# Spark vs iShift Calendar

The clearest difference is in-app purchases: iShift Calendar at none against Spark's 2. iShift Calendar also leads on rating (5.0 vs 4.8) and update cadence (fortnightly vs every 5 weeks). Spark's advantage is ratings volume (7.5K vs 3). On price, ads and device support there is nothing between them.

Both are free to download. Spark sells 2 one-off in-app purchases. iShift Calendar asks for nothing beyond the download.

iShift Calendar holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Spark has 7.5K ratings behind it against 3, so its average is the more settled of the two.

Spark ships an update every 5 weeks, iShift Calendar fortnightly. The most recent releases landed on October 22, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Spark | iShift Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (7.5K ratings)](https://appshunter.io/ios/app/spark-shift-calendar/id390915382/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/ishift-calendar/id1025844734/reviews)** |
| Number of ratings | **7.5K** | 3 |
| Positive reviews | 74.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Fortnightly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 10 MB | 5 MB |
| Requires iOS | 15.6 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [E.L.K. Equities LLC](https://appshunter.io/developer/1775442602) | [Sheng-Yi Chang](https://appshunter.io/developer/975535820) |

## What reviewers say

### Spark

[App page](https://appshunter.io/ios/app/spark-shift-calendar/id390915382)

This app simplifies shift work for professionals like first responders and healthcare workers. It offers full customization, secure cloud syncing, and streamlined shift trading. Plan your life and stay organized with instant visual cues and reliable support.

**Highlights:** Full shift customization, Secure cloud sync, Streamlined shift trades, Instant visual cues, Comprehensive shift coverage, User-friendly interface

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription Renewal | $0.99 | one-time |
| Initial Annual Subscription | $5.99 | one-time |

**What reviewers like**

- 🚀 Excellent calendar app
- 👍 Easy to use and set up
- 🔒 Secure and reliable
- 💡 Customizable and feature-rich
- 👍 Great for shift work and emergency services

**What reviewers complain about**

- 🐛 Occasional crashes and bugs
- 💰 Subscription model and pricing issues
- 🔧 Needs more frequent updates
- 🔧 Compatibility issues with newer devices
- 🔧 Lack of certain features (e.g., widgets, dark mode)

**Reported bugs**

- Login and authentication problems
- Data loss and sync issues after updates
- Unreliable performance on some devices

**Requested features**

- Ability to sync with more calendar services
- More customization options
- Improved user interface and design
- Ability to view past schedules and events


### iShift Calendar

[App page](https://appshunter.io/ios/app/ishift-calendar/id1025844734)

This app generates repeating shift calendars based on user-defined shift rules. It allows for the management of multiple shift tables, supporting both personal and enterprise use cases with an integrated database for some enterprise schedules.

**Highlights:** Automatic shift calendar generation, Input custom shift rules, Manage multiple shift tables, Support for personal and enterprise tables, Built-in enterprise shift table database

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Spark free?

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

### Is iShift Calendar free?

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

### Which has better reviews, Spark or iShift Calendar?

iShift Calendar is rated higher. Spark averages 4.8 out of 5 from 7.5K ratings, while iShift Calendar averages 5.0 from 3 ratings.

### Do Spark or iShift Calendar have ads?

Neither Spark nor iShift Calendar shows ads.

### Which is updated more often, Spark or iShift Calendar?

Spark ships an update every 5 weeks, and iShift Calendar fortnightly. Most recently, Spark was updated on October 22, 2026 and iShift Calendar on October 6, 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.*