# Shift Master Shift Calendar vs First Due Mobile

The clearest difference is review sentiment: Shift Master Shift Calendar at 47% against First Due Mobile's 0%. Shift Master Shift Calendar also leads on rating (2.2 vs 1.6) and update cadence (every 5 weeks vs every 7 months). First Due Mobile's advantage is price (Free vs $1.99). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

First Due Mobile is free to download; Shift Master Shift Calendar costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Shift Master Shift Calendar holds the better App Store score, 2.2 against 1.6. Both are backed by a comparable volume of ratings — 25 and 10 respectively. Written reviews point the same way: 47% of Shift Master Shift Calendar's written reviews are positive against 0% of First Due Mobile's.

Shift Master Shift Calendar ships an update every 5 weeks, First Due Mobile every 7 months. The most recent releases landed on November 6, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Shift Master Shift Calendar | First Due Mobile |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[2.2 (25 ratings)](https://appshunter.io/ios/app/shift-master-shift-calendar/id385155631/reviews)** | [1.6 (10 ratings)](https://appshunter.io/ios/app/first-due-mobile-fedramp/id6670145457/reviews) |
| Number of ratings | **25** | 10 |
| Positive reviews | **46.9% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 7 months |
| Monetization | Free | Free |
| Best chart rank | **#87** | — |
| Size | 2 MB | 224 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gil Estes](https://appshunter.io/developer/349882768) | [Locality Media, Inc.](https://appshunter.io/developer/1355085433) |

## What reviewers say

### Shift Master Shift Calendar

[App page](https://appshunter.io/ios/app/shift-master-shift-calendar/id385155631)

**Currently charting:** #87 Top Paid · Productivity (US App Store)

A highly customizable shift calendar designed for Firefighter, EMS, and Paramedic professionals. It supports up to four platoons or teams with flexible shift patterns up to 35 days long.

**Highlights:** Fully configurable shift calendar, Supports up to 4 platoons/teams, Single or first/second shift patterns, Shift rotation up to 35 days, Designed for Firefighter, EMS, Paramedic

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Simple and easy to use
- 👍 Works for various shift rotations
- 👍 Good for long-term planning
- 👍 Customizable colors
- 👍 Prompt customer support (historically)

**What reviewers complain about**

- 🐛 App won't open/load
- 🐛 Crashes frequently
- 🐛 Lost data after updates
- 🐛 Confusing setup/not user-friendly
- 🐛 Incompatible with iOS updates

**Reported bugs**

- App does not open
- App crashes frequently
- App disappeared after iOS update
- Calendar days are purple/won't change color
- Erases notes and resets shift days after updates

**Requested features**

- Update for newest iOS versions
- Sync with iPhone calendar
- Add appointment scheduler with reminders
- Display shift letters across the top
- Enter half color/symbol for partial OT shifts


### First Due Mobile

[App page](https://appshunter.io/ios/app/first-due-mobile-fedramp/id6670145457)

Receive instant incident notifications and navigate emergency scenes with advanced routing. Access integrated building data, pre-plans, and real-time unit tracking for enhanced situational awareness and team communication.

**Highlights:** Incident tracking and notification, Emergency response routing, Integrated building data, Pre-incident planning and mapping, Team chat and communication, Live unit tracking

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

**In-app purchases:** none


## Frequently asked questions

### Is Shift Master Shift Calendar free?

Shift Master Shift Calendar costs $1.99, with no in-app purchases.

### Is First Due Mobile free?

First Due Mobile is free to download, with no in-app purchases.

### Which has better reviews, Shift Master Shift Calendar or First Due Mobile?

Shift Master Shift Calendar is rated higher. Shift Master Shift Calendar averages 2.2 out of 5 from 25 ratings, while First Due Mobile averages 1.6 from 10 ratings.

### Do Shift Master Shift Calendar or First Due Mobile have ads?

Neither Shift Master Shift Calendar nor First Due Mobile shows ads.

### Which is updated more often, Shift Master Shift Calendar or First Due Mobile?

Shift Master Shift Calendar ships an update every 5 weeks, and First Due Mobile every 7 months. Most recently, Shift Master Shift Calendar was updated on November 6, 2026 and First Due Mobile on November 4, 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.*