# Luna diary vs KnowMe (Simple Diary App)

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.

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.

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.

## The numbers

| Metric | Luna diary | KnowMe (Simple Diary App) |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (95 ratings)](https://appshunter.io/ios/app/luna-diary/id1536708339/reviews)** | — |
| Number of ratings | **95** | — |
| Positive reviews | 64.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 10 days** | Every 4 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 107 MB | 65 MB |
| Requires iOS | 16 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Cachalot](https://appshunter.io/developer/1536708341) | [Hojun Choi](https://appshunter.io/developer/1878642744) |

## What reviewers say

### Luna diary

[App page](https://appshunter.io/ios/app/luna-diary/id1536708339)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $1.99 | per month |
| Annual subscription | $8.99 | per year |
| Premium | $2.99 | one-time |


### KnowMe (Simple Diary App)

[App page](https://appshunter.io/ios/app/knowme-simple-diary-app/id6759447208)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*