# KALKUL vs PR Diary

The clearest difference is iOS requirement: KALKUL at 16.0 against PR Diary's 18.5. On price, update cadence, ads and in-app purchases there is nothing between them.

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

KALKUL ships an update every 6 days, PR Diary every 4 days. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | KALKUL | PR Diary |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 days | **Every 4 days** |
| Size | 71 MB | 8 MB |
| Requires iOS | **16.0** | 18.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Kalkul Inc.](https://appshunter.io/developer/1357921921) | [Yung Wen Cheng](https://appshunter.io/developer/1851202446) |

## What reviewers say

### KALKUL

[App page](https://appshunter.io/ios/app/kalkul/id6636494668)

**In-app purchases:** none


### PR Diary

[App page](https://appshunter.io/ios/app/pr-diary/id6761694656)

**In-app purchases:** none


## Frequently asked questions

### Is KALKUL free?

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

### Is PR Diary free?

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

### Do KALKUL or PR Diary have ads?

Neither KALKUL nor PR Diary shows ads.

### Which is updated more often, KALKUL or PR Diary?

KALKUL ships an update every 6 days, and PR Diary every 4 days. Most recently, KALKUL was updated on October 24, 2026 and PR Diary 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.*