# Spark vs FireSync Shift Calendar

The clearest difference is in-app purchases: FireSync Shift Calendar at none against Spark's 2. On price, rating, review sentiment and ratings volume there is nothing between them.

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

On the App Store both sit at effectively the same score — 4.8 for Spark against 4.8 for FireSync Shift Calendar. Both are backed by a comparable volume of ratings — 7.5K and 9.1K respectively. Written reviews are what separate them: 75% of Spark's written reviews are positive against 69% of FireSync Shift Calendar's.

Spark ships an update every 5 weeks, FireSync Shift Calendar every 2 months. The most recent releases landed on September 22, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Spark | FireSync Shift Calendar |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (7.5K ratings)](https://appshunter.io/ios/app/spark-shift-calendar/id390915382/reviews) | **[4.8 (9.1K ratings)](https://appshunter.io/ios/app/firesync-shift-calendar/id811674374/reviews)** |
| Number of ratings | 7.5K | **9.1K** |
| Positive reviews | **74.5% of reviews** | 69.2% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 2 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 14 MB | 176 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [E.L.K. Equities LLC](https://appshunter.io/developer/1775442602) | [ForceReadiness.com](https://appshunter.io/developer/412513833) |

## 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

**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


### FireSync Shift Calendar

[App page](https://appshunter.io/ios/app/firesync-shift-calendar/id811674374)

This app is a comprehensive calendar designed for firefighters, offering robust shift tracking, event management, and cloud integration. It allows users to manage trades, overtime, and personal events, with features like CertTracker and Expenditure tracking. It also syncs with other calendars and devices for seamless organization.

**Highlights:** Firefighter shift schedule tracking, Event management (trades, overtime, personal), Cloud integration with FireSync Enterprise™, CertTracker and Expenditure tracking, Customizable shift editor, Year and month calendar views, Report generation and emailing

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Share capable
- 👍 Perfect setup
- 👍 User friendly and simple
- 👍 Easy to use
- 👍 Convenient

**What reviewers complain about**

- 🐛 Randomly deletes events
- 🔒 Trouble with calendar access
- 🐛 Holiday icon disappeared
- 🐛 Erased all info
- 🐛 Verification not working

**Reported bugs**

- Randomly deletes events
- Trouble with calendar access
- Holiday icon disappeared
- Erased all info
- Verification not working

**Requested features**

- Color customization for days
- Shift designation by number
- Custom FLSA start/end dates
- Customizable pay days
- Shift trade feature


## Frequently asked questions

### Is Spark free?

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

### Is FireSync Shift Calendar free?

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

### Which has better reviews, Spark or FireSync Shift Calendar?

FireSync Shift Calendar is rated higher. Spark averages 4.8 out of 5 from 7.5K ratings, while FireSync Shift Calendar averages 4.8 from 9.1K ratings.

### Do Spark or FireSync Shift Calendar have ads?

Neither Spark nor FireSync Shift Calendar shows ads.

### Which is updated more often, Spark or FireSync Shift Calendar?

Spark ships an update every 5 weeks, and FireSync Shift Calendar every 2 months. Most recently, Spark was updated on September 22, 2026 and FireSync Shift Calendar on September 24, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*