# single line diary vs Secret Diary

The clearest difference is review sentiment: Secret Diary at 100% against single line diary's 45%. Secret Diary also leads on ads (none vs shown) and update cadence (monthly vs every 6 months). single line diary's advantage is price (Free vs $0.99) and iOS requirement (6.0 vs 15.6). On in-app purchases and device support there is nothing between them.

single line diary is free to download; Secret Diary costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

single line diary ships an update every 6 months, Secret Diary monthly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | single line diary | Secret Diary |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | 45.5% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | **Ad-supported** | Paid |
| Size | 4 MB | 8 MB |
| Requires iOS | **6.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 9+ |
| Developer | [SHIGETO TAKAGI](https://appshunter.io/developer/519611619) | [景 刘](https://appshunter.io/developer/1887860900) |

## What reviewers say

### single line diary

[App page](https://appshunter.io/ios/app/single-line-diary/id564585722)

A simple daily journal app that allows you to record entries from 62 days in the past up to tomorrow. It features a checkbox for each day and lets you customize the start of your week to Sunday or Monday.

**Highlights:** Daily single line entries, Checkbox for each day, Customizable week start (Sunday/Monday), Date range: 62 days prior to tomorrow

**In-app purchases:** none


### 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


## Frequently asked questions

### Is single line diary free?

single line diary is free to download, with no in-app purchases.

### Is Secret Diary free?

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

### Do single line diary or Secret Diary have ads?

single line diary shows ads; Secret Diary does not.

### Which is updated more often, single line diary or Secret Diary?

single line diary ships an update every 6 months, and Secret Diary monthly. Most recently, single line diary was updated on November 1, 2026 and Secret Diary on October 31, 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.*