Comparison

Spark vs iShift Calendar

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

iShift Calendar

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
Read full description

iShift Calendar is a general-purpose shift calendar generator. Features: 1. Input 'shift rule' (e.g.: 22330110 or 33221100), iShift will automatically generate a repeating shift calendar for you. 2. Manage multiple shift tables. 3. Support two types of shift tables: Personal and Enterprise. 4. Build-in database for some enterprise shift tables.

Screenshots

Spark4 screens
iShift Calendar4 screens

Verdict

The call

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.

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. iShift Calendar asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard6 real differences · 4 level
Spark versus iShift Calendar: the parameters behind the verdict, then further details
ParameterSparkiShift Calendar
PriceFreeFree
Rating4.8 (7.5K ratings)5.0 (3 ratings) — better
Positive reviews74.8% of reviews—
Number of ratings7.5K — better3
Update frequencyEvery 5 weeksFortnightly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.68.0 — better
Further details — not scored
Size10 MB5 MB
Age rating4+4+
DeveloperE.L.K. Equities LLCSheng-Yi Chang

Customer experience

Spark

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

iShift Calendar

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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

iShift Calendar

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

iShift Calendar

No in-app purchases

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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