PostalCal vs KARR Security
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
PostalCal
This calendar app is designed for postal employees with rotating days off. It displays paydays and postal holidays, eliminating the need for annual paper calendars. Optional in-app purchases allow for color customization and adding personal events.
- Rotating days off calendar
- Payday display
- Postal observed holidays
- Customizable color rotations
- Add personal events
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Postal Employee Day Off Calendar Are you a postal employee with rotating days off? This app is for you. Postal Employee Day Off Calendar is a simple, purpose-built calendar for USPS postal workers and their families. It clearly shows every pay day and postal‑observed holiday so you always know what’s coming. Instead of buying a new paper color calendar every year, make a one‑time purchase and keep everything on your phone. Want more control? Unlock two optional upgrades: Customize calendar colors to match your own rotation. Add your own events directly to the calendar.
KARR Security
This app enhances KARR Security systems, offering theft prevention and GPS-based vehicle recovery. It provides convenient, selectable features for seamless integration with the security products.
- Seamless integration with KARR Security products
- Theft prevention features
- GPS-based vehicle recovery
- Convenient and selectable features
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The KARR Security companion App is designed with convenient and selectable features for seamless integration with KARR Security products. KARR Security systems are theft prevention and GPS based recovery devices offered at most automotive dealers across the United States.
Screenshots
Verdict
The clearest difference is price: KARR Security at Free against PostalCal's $5.99. KARR Security also leads on in-app purchases (none vs 2) and ratings volume (190 vs 1). PostalCal's advantage is rating (5.0 vs 2.9) and review sentiment (72% vs 44%). On 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
KARR Security is free to download; PostalCal costs $5.99 up front. PostalCal sells 2 one-off in-app purchases. KARR Security asks for nothing beyond the download.
PostalCal holds the better App Store score, 5.0 against 2.9. That said, the two scores are not equally well evidenced: KARR Security has 190 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 72% of PostalCal's written reviews are positive against 44% of KARR Security's.
PostalCal ships an update every 9 months, KARR Security every 2 months. Both last shipped on October 15, 2026.
| Parameter | PostalCal | KARR Security |
|---|---|---|
| Price | $5.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | 2.9 (190 ratings) |
| Positive reviews | 72.2% of reviews — better | 44.0% of reviews |
| Number of ratings | 1 | 190 — better |
| Update frequency | Every 9 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #111 — better | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 26.0 | 15.0 — better |
| Further details — not scored | ||
| Size | 1 MB | 189 MB |
| Age rating | 4+ | 4+ |
| Developer | Andrew Franco | WEBHOUSE SOFTWARE SOLUTIONS PTY LTD |
Customer experience
PostalCal
KARR Security
User reviews
PostalCal
From 1 App Store ratingsWhat we love
- 👍 Easy to use calendar
- 🗓️ Helpful for planning
- 👨👩👧👦 Simplifies family scheduling
- 🎨 Customizable colors
- ✅ Great functionality
Room to improve
- 🐛 Crashing issues
- 📅 Outdated information
- ⏳ Lacks future year updates
- ❌ Re-purchase required
- 🐛 App not opening
KARR Security
From 190 App Store ratingsWhat we love
- 🚀 Efficient tracking and notifications
- 🔒 Helpful security features
- 👍 User-friendly app interface
- 💡 Convenient vehicle management
Room to improve
- 🐛 Connectivity and reliability issues
- 🔍 Inaccurate location tracking
- 💤 Limited remote functionality
- 🤔 Confusing setup and onboarding
Bugs and requests
PostalCal
Reported bugs
15 issues- Re-purchase required after payment
- No dates after 11th day
- No 10 shows up
- Last weeks of months have dots instead of dates
- Month & Year not displayed
Show 10 moreShow fewer
- Juneteenth holiday not updated
- Memorial Day date incorrect (May 24th instead of 31st)
- Graphic issues on iPad
- App crashes on opening
- App won't open after iOS update
- App crashes on current month
- Error on August 23rd (should be black, not blue)
- Pay period info missing
- Cannot swipe back
- App kicks out when selecting a month
Requested features
13 requests- Sync with other calendars (iCal)
- Add custom events option
- Ability to add notes
- Integrate weather
- Add mail volumes manually
Show 8 moreShow fewer
- See a couple years ahead
- Update for future years
- Add events to days
- Link days off with iOS calendar
- Ability to shut off unwanted colors
- Mark days taken off (s/l or a/l)
- Add non-postal holidays
- Option to add notes for a fee
KARR Security
Reported bugs
4 issues- App crashes and freezes frequently
- Notifications not working as expected
- Inconsistent connectivity with vehicle
- Incorrect vehicle location reporting
Requested features
4 requests- Improve remote lock/unlock capabilities
- Provide more detailed location tracking
- Add support for smartwatch integration
- Enhance customization options
In-app purchases
PostalCal
- Custom Calendar Colors$3.99
- Calendar Events$4.99
KARR Security
No in-app purchases
