Secret Diary with Locks vs its rivals

Side-by-side comparison against Secret Diary with Locks's closest competitors — identity, store metrics, ratings & sentiment, and strategic intel.

Penzu
Peer
Core Identity
DeveloperHarshad JadavRelaxio s.r.o.Stoic app inc.Sumi InteractivePenzu Inc.Kodeon, Inc.LockMyPix Inc.
CategoryUtilitiesLifestyleHealth & FitnessLifestyleProductivityHealth & FitnessPhoto & Video
PlatformAndroid, iOSAndroid, iOSiOS, AndroidAndroid, iOSiOS, AndroidiOSiOS
Store Metrics
Rating0.0 / 54.8 / 54.8 / 54.6 / 54.2 / 54.6 / 54.7 / 5
Ratings Count059,27734,1509622,47281,7462,508
PriceFreeFreeFreeFreeFreeFreeFree
Release DateJun 5, 2023Jan 25, 2017Nov 15, 2017Jan 7, 2019Sep 14, 2011Jul 30, 2017Apr 10, 2020
Last UpdatedApr 13, 2026May 4, 2026Mar 10, 2026Jun 18, 2025Apr 14, 2026May 5, 2026Apr 9, 2026
Sentiment & Reviews
Sentimentexcellentpositive---mixed-
Score85/10078/100---45/100-
Praises
  • Secure password protection provides peace of mind for storing sensitive personal thoughts and private diary entries
  • Highly flexible mood and habit tracking tools allow for personalized mental health monitoring over long periods
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  • Daily mood tracking and journaling prompts provide consistent mental health support for long-term users
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Complaints
  • Frequent and intrusive advertisements disrupt the user experience during the note-taking and login process
  • Aggressive subscription prompts and paywalling of core features frustrate long-term users and new adopters
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  • Subscription and premium feature access failures post-purchase create significant distrust and financial frustration
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Requests
  • Biometric authentication support would improve the speed and convenience of accessing private journal entries
  • Expanded media support including video uploads and improved photo selection workflows for daily entries
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  • Voice-activated interaction capabilities would allow for more natural and hands-free journaling experiences
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Strategic Intel
Strengths
  • Offline-only architecture builds high user trust
  • AES 256-bit encryption creates high switching costs
  • One-tap entry mechanism reduces user friction, sustaining high DAU/MAU ratios.
  • Local-first data storage functions as a trust-based moat for sensitive mental health data.
  • Highly customizable tracking categories allow for personalized long-term progress documentation.
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  • Conversational AI persona creates a therapeutic best-friend experience
  • Aesthetic focus on emotional expression differentiates from clinical trackers
  • True AES CTR bank-grade encryption
  • Robust decoy/fake vault functionality
  • App masking (calculator disguise)
Weaknesses
  • Intrusive ad-inventory drives negative sentiment
  • Lack of biometric authentication limits convenience
  • Automatic backups locked behind subscription tier, causing 1★ churn.
  • Recent UI regressions in calendar view disrupt established user workflows.
  • Limited free-tier icon customization restricts personalization for non-paying users.
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  • Premium feature access failures post-purchase
  • Unresponsive customer support channels
  • Login regressions in the latest update
  • Low update velocity compared to market leader
  • Lack of WiFi transfer for large libraries
  • No 'Panic Switch' gesture for immediate hiding
Pricingsubscriptionfreemiumfreemiumfreemiumfreemiumsubscriptionsubscription
MomentumMaintenanceActiveActiveActiveIntenseMaintenanceMaintenance
Update Cadence5 versions, 1 majors/6mo, ~125d avg5 versions, 5 majors/6mo, ~10d avg5 versions5 versions5 versions2 versions, ~91d avg1 versions

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AI-powered analysis with editorial review, built from publicly available sources. Marlvel.ai is not affiliated with, endorsed by, or sponsored by Secret Diary with Locks, its developer, the app publisher, Apple, or Google Play. All trademarks, logos, and screenshots referenced remain the property of their respective owners.

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