# FireSync Shift Calendar vs ResponderOS

The clearest difference is in-app purchases: FireSync Shift Calendar at none against ResponderOS's 1. FireSync Shift Calendar also leads on ratings volume (9.1K vs 1). ResponderOS's advantage is update cadence (fortnightly vs every 2 months) and rating (5.0 vs 4.8). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ResponderOS sells 1 in-app purchase, starting at $4.99 per month. FireSync Shift Calendar asks for nothing beyond the download.

ResponderOS holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: FireSync Shift Calendar has 9.1K ratings behind it against 1, so its average is the more settled of the two.

FireSync Shift Calendar ships an update every 2 months, ResponderOS fortnightly. The most recent releases landed on October 20, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | FireSync Shift Calendar | ResponderOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (9.1K ratings)](https://appshunter.io/ios/app/firesync-shift-calendar/id811674374/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/responderos/id6772283560/reviews)** |
| Number of ratings | **9.1K** | 1 |
| Positive reviews | 69.2% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Paid | **Free** |
| Size | 176 MB | 165 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [ForceReadiness.com](https://appshunter.io/developer/412513833) | [Jason Jones](https://appshunter.io/developer/6772283562) |

## What reviewers say

### 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


### ResponderOS

[App page](https://appshunter.io/ios/app/responderos/id6772283560)

This suite provides essential tools for fire and EMS professionals, offering immediate access to operational references, clinical support, incident management, personnel documentation, and task tracking. It's designed for use in the field, during shifts, and for daily operations, empowering responders with critical information without departmental delays.

**Highlights:** Field Operations Reference (SceneKit), Clinical Tools for EMS (MedKit), Incident Management (CommandKit Lite), Personnel Documentation (PersonnelKit), Task Management (TaskKit), Includes multiple operational kits

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ResponderOS Individual | $4.99 | per month |


## Frequently asked questions

### Is FireSync Shift Calendar free?

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

### Is ResponderOS free?

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

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

ResponderOS is rated higher. FireSync Shift Calendar averages 4.8 out of 5 from 9.1K ratings, while ResponderOS averages 5.0 from 1 ratings.

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

Neither FireSync Shift Calendar nor ResponderOS shows ads.

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

FireSync Shift Calendar ships an update every 2 months, and ResponderOS fortnightly. Most recently, FireSync Shift Calendar was updated on October 20, 2026 and ResponderOS on October 15, 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.*