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Secret Diary - Diary with Lock vs its rivals

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

Secret Diary - Diary with Lock
This App
Unicorn Diary (with password)
Nemesis
YOUKAMI
Contender
Halo: Daily Journaling App
Contender
DayGram - One Line a Day Diary
Contender
MOODA
Contender
Question Diary
Peer
DrawMyToday - AI Picture Diary
Peer
Emoji Diary
Peer
Twig - Journal for Couples
Peer
Core Identity
DeveloperTrang Le ThiZipoAppsNOTEGG Corp.PerigeeEUIHYUNG JUNGAnalog Lab Corp.PIONECHANHO LEEKilian ObermeierTrent Guillory
CategoryLifestyleUtilitiesLifestyleLifestyleLifestyleLifestyleLifestyleLifestyleLifestyleLifestyle
PlatformiOSAndroid, iOSiOSiOSiOS, AndroidiOS, AndroidiOSiOSiOSiOS
Store Metrics
Rating4.7 / 54.4 / 54.8 / 54.8 / 54.5 / 54.6 / 54.4 / 54.3 / 54.7 / 54.6 / 5
Ratings Count90139771,109230528184617528
PriceFreeFreeFreeFreeFreeFreeFreeFreeFreeFree
Release DateDec 18, 2023Nov 16, 2020Feb 20, 2017May 20, 2021Jun 12, 2015Jul 10, 2023Jul 22, 2017Aug 16, 2023Jun 12, 2017Apr 6, 2019
Last UpdatedMar 29, 2024Dec 29, 2024Apr 19, 2024May 7, 2026May 5, 2026Feb 9, 2026Jan 19, 2026Jun 7, 2026Feb 4, 2021Feb 19, 2025
Sentiment & Reviews
Sentimentpositive---positive--terrible--
Score75/100---82/100--10/100--
Praises
  • Password protection features provide users with a sense of security for their private diary entries
  • Aesthetic design and visual customization options create an enjoyable experience for daily journaling habits
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  • Minimalist design and clean interface foster a calming experience for daily journaling habits
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Complaints
  • Inconsistent passcode entry behavior prevents users from accessing their personal diary entries reliably
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  • Inconsistent PDF export quality makes archived entries difficult to read or print
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  • Aggressive advertisement frequency prevents users from accessing the core daily journaling and illustration features
  • Lack of creative drawing tools forces reliance on automated illustration features for daily entries
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Requests
  • Autocorrect functionality during text entry would improve the accuracy of written diary content
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  • Expanded media support including color photos and multiple image attachments per entry
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Strategic Intel
Strengths
  • Local-only storage architecture functions as a privacy-first distribution moat for power users
  • Biometric authentication provides a standard, expected security baseline
  • Unicorn-themed comic collection functions as a unique engagement hook
  • Biometric security provides a baseline trust mechanism
  • High-frequency push notifications sustain daily habit formation
--
  • E-Ink aesthetic reduces cognitive load for daily writing
  • One-time purchase model builds long-term user trust
  • Privacy-first design via biometric and passcode locks
-
  • Annual reflection mechanism creates a unique emotional hook for long-term retention
  • Cloud-sync architecture enables multi-device access
  • Generative AI visual output provides a personalized creative record
--
Weaknesses
  • Inconsistent passcode entry behavior disrupts daily habit loops
  • Lack of autocorrect functionality reduces text-entry accuracy
  • Premium tier at $4.99/week sits above the category median
  • Lack of PDF export limits long-term memory preservation
  • 0.16 rating gap between iOS and Android platforms
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  • PDF export legibility issues reported by users
  • Limited font scaling hinders accessibility for power users
  • Application instability during export tasks
-
  • Manual daily input requirement creates high friction
  • Lack of monetization limits development resources
  • No AI-driven synthesis of historical entries
  • Aggressive ad frequency blocks core utility
  • Lack of manual drawing tools limits creative expression
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Pricingfreefreemiumfreemiumfreefreemiumfreefreefreefree-
MomentumZombieZombie--MaintenanceActiveZombieMaintenance--
Update Cadence1 versions, 1 majors/6mo2 versions, ~305d avg--2 versions, 1 majors/6mo, ~3d avg5 versions5 versions, ~383d avg1 versions--

Compare Secret Diary - Diary with Lock head-to-head

Disclosure: Independent intel to help mobile builders succeed.

AI-powered analysis with editorial review, built from publicly available sources. Marlvel.ai is not affiliated with, endorsed by, or sponsored by Secret Diary - Diary with Lock, 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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