# Denkidai vs ShiftCal Shift Work Calendar

The clearest difference is in-app purchases: Denkidai at none against ShiftCal Shift Work Calendar's 3. Denkidai also leads on ads (none vs shown) and iOS requirement (10.0 vs 16.4). ShiftCal Shift Work Calendar's advantage is update cadence (every 5 days vs every 2 months). On price and device support there is nothing between them.

Both are free to download. ShiftCal Shift Work Calendar sells 3 in-app purchases, starting at $2.99 per month. Denkidai asks for nothing beyond the download.

Denkidai ships an update every 2 months, ShiftCal Shift Work Calendar every 5 days. The most recent releases landed on September 27, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Denkidai | ShiftCal Shift Work Calendar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 5 days** |
| Size | 8 MB | 112 MB |
| Requires iOS | **10.0** | 16.4 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [SHIGEYUKI TAKAHASHI](https://appshunter.io/developer/437200400) | [Pablo Almancio](https://appshunter.io/developer/1859498121) |

## What reviewers say

### Denkidai

[App page](https://appshunter.io/ios/app/denkidai/id483503590)

**Features:** macOS Compatibility

**In-app purchases:** none


### ShiftCal Shift Work Calendar

[App page](https://appshunter.io/ios/app/shiftcal-shift-work-calendar/id6757965010)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ShiftCal PRO Monthly | $2.99 | per month |
| ShiftCal PRO Annual | $11.99 | per year |
| ShiftCal PRO Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Denkidai free?

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

### Is ShiftCal Shift Work Calendar free?

ShiftCal Shift Work Calendar is free to download, with in-app purchases available.

### Do Denkidai or ShiftCal Shift Work Calendar have ads?

ShiftCal Shift Work Calendar shows ads; Denkidai does not.

### Which is updated more often, Denkidai or ShiftCal Shift Work Calendar?

Denkidai ships an update every 2 months, and ShiftCal Shift Work Calendar every 5 days. Most recently, Denkidai was updated on September 27, 2026 and ShiftCal Shift Work Calendar on October 12, 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.*