# Secret Diary vs Lumi

The clearest difference is price: Lumi at Free against Secret Diary's $0.99. Lumi also leads on update cadence (weekly vs monthly). Secret Diary's advantage is in-app purchases (none vs 2) and iOS requirement (15.6 vs 17.0). On ads and device support there is nothing between them.

Lumi is free to download; Secret Diary costs $0.99 up front. Lumi sells 2 in-app purchases, starting at $9.99 per year. Secret Diary asks for nothing beyond the download.

Secret Diary ships an update monthly, Lumi weekly. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Secret Diary | Lumi |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | Paid | — |
| Size | 8 MB | 91 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [景 刘](https://appshunter.io/developer/1887860900) | [小拓 林](https://appshunter.io/developer/1267985198) |

## What reviewers say

### Secret Diary

[App page](https://appshunter.io/ios/app/secret-diary-notebook/id6761122036)

A secure, offline digital journal that prioritizes your privacy. Store thoughts locally with robust encryption and multimedia support. Export entries as PDFs for complete data ownership.

**Highlights:** True offline functionality, Local encryption with Face ID/Touch ID, Multimedia entries with multiple images, Calendar heatmap for recording frequency, Gentle, customizable writing reminders, One-click encrypted PDF export

**In-app purchases:** none


### Lumi

[App page](https://appshunter.io/ios/app/lumi/id6774024973)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| lumi-年会员 | $9.99 | per year |
| lumi-永久会员 | $29.99 | one-time |


## Frequently asked questions

### Is Secret Diary free?

Secret Diary costs $0.99, with no in-app purchases.

### Is Lumi free?

Lumi is free to download, with in-app purchases available.

### Do Secret Diary or Lumi have ads?

Neither Secret Diary nor Lumi shows ads.

### Which is updated more often, Secret Diary or Lumi?

Secret Diary ships an update monthly, and Lumi weekly. Most recently, Secret Diary was updated on October 24, 2026 and Lumi on October 28, 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.*