Comparison

Spark vs First Due Mobile

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Spark

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
Read full description

Spark: Your Ultimate Shift Calendar App For over 15 years, Spark has been the go-to app for simplifying shift work. Loaded with powerful, user-friendly features, Spark helps you balance work and personal life in one place—trusted daily by fire, police, EMS, healthcare professionals, and shift workers worldwide. With Spark’s unique "Cloud Connect" system, you can sync and share your schedule across all devices, keeping you and your loved ones in the loop anytime, anywhere. Why Spark? Here’s why your colleagues love it: Full Customization Spark is designed for you. Track and log anything you need—vacation, sick time, comp time, overtime, trades, and more. Can’t find something? Add it with ease! Spark’s sleek, intuitive design lets you personalize everything to suit your work style. Secure & Reliable Your data is safe with us. Spark’s "Cloud Connect" syncs your encrypted calendar across devices, linked to your email. Lose or upgrade your phone? Just log back in, and it’s like you never left. Comprehensive Shift Coverage From pre-loaded schedules to custom department setups, Spark supports thousands of shift calendars. Don’t see yours? Easily create it, and it’s saved for you and your team. Streamlined Shift Trades & Swaps Manage and track all your trades and swaps down to the individual. Spark’s “Trade Board” lets you request and confirm trades within the app, automatically updating your calendar and stats—no extra steps. Instant Visual Cues Color-code shifts, events, and stats for at-a-glance planning. With Spark, you’ll know exactly what’s on the agenda without extra clicks. Unmatched Customer Support Our app thrives on user feedback. We’re committed to fast, helpful support, with most emails resolved in under two hours. Spark evolves with your input, making it the app you can rely on for years to come. Try Spark free for 30 days, and experience the app that’s helping shift workers around the world stay organized. Visit www.LeakyNozzle.com to learn more!

About

First Due Mobile

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
Read full description

First Due Mobile is finally here! Be notified, arrive safely and understand your scene like never before. First Due Mobile includes: -Incident tracking and notification -Emergency response specific routing -Integrated Assessor, Building Department and Fire Prevention data! -Quick size-up on every building -Detailed pre-plans on every building including residential! -Pre-Incident Planning & Mapping -Chat for easy communication with your team -Incident statusing and responding functionality -Live unit and team member tracking during incident

Screenshots

Spark4 screens
First Due Mobile4 screens

Verdict

The call

The clearest difference is review sentiment: Spark at 75% against First Due Mobile's 0%. Spark also leads on rating (4.8 vs 1.6) and ratings volume (7.5K vs 10). First Due Mobile's advantage is in-app purchases (none vs 2). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Spark holds the better App Store score, 4.8 against 1.6. That said, the two scores are not equally well evidenced: Spark has 7.5K ratings behind it against 10, so its average is the more settled of the two. Written reviews point the same way: 75% of Spark's written reviews are positive against 0% of First Due Mobile's.

UpkeepUpdate frequency

Spark ships an update every 5 weeks, First Due Mobile every 7 months. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

Scorecard7 real differences · 3 level
Spark versus First Due Mobile: the parameters behind the verdict, then further details
ParameterSparkFirst Due Mobile
PriceFreeFree
Rating4.8 (7.5K ratings) — better1.6 (10 ratings)
Positive reviews74.8% of reviews — better0.0% of reviews
Number of ratings7.5K — better10
Update frequencyEvery 5 weeks — betterEvery 7 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better17.0
Further details — not scored
Size10 MB224 MB
Age rating4+4+
DeveloperE.L.K. Equities LLCLocality Media, Inc.

Customer experience

Spark

All ratings7,510 ratings
Positive95.2%
Neutral2.9%
Negative1.9%
Written reviews159 reviews
Positive74.8%
Neutral8.8%
Negative16.4%

First Due Mobile

All ratings8 ratings
Positive12.5%
Neutral0.0%
Negative87.5%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

Bugs and requests

Spark

Reported bugs

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

Requested features

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

First Due Mobile

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

Spark

One-time2
  • Annual Subscription Renewal$0.99
  • Initial Annual Subscription$5.99
None

First Due Mobile

No in-app purchases

Questions

Is Spark free?
Spark is free to download, with in-app purchases available.
Is First Due Mobile free?
First Due Mobile is free to download, with no in-app purchases.
Which has better reviews, Spark or First Due Mobile?
Spark is rated higher. Spark averages 4.8 out of 5 from 7.5K ratings, while First Due Mobile averages 1.6 from 10 ratings.
Do Spark or First Due Mobile have ads?
Neither Spark nor First Due Mobile shows ads.
Which is updated more often, Spark or First Due Mobile?
Spark ships an update every 5 weeks, and First Due Mobile every 7 months. Most recently, Spark was updated on October 22, 2026 and First Due Mobile on October 24, 2026.

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