# Calendar Z vs ChangeTime

The clearest difference is rating: ChangeTime at 5.0 against Calendar Z's 4.3. ChangeTime also leads on in-app purchases (none vs 1) and ads (none vs shown). Calendar Z's advantage is ratings volume (722 vs 1) and iOS requirement (16.6 vs 26.5). On price and device support there is nothing between them.

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

ChangeTime holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: Calendar Z has 722 ratings behind it against 1, so its average is the more settled of the two.

Calendar Z ships an update every 5 weeks, ChangeTime every 4 days. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Calendar Z | ChangeTime |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (722 ratings)](https://appshunter.io/ios/app/calendar-z/id1035515136/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/changetime/id6795204263/reviews)** |
| Number of ratings | **722** | 1 |
| Positive reviews | 65.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 5 weeks | **Every 4 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 12 MB | 7 MB |
| Requires iOS | **16.6** | 26.5 |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [PiyoLog Inc.](https://appshunter.io/developer/440099912) | [Formatix, LLC](https://appshunter.io/developer/6791797418) |

## What reviewers say

### Calendar Z

[App page](https://appshunter.io/ios/app/calendar-z/id1035515136)

A straightforward yet powerful calendar application designed for efficient schedule management. It features an integrated reminder system, supports Apple Watch, and offers advanced options for recurring events and event display.

**Highlights:** Integrated reminder system, Apple Watch compatibility, Advanced repeating event setup, Event display on Map, Widget support, Template function for quick event addition, Customizable appearance

**Features:** Apple Watch app

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Disappear Ads | $1.99 | one-time |

**What reviewers like**

- 👍 Intuitive and easy to use
- 🎨 Customizable colors and views
- 🗓️ Comprehensive monthly calendar view
- 🔗 Integrates with reminders and other calendars
- 🔍 Clear event details and overview

**What reviewers complain about**

- 🐛 Disappearing past events and data loss
- ⚠️ Sync and compatibility issues with other devices
- 🔍 Difficulty deleting or editing events
- 🗓️ Continuous calendar view can be confusing
- 🔔 Unreliable or missing notifications

**Reported bugs**

- Events disappearing or not saving properly
- Incorrect date/time display and sync issues
- Crashes or freezes after updates
- Compatibility problems with newer iOS versions

**Requested features**

- Ability to view and restore past events
- Improved sync and cross-device functionality
- More customization options for layout and colors
- Easier event management (editing, deleting, repeating)
- Better notification system and controls


### ChangeTime

[App page](https://appshunter.io/ios/app/changetime/id6795204263)

This app helps you track and remember when to change essential items like filters, batteries, and other consumables. It offers easy item addition, flexible date setting, and timely reminders to ensure you never miss a crucial replacement.

**Highlights:** Add items with photos or barcodes, Set change dates by voice or smart suggestions, Receive timely change reminders, Organize items by location, Printable QR labels for quick access, Apple Watch integration

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is Calendar Z free?

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

### Is ChangeTime free?

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

### Which has better reviews, Calendar Z or ChangeTime?

ChangeTime is rated higher. Calendar Z averages 4.3 out of 5 from 722 ratings, while ChangeTime averages 5.0 from 1 ratings.

### Do Calendar Z or ChangeTime have ads?

Calendar Z shows ads; ChangeTime does not.

### Which is updated more often, Calendar Z or ChangeTime?

Calendar Z ships an update every 5 weeks, and ChangeTime every 4 days. Most recently, Calendar Z was updated on November 2, 2026 and ChangeTime on October 31, 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.*