# 3sec Diary vs UDWriterPro

The clearest difference is review sentiment: UDWriterPro at 100% against 3sec Diary's 60%. UDWriterPro also leads on in-app purchases (none vs 1) and ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. 3sec Diary sells 1 one-off in-app purchase. UDWriterPro asks for nothing beyond the download.

3sec Diary ships an update every 26 months, UDWriterPro every 2 weeks. The most recent releases landed on July 4, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | 3sec Diary | UDWriterPro |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 26 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 17 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KENJI KANEMOTO](https://appshunter.io/developer/402720982) | [Shamrock Records, Inc.](https://appshunter.io/developer/443431466) |

## What reviewers say

### 3sec Diary

[App page](https://appshunter.io/ios/app/3sec-diary/id985967203)

Quickly log daily activities and feelings in just three seconds. Your entries are securely stored in your iPhone Calendar, ensuring data safety and easy access. This tool helps you preserve memories and makes research and sharing effortless.

**Highlights:** 3-second daily logging, Calendar integration, Secure data storage, Easy research and sharing, Memory preservation

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Eliminate Ads | $0.99 | one-time |


### UDWriterPro

[App page](https://appshunter.io/ios/app/udwriterpro/id1258223639)

This app enables handwritten communication, offering an innovative approach to digital notes and messages. Designed primarily for iPad, it also functions on iPhone, bridging the gap between traditional writing and modern technology.

**Highlights:** Handwritten communication, Hybrid communication tool, Designed for iPad, iPhone compatibility, Innovative handwriting

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

**In-app purchases:** none


## Frequently asked questions

### Is 3sec Diary free?

3sec Diary is free to download, with in-app purchases available.

### Is UDWriterPro free?

UDWriterPro is free to download, with no in-app purchases.

### Do 3sec Diary or UDWriterPro have ads?

3sec Diary shows ads; UDWriterPro does not.

### Which is updated more often, 3sec Diary or UDWriterPro?

3sec Diary ships an update every 26 months, and UDWriterPro every 2 weeks. Most recently, 3sec Diary was updated on July 4, 2026 and UDWriterPro on September 14, 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.*