| Core Identity |
| Developer | DoMobile Co., Ltd. | Legendary Software Labs LLC | NQ Mobile Inc. | KeepSafe Software, Inc | 可可 蔡 | Nitrome | 友财 徐 |
| Category | Utilities | Photo & Video | Productivity | Photo & Video | Utilities | Games | Utilities |
| Platform | Android, iOS | iOS, Android | iOS | iOS | iOS, Android | iOS, Android | iOS |
| Store Metrics |
| Rating | 3.6 / 5 | 4.8 / 5 | 4.2 / 5 | 4.7 / 5 | 4.6 / 5 | 4.5 / 5 | 4.6 / 5 |
| Ratings Count | 393 | 1,003,134 | 8,552 | 374,617 | 73 | 76 | 6,310 |
| Price | Free | Free | Free | Free | Free | Free | Free |
| Release Date | May 15, 2020 | Feb 8, 2011 | Jul 17, 2012 | Apr 6, 2012 | Oct 3, 2011 | Jul 22, 2015 | Nov 7, 2023 |
| Last Updated | Jan 21, 2026 | Apr 30, 2026 | Feb 24, 2026 | May 18, 2026 | Apr 24, 2025 | Mar 27, 2024 | Apr 27, 2026 |
| Sentiment & Reviews |
| Sentiment | mixed | positive | - | - | - | mixed | - |
| Score | 45/100 | 75/100 | - | - | - | 55/100 | - |
| Praises | - Core app locking functionality provides effective security for private photos and sensitive mobile applications
- Simple interface design allows users to quickly secure their private content without complex setup
| - Secure photo and document storage provides users with reliable privacy for sensitive personal files
| - | - | - | - Addictive core gameplay loop provides a satisfying challenge for short play sessions
- Retro visual aesthetic and character variety create a charming and memorable experience
| - |
| Complaints | - Data recovery failure after reinstallation or device migration causes permanent loss of private media
- Excessive advertisement frequency disrupts the user experience and makes the application difficult to navigate
| - Critical data loss or inaccessible files reported following recent updates on mobile devices
| - | - | - | - Aggressive advertisement frequency interrupts gameplay flow and causes frustration during high-score attempts
- Technical instability and physics glitches cause unfair losses during critical moments of play
| - |
| Requests | - Cloud synchronization or backup support is requested to prevent permanent loss of sensitive user data
| - Integrated duplicate photo detection would help users manage storage space more effectively
| - | - | - | - Expanded content including new maps and daily challenges to maintain long-term interest
| - |
| Strategic Intel |
| Strengths | - Device Administrator permission-based protection creates high switching costs
- 45-language library functions as a B2B distribution barrier
| - Biometric and PIN-based security layers sustain high user trust
- Face Down Lock increases perceived utility in high-privacy scenarios
| - Technical 'Space Encryption' value proposition
- Established market presence since 2012
- Strong rating (4.24) from 8,500+ users
| - Military-grade encryption marketing establishes a high trust barrier
- Long-standing brand heritage sustains organic install velocity
- Multi-platform sync capability ensures user retention
| - | - Retro visual aesthetic sustains brand identity
- Single-touch physics loop drives high session frequency
- Game Center integration provides social retention
| - |
| Weaknesses | - Permanent data loss on migration reported in reviews
- Excessive ad frequency drives uninstalls
- 0.6-star rating gap between Android and iOS
| - Critical data loss reports post-update erode long-term retention
- No self-service password reset mechanism creates permanent lockout risk
| - Overt 'Vault' branding lacks stealth/deniability
- Stagnant update history (bug fixes only)
- Lower release velocity than top-tier contenders
| - Premium tier features are increasingly standard in OS-native tools
- Lack of high-frequency feature updates compared to market leaders
- Cross-platform parity issues indicated by platform rating gaps
| - | - Aggressive ad-placement triggers high churn
- Technical physics glitches cause unfair losses
- Lack of content depth limits long-term engagement
| - |
| Pricing | freemium | freemium | subscription | subscription | free | freemium | free |
| Momentum | Maintenance | Active | Maintenance | Maintenance | Intense | Steady | Intense |
| Update Cadence | 5 versions, ~111d avg | 5 versions, ~6d avg | 1 versions | 5 versions, ~25d avg | 5 versions | 5 versions | 5 versions |
