Comparison

Luna diary vs KnowMe (Simple Diary App)

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Luna diary

This app allows you to record your thoughts and emotions, linking them to moon phases. It offers a calming space for self-reflection, mood tracking, and building a journaling habit with customizable themes and visual progress tracking.

Highlights
  • Journal entries linked to moon phases
  • Customizable moon phases and emojis
  • Monthly challenges for premium themes
  • Ever-growing collection of diary themes
  • Visualize emotional growth with flowers and stars
  • Motivational Glass Cards for affirmations
  • Secure passcode lock and media attachments
Read full description

Record your thoughts and emotions alongside the phases of the moon, transforming each entry into a step toward greater self-awareness. Luna Diary is your personal sanctuary—calm, comforting, and beautifully reflective of your inner world. ■ Capture Your Day with Moon Phases • Express your emotions through customizable moon phases or charming emojis. • Ideal for gratitude journals, mood tracking, or daily reflections. • Turn stress, joy, or everyday moments into meaningful journal entries. ■ Monthly Challenges & Rewards • Write just 7 diary entries each month to unlock exclusive premium themes for free. • Build a sustainable journaling habit without pressure—every entry counts, and we're here to encourage you every step of the way. ■ Ever-Growing Theme Collection • Discover themes ranging from serene moonscapes and starry nights to delightful floral illustrations and cute cookie characters. • New designs are frequently added, keeping your diary fresh, personal, and inspiring. ■ Visualize Your Emotional Growth • With every entry, your emotional landscape blooms beautifully with flowers and stars. • Watch your monthly moon fill up as visual evidence of your emotional resilience and growth. ■ Empowerment with Glass Cards • Write motivational messages or affirmations on unique Glass Cards. • Use them regularly to watch their messages become clearer—reminders of your strength when you need them most. ■ Monthly Insights & Reflection • View personalized stats and insights reflecting your emotional journey over time. • Reflection insights are always free, helping you track patterns and appreciate your progress at a glance. ■ Essential Journaling Tools • Secure Lock: Protect your private thoughts with a passcode. • Media Attachments: Enhance entries with photos, videos, and music. • Moon Widget: A beautiful home-screen reminder to keep journaling. • Hashtag Organization: Easily tag and retrieve specific memories. • Inspiring Templates: Guided prompts help you overcome writer's block. Begin your journey of self-discovery today. Let the moon illuminate your story, one heartfelt entry at a time. Terms of Use https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy https://www.cachalot.kr/privacypolicy

About

KnowMe (Simple Diary App)

Features
Read full description

KnowMe: The warmest time to get to know yourself. Tangled worries lingering in your head, or earnest hopes for the future. If left only as thoughts, they quickly scatter and fade. Now, leave your thoughts as words in KnowMe. Passing thoughts will turn into radiant Mind Marbles, helping you face your true self. Created Mind Marbles can be stored or emptied into 3 special spaces depending on your state of mind: Emptying (Emotion Incinerator) "Burn negative emotions without a trace." Throw painful, jealous, depressing, or stressful emotions that suffocate you into the incinerator. (Not Saved) Marbles thrown here are completely incinerated and not saved in the app. Safely shake off the emotional garbage piled up in your heart and feel the true lightness of letting go. Filling (Future Mailbox) "The most reassuring parcel sent to your future self." Put your desired future, resolutions, and goals into a marble and drop it in the mailbox. (Saved) These marbles become letters and packages sent to your future self. Visualize the positive version of yourself that will arrive one day, and fill up on the driving force to live day by day. Gratitude & Pride (Tree of Growth) "Life's cheat code: Using positivity and gratitude as fertilizer." Hang your secret brags you couldn't tell others and the small moments of gratitude you found in daily life on the tree. (Saved) These marbles become special fertilizer that grows the Tree of Growth strong. Take them out anytime to fill up your self-esteem and see how wonderful you are and how full of thankful things your life is. Recommended for: Those who need a secret space (emotional trash can) to safely vent complex thoughts and stress. Those who want to visualize goals and resolutions for the future and gain motivation. Those who want to build a positive mindset and self-esteem through a gratitude journal. Those who want to look into their true heart and reflect through writing. A time to hold onto scattered thoughts and grow. Create your own marbles in KnowMe right now.

Screenshots

Luna diary4 screens
KnowMe (Simple Diary App)4 screens

Verdict

The call

The clearest difference is in-app purchases: KnowMe (Simple Diary App) at none against Luna diary's 3. KnowMe (Simple Diary App) also leads on ads (none vs shown) and iOS requirement (13.0 vs 16). Luna diary's advantage is update cadence (every 10 days vs every 4 weeks). On price and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Luna diary sells 3 in-app purchases, starting at $1.99 per month. KnowMe (Simple Diary App) asks for nothing beyond the download.

UpkeepUpdate frequency

Luna diary ships an update every 10 days, KnowMe (Simple Diary App) every 4 weeks. The most recent releases landed on October 20, 2026 and October 18, 2026 respectively.

Scorecard4 real differences · 6 level
Luna diary versus KnowMe (Simple Diary App): the parameters behind the verdict, then further details
ParameterLuna diaryKnowMe (Simple Diary App)
PriceFreeFree
Rating4.6 (95 ratings) — better—
Positive reviews64.5% of reviews—
Number of ratings95 — better—
Update frequencyEvery 10 days — betterEvery 4 weeks
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS1613.0 — better
Further details — not scored
Size107 MB65 MB
Age rating4+4+
DeveloperCachalotHojun Choi

In-app purchases

3 purchases

Luna diary

Subscriptions2
  • Monthly subscription$1.991 Month
  • Annual subscription7 Days trial$8.991 Year
One-time1
  • Premium$2.99
None

KnowMe (Simple Diary App)

No in-app purchases

Questions

Is Luna diary free?
Luna diary is free to download, with in-app purchases available.
Is KnowMe (Simple Diary App) free?
KnowMe (Simple Diary App) is free to download, with no in-app purchases.
Do Luna diary or KnowMe (Simple Diary App) have ads?
Luna diary shows ads; KnowMe (Simple Diary App) does not.
Which is updated more often, Luna diary or KnowMe (Simple Diary App)?
Luna diary ships an update every 10 days, and KnowMe (Simple Diary App) every 4 weeks. Most recently, Luna diary was updated on October 20, 2026 and KnowMe (Simple Diary App) on October 18, 2026.

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