PreviewBrowser vs CK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PreviewBrowser
This application serves as a specialized tool for educators to review test items on iOS devices. It is designed for use with the Level12 delivery platform and is not intended for general public access.
- Test item review
- iOS device compatibility
- Level12 platform integration
- Educator-specific tool
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Note *** This app is not intended for general public use. The Preview Browser is a tool used by selected educators to review test items on iOS devices for the Level12 delivery platform.
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: PreviewBrowser at 5.0 against CK's 1.4. CK's advantage is ratings volume (18 vs 2) and device support (3 vs 1). On price, update cadence, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
PreviewBrowser holds the better App Store score, 5.0 against 1.4. That said, the two scores are not equally well evidenced: CK has 18 ratings behind it against 2, so its average is the more settled of the two.
PreviewBrowser ships an update every 7 months, CK every 9 months. The most recent releases landed on September 17, 2026 and July 18, 2026 respectively.
| Parameter | PreviewBrowser | CK |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (2 ratings) — better | 1.4 (18 ratings) |
| Positive reviews | — | 0.0% of reviews |
| Number of ratings | 2 | 18 — better |
| Update frequency | Every 7 months — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 | 14.0 |
| Further details — not scored | ||
| Size | 50 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | NWEA | ContentKeeper Technologies |
Customer experience
PreviewBrowser
CK
In-app purchases
PreviewBrowser
No in-app purchases
CK
No in-app purchases
