Comparison

Zuul Systems vs Kairos

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

Head to head
About

Zuul Systems

Grant seamless entry to your gated community for guests. This app allows residents to send digital passes, reducing wait times and enhancing security. Registered guests can easily request passes and access community amenities.

Highlights
  • Send digital guest passes
  • Reduce gate wait times
  • Improve community security
  • Guest pass requests
  • Contact integration
  • QR code passes
  • Add passes to calendar
Features
Read full description

The ZUUL Systems app allows registered users with residential access to directly send guests a pass for entry into their gated community. Advanced features allow for a significant reduction in wait time at the gate for guests, as well as improved security measures for residents. Registered guests can request a pass from residents. Create groups, favorites, and import all your contacts directly from your phone. Passes contain your pre-scanned ID, unique QR code, and ability to get directions and add a pass to calendars as a reminder.

About

Kairos

This app helps shift workers and their families stay synchronized by providing a clear, shareable schedule. It allows users to easily track rotations, see real-time duty status, and receive notifications about upcoming shifts. Designed for professionals with complex schedules, it aims to eliminate guesswork and keep everyone informed.

Highlights
  • Shareable shift calendar
  • Real-time duty status
  • Customizable shift rotations
  • Home screen widgets
  • Apple Watch support
  • Multiple calendar tracking
Features
Read full description

Kairos is a premium shift calendar designed specifically for firefighters, medical professionals, police officers, industrial crews, and the families who support them. If you work a rotating schedule, you know how hard it can be for your spouse, kids, and friends to keep track of when you’re working, when you’re off, and when you'll be home. Kairos is built to keep your family in sync. With a clean, beautiful design, you can manage your complex shift rotation and easily share it. By sending a simple 6-character code, your loved ones can see your live schedule on their own devices. No more texting back and forth about who is on duty next weekend—everyone always knows your status at a glance. Simple Schedule Sharing - Share your calendar with a single code so family and friends always know your schedule in real-time. Track Multiple Calendars - Spouses and loved ones can easily switch between their own schedule and any shared schedules. At-a-Glance Status - Instantly see if your loved ones are working, off duty, on call, or on vacation. Shift Countdown - View exactly when a shift ends or when the next one begins. Home Screen Widgets - See duty status right from your phone's Home Screen without even opening the app. Apple Watch Support - Check current shift status, calendar, and count down the hours directly from your wrist. READY FOR ANY ROTATION Set up your calendar in seconds using common pre-set schedules (like Kelly, Panama, DuPont, 24/48, 48/96) or easily build your own custom weekly layout. Keep your family connected and take the guesswork out of shift work with Kairos! Subscriptions & Terms: Kairos Pro is available as an auto-renewable subscription: • Kairos Pro Monthly: $4.99 / month (1 month duration) • Kairos Pro Yearly: $49.99 / year (1 year duration) Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://kairosapp.dev/privacy

Screenshots

Zuul Systems2 screens
Kairos3 screens

Verdict

The call

The clearest difference is rating: Kairos at 5.0 against Zuul Systems's 3.9. Zuul Systems's advantage is in-app purchases (none vs 2) and ratings volume (35 vs 3). On price, update cadence, 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. Kairos sells 2 in-app purchases, starting at $4.99 per month. Zuul Systems asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Kairos holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: Zuul Systems has 35 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Zuul Systems ships an update weekly, Kairos every 2 weeks. The most recent releases landed on October 16, 2026 and October 1, 2026 respectively.

Scorecard5 real differences · 5 level
Zuul Systems versus Kairos: the parameters behind the verdict, then further details
ParameterZuul SystemsKairos
PriceFreeFree
Rating3.9 (35 ratings)5.0 (3 ratings) — better
Positive reviews68.0% of reviews—
Number of ratings35 — better3
Update frequencyWeekly — betterEvery 2 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.6 — better26.5
Further details — not scored
Size52 MB4 MB
Age rating4+4+
DeveloperZUUL SYSTEMS, LLCBOAZ TIMOTHY WHEALY

Customer experience

Zuul Systems

All ratings29 ratings
Positive79.3%
Neutral0.0%
Negative20.7%
Written reviews25 reviews
Positive68.0%
Neutral0.0%
Negative32.0%

Kairos

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Zuul Systems

No in-app purchases

2 purchases

Kairos

Subscriptions2
  • Kairos Pro - Monthly$4.991 Month
  • Kairos Pro - Yearly$49.991 Year

Questions

Is Zuul Systems free?
Zuul Systems is free to download, with no in-app purchases.
Is Kairos free?
Kairos is free to download, with in-app purchases available.
Which has better reviews, Zuul Systems or Kairos?
Kairos is rated higher. Zuul Systems averages 3.9 out of 5 from 35 ratings, while Kairos averages 5.0 from 3 ratings.
Do Zuul Systems or Kairos have ads?
Neither Zuul Systems nor Kairos shows ads.
Which is updated more often, Zuul Systems or Kairos?
Zuul Systems ships an update weekly, and Kairos every 2 weeks. Most recently, Zuul Systems was updated on October 16, 2026 and Kairos on October 1, 2026.

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