other Apps. ‧ e-Learning activities are seamlessly connected to other apps developed by MERS for effective learning. ‧ Rotation is automatically locked, in line with the content and interface design of the materials for best viewing. * Only available for e-Learning in Schools partners of MERS.
protostar
This educational app is designed for students aged 7-12, offering a platform for watching learning videos and playing interactive games. It is exclusively for users of the protostar education company and is available on iPad.
- Learning videos
- Educational games
- Preview content
- Review content
- Designed for ages 7-12
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1. Applicable to students aged 7-12 to use the app 2. This application is only for protostar education company 3. The application is only for ipad 4. The application is suitable for IPv6 5. This is an application that allows children to watch learning videos online, play learning games, and wait for preview and review
Verdict
The clearest difference is in-app purchases: MERS.HK at none against protostar's 1. MERS.HK also leads on ads (none vs shown). protostar's advantage is update cadence (every 3 weeks vs every 5 months). On price, device support and iOS requirement 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
Both are free to download. protostar sells 1 one-off in-app purchase. MERS.HK asks for nothing beyond the download.
MERS.HK ships an update every 5 months, protostar every 3 weeks. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | MERS.HK | protostar |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | 40.0% of reviews | — |
| Number of ratings | — | 1 — better |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPad | iPad |
| Requires iOS | 10.0 | 10 |
| Further details — not scored | ||
| Size | 2 MB | 155 MB |
| Age rating | 4+ | 4+ |
| Developer | Modern Educational Research Society, LTD | Longzhe Education Technology (Shanghai) Co., Ltd. |
Customer experience
MERS.HK
protostar
In-app purchases
MERS.HK
No in-app purchases
protostar
- Protostar English Course$299.99
