# Date and time calc vs ThreeLinesDiary

The clearest difference is review sentiment: ThreeLinesDiary at 75% against Date and time calc's 23%. ThreeLinesDiary also leads on update cadence (every 6 months vs every 16 months) and iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Date and time calc ships an update every 16 months, ThreeLinesDiary every 6 months. The most recent releases landed on July 23, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Date and time calc | ThreeLinesDiary |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 23.1% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 16 months | **Every 6 months** |
| Monetization | Ad-supported | Ad-supported |
| Size | 6 MB | 7 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Osamu Ishigami](https://appshunter.io/developer/901265058) | [Seiji Nagano](https://appshunter.io/developer/689628441) |

## What reviewers say

### Date and time calc

[App page](https://appshunter.io/ios/app/date-and-time-calc/id949261920)

Easily calculate the difference between dates or add/subtract time intervals. This utility app simplifies date and time arithmetic with straightforward operations.

**Highlights:** Date difference calculation, Date addition and subtraction, Time difference calculation, Time addition and subtraction

**Features:** macOS Compatibility

**In-app purchases:** none


### ThreeLinesDiary

[App page](https://appshunter.io/ios/app/threelinesdiary/id1161808671)

A simple journaling app designed to improve sleep quality by encouraging users to write a three-line diary entry before bed. It allows for photo attachments and provides daily reminders to help build a consistent writing habit.

**Highlights:** Three-line daily journal entries, Attach photos to entries, Daily writing reminders, Improve sleep quality, Simple and intuitive interface

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Date and time calc free?

Date and time calc is free to download, with no in-app purchases.

### Is ThreeLinesDiary free?

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

### Do Date and time calc or ThreeLinesDiary have ads?

Both Date and time calc and ThreeLinesDiary show ads.

### Which is updated more often, Date and time calc or ThreeLinesDiary?

Date and time calc ships an update every 16 months, and ThreeLinesDiary every 6 months. Most recently, Date and time calc was updated on July 23, 2026 and ThreeLinesDiary on September 8, 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.*