# IMPACTUS vs Shift Calendar

The clearest difference is in-app purchases: IMPACTUS at none against Shift Calendar's 1. Shift Calendar's advantage is update cadence (every 2 weeks vs every 6 weeks) and device support (3 vs 1). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Shift Calendar sells 1 one-off in-app purchase. IMPACTUS asks for nothing beyond the download.

IMPACTUS ships an update every 6 weeks, Shift Calendar every 2 weeks. The most recent releases landed on October 20, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | IMPACTUS | Shift Calendar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Size | 3 MB | 6 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Fidelity Solution](https://appshunter.io/developer/1477029769) | [Dave Oakley](https://appshunter.io/developer/1868191386) |

## What reviewers say

### IMPACTUS

[App page](https://appshunter.io/ios/app/impactus/id1477029770)

**Features:** macOS Compatibility

**In-app purchases:** none


### Shift Calendar

[App page](https://appshunter.io/ios/app/shift-calendar-shiftcheck/id6801226038)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ShiftCheck Pro — Lifetime | $14.99 | one-time |


## Frequently asked questions

### Is IMPACTUS free?

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

### Is Shift Calendar free?

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

### Do IMPACTUS or Shift Calendar have ads?

Neither IMPACTUS nor Shift Calendar shows ads.

### Which is updated more often, IMPACTUS or Shift Calendar?

IMPACTUS ships an update every 6 weeks, and Shift Calendar every 2 weeks. Most recently, IMPACTUS was updated on October 20, 2026 and Shift Calendar on October 3, 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.*