CellTrust SL2 vs Secure Contacts
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CellTrust SL2
This app provides a dedicated business number for your mobile device, separating personal and professional communications. It utilizes secure technologies for internal messaging and voice calls, ensuring compliance and eDiscovery readiness for enterprises.
- Assign dedicated Mobile Business Number (MBN)
- Separate personal and business communications
- SecureSMS® and SecureVoice™ technologies
- Secure internal communications
- eDiscovery and compliance support
- BYOD handset compatibility
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CellTrust SL2™ is an enterprise-level application that works by assigning a Mobile Business Number (MBN) to keep personal and business communications separate on a single, Bring Your Own Device (BYOD) handset, enabling communications without using the employee’s personal telephone number. Built on CellTrust’s SecureSMS® and SecureVoice™ technologies, this seamless solution also enables a secure connection for internal communications between SL2 users. This application is vital for enterprise communications that need to meet eDiscovery and compliance requirements. Any names or other personal data displayed are fictional and not based on real individuals. For use under patents: https://www.celltrust.com/SL2patents.
Secure Contacts
Manage business contacts centrally and compliantly without manual maintenance. Consolidate contacts from Outlook, Teams, and CRM systems in a secure environment, avoiding unwanted synchronization with third-party providers.
- GDPR-compliant contact storage
- Microsoft 365 integration
- Teams calls and chats
- Caller identification and blocking
- Duplicate detection and merging
- Secure contact sharing
- Vacation mode
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SECURE CONTACTS – GDPR-COMPLIANT CONTACT MANAGEMENT FOR BUSINESSES All your business contacts in one app - secure, efficient, and user-friendly. With Secure Contacts, you manage your business contacts centrally and in compliance with data protection regulations – completely without manual maintenance. The app consolidates contacts from Outlook, Microsoft Teams, your CRM system, and the company address book in a secure environment, without unwanted synchronization with third-party providers like Apple, Google, or WhatsApp. YOUR BENEFITS AT A GLANCE: • GDPR-compliant storage of all contacts • Secure use of Siri, CarPlay, etc. • No unwanted synchronization with third-party platforms • Microsoft integration: Seamless connection to M365 • Microsoft Teams: Start calls and chats directly from the app, including Teams status display • Caller identification • Call blocking • Vacation mode • vCard & QR code • Duplicate detection & automatic contact merging • Create, edit, delete, and securely share contacts • Scan vCards to quickly add new contacts • BYOD & COPE-ready: Ideal for both personal and business devices • Data privacy: No data collection by the app • No additional infrastructure required TRY IT FREE FOR 30 DAYS Request your FREE TRIAL LICENSE with full functionality directly from us and experience the benefits for your daily work. Request trial license: https://secure-contacts.com/kontakt-testlizenz/ TECHNICAL REQUIREMENTS • Microsoft Entra ID (formerly Azure AD) for user management • Any MDM system (Intune preferred) to manage mobile devices GET IN TOUCH Want to protect your business contacts without disrupting your employees’ workflow? Let’s talk about your project! More information available at: https://secure-contacts.com/ Please note: The app uses Apple iOS CallKit Blocking & Identification to recognize incoming callers. Users can also activate the app’s vacation mode, which automatically adds all listed contacts (except favorites) to the call block list. When vacation mode is deactivated, the block list is cleared.
Screenshots
Verdict
The clearest difference is rating: Secure Contacts at 5.0 against CellTrust SL2's 3.2. CellTrust SL2's advantage is ratings volume (27 vs 1) and iOS requirement (15.6 vs 17.0). 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.
Secure Contacts holds the better App Store score, 5.0 against 3.2. That said, the two scores are not equally well evidenced: CellTrust SL2 has 27 ratings behind it against 1, so its average is the more settled of the two.
CellTrust SL2 ships an update every 2 months, Secure Contacts every 6 weeks. The most recent releases landed on September 11, 2026 and July 26, 2026 respectively.
| Parameter | CellTrust SL2 | Secure Contacts |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (27 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 20.0% of reviews | — |
| Number of ratings | 27 — better | 1 |
| Update frequency | Every 2 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.6 — better | 17.0 |
| Further details — not scored | ||
| Size | 130 MB | 43 MB |
| Age rating | 4+ | 4+ |
| Developer | CellTrust Corporation | Provectus Software GmbH |
Customer experience
CellTrust SL2
Secure Contacts
In-app purchases
CellTrust SL2
No in-app purchases
Secure Contacts
No in-app purchases








