FOSS eBooks vs CK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FOSS eBooks
Access and read your FOSS educational eBooks offline with this interactive reader. Enjoy features like portrait/landscape viewing, thumbnail navigation, and listen to audio narration on supported titles.
- Offline eBook access
- Portrait and landscape view
- Thumbnail navigation
- Audio narration on select products
- Interactive learning
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FOSS eBooks is an interactive eBook reader app for users of FOSS (Full Option Science System) educational products. With FOSS eBooks you can: ・Download your FOSS eBooks and access them offline, where and when you choose ・Select portrait or landscape view with thumbnail-based navigation ・Listen to audio of the text on select products
CK
This app offers a secure and filtered internet browsing experience for iOS users, ensuring CIPA compliance for educational institutions. It provides granular, identity-based reporting and policy-driven web access control, whether users are on-premises or traveling globally.
- Secure internet browsing
- Identity-based reporting
- Policy-based filtering
- CIPA compliance
- Global web access control
- MDM deployment
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The ContentKeeper CK-AUTH App provides users with a protected Internet browsing experience in conjunctions with the ContentKeeper Secure Internet Gateway (CK-SIG) system. The App provides for highly granular users-identity based reporting along with single sign-on support. User access to Internet resources are controlled by a sophisticated policy-based filtering engine. Features :- • Allows iOS users to have the same level of filtered and controlled web browsing access when either on-premises or travelling globally • Provides for policy-based high performance visibility of all web traffic and search engine activity • Ensures CIPA compliance for the education sector The system is easily deployed via a supported MDM system to the iOS endpoints. The system automatically detects when an iOS device is on-network or mobile and adjusts accordingly. The app does not involve the use of a Proxy server. Note: ContentKeeper Secure Web Gateway V190 or above and associated licence subscription is required.
Screenshots
Verdict
The clearest difference is rating: FOSS eBooks at 2.2 against CK's 1.4. FOSS eBooks also leads on review sentiment (40% vs 0%) and update cadence (every 2 months vs every 9 months). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.
FOSS eBooks holds the better App Store score, 2.2 against 1.4. Both are backed by a comparable volume of ratings — 57 and 19 respectively. Written reviews point the same way: 40% of FOSS eBooks's written reviews are positive against 0% of CK's.
FOSS eBooks ships an update every 2 months, CK every 9 months. Both last shipped on November 2, 2026.
| Parameter | FOSS eBooks | CK |
|---|---|---|
| Price | Free | Free |
| Rating | 2.2 (57 ratings) — better | 1.4 (19 ratings) |
| Positive reviews | 40.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 57 — better | 19 |
| Update frequency | Every 2 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 139 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Hurix Systems Pvt. Ltd. | ContentKeeper Technologies |
Customer experience
FOSS eBooks
CK
In-app purchases
FOSS eBooks
No in-app purchases
CK
No in-app purchases
