Comparison

TireLab vs Shift Calendar

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

Head to head
About

TireLab

This app helps you compare and visualize different tire and wheel configurations for your vehicle. It calculates key dimensions, checks for fitment issues, and provides technical references. Supports both Imperial and Metric units.

Highlights
  • Compare tire and wheel dimensions
  • Visualize configurations with cutaway views
  • Fitment calculator for vehicle compatibility
  • Technical reference and glossary
  • Imperial and Metric unit support
  • Intuitive interface
Features
Read full description

HOW TO USE TIRELAB: 1) Set wheel sizes 2) Compare and visualize differences Changing tires or rims on your vehicle? This is the app for you! TireLab is an advanced, yet VERY easy to use, tire and wheel calculator that allows the manipulation of the multiple dimensions of several tire and wheel combinations. It allows professionals, enthusiasts, and weekend mechanics the ability to examine, compare, and visualize multiple tire and wheel configurations in real time. Features: 1) Calculates, compares, and displays all key tire and wheel data points TIRE - Compatible rim sizes - Diameter - Difference - Distance per revolution (circumference) - Odometer error (difference in odometer) - Radius - Revolutions per mile - Revolutions per kilometer - Section (sidewall) height - Section width (tire width) - Size - Speedometer error (difference in speed) WHEEL - Backspace - Difference - Offset - Lip inset - Size 2) Tire/wheel configuration fitment calculator Provides the user the ability to identify vehicle fitment related issues that may potentially result from different tire and wheel configurations. - Axel/ride height - Brake component clearance - Fender (outside) clearance - Suspension (inside) clearance - Wheelwell clearance 3) Intuitive and easy to navigate interface TireLab provides for the ability to manipulate the key dimensions of both tires and wheels. If you desire to only utilize the tire modeling functionality you need only to adjust the tire measurements. All of the controls will automatically adjust to safe and compatible configuration thresholds. 4) Detailed scaled visual representations View, and compare, detailed representations of tire and wheel configurations. A unique "cutaway view" of the wheel provides the user with the ability to visualize and compare key tire and wheel measurements for multiple configurations. In addition, a unique "tire view" permits the user the ability to visualize and compare scale representations of different tire configurations. 5) Tire compatibility display Provides the user a list of compatible tire sizes and accurately indicates the differences in both tire width and tire diameter. 6) Tire and wheel technical reference Provides the user the ability to view codes, definitions, and technical specifications. -Tire construction -Load Index chart -Load Ranges -Speed Ratings -Tire types -Temperature Grades -Traction Grades -Treadwear Grades 7) Tire and wheel technical glossary Includes an extensive dictionary of tire and wheel technical terminology. 8) Imperial and Metric Full Imperial (standard) and Metric support. All information is displayed in both Imperial and Metric units.

About

Shift Calendar

A customizable shift calendar designed for firefighters, paramedics, and EMS workers. Easily track work and off days for important personal events, supporting various common shift patterns. Includes note-taking for each shift day.

Highlights
  • Customizable shift schedules
  • Supports 24/24, 24/48, 24/72 patterns
  • Supports 48x96 pattern
  • Alpha and Numeric shift naming
  • Notes for each shift day
  • Designed for firefighters and EMS
Features
Read full description

Thank you for your interest in Shift Calendar, the app designed by Firefighters and built for Firefighters. Shift Calendar is the full functioning, eternal shift calendar specifically for the professional firefighter, paramedic, EMS worker, their family and friends. No more checking shift cards to see if you will be working or off on your anniversary, birthday or other important events. This version of the Shift Calendar is configurable to present shift schedules specifically for the following: 24/24 for departments working 2 platoons 24 on 24 off. 24/48 for departments working 3 platoons 24 on 48 off. 24/72 for departments working 4 platoons 24 on 72 off. For departments working more complex schedules such as 24 on and 24 off for 5 days with 96 off as A-C-A-B-A-B-C-B-C-REPEAT, look for our ShiftCal Kelley schedule app. Newly released is the popular 48x96 for departments working 3 platoons 48 on 96 off as A-A-B-B-C-C-REPEAT. Search on Cal30 to see these other options. Shift Calendar provides for both Alpha and Numeric shift naming conventions. As of version 2.0, users can now keep notes on each shift day. Future enhancements will target Kelly Day/ADO. Spread the word and pass it around. Most of all...Thank you for all you do...

Screenshots

TireLab4 screens
Shift Calendar4 screens

Verdict

The call

The clearest difference is rating: TireLab at 5.0 against Shift Calendar's 2.3. TireLab also leads on review sentiment (68% vs 28%). Shift Calendar's advantage is monetization model (free vs paid) and update cadence (fortnightly vs every 7 months). On price, ads, in-app purchases 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

TireLab costs $1.99 and Shift Calendar $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

TireLab holds the better App Store score, 5.0 against 2.3. That said, the two scores are not equally well evidenced: Shift Calendar has 79 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 68% of TireLab's written reviews are positive against 28% of Shift Calendar's.

UpkeepUpdate frequency

TireLab ships an update every 7 months, Shift Calendar fortnightly. The most recent releases landed on October 23, 2026 and October 26, 2026 respectively.

Scorecard6 real differences · 4 level
TireLab versus Shift Calendar: the parameters behind the verdict, then further details
ParameterTireLabShift Calendar
Price$1.99$1.99
Rating5.0 (7 ratings) — better2.3 (79 ratings)
Positive reviews68.0% of reviews — better27.9% of reviews
Number of ratings779 — better
Update frequencyEvery 7 monthsFortnightly — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.08.4 — better
Further details — not scored
Size1 MB1 MB
Age rating4+4+
DeveloperMichael WeberGil Estes

Customer experience

TireLab

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews25 reviews
Positive68.0%
Neutral4.0%
Negative28.0%

Shift Calendar

All ratings71 ratings
Positive28.2%
Neutral12.7%
Negative59.2%
Written reviews68 reviews
Positive27.9%
Neutral13.2%
Negative58.8%

Bugs and requests

TireLab

Not enough reviews yet to summarise bugs or requests.

Shift Calendar

Reported bugs

26 issues
  • Download did not complete
  • App keeps crashing
  • App does not open
  • App is inoperable after Apple update
  • App crashes when opening date and adding notes
Show 21 more
  • App disappears after iOS update
  • App not compatible with latest iOS
  • App crashes when trying to open
  • App crashes when trying to open it closes back
  • Update 14.2 made app crash
  • App will not open since last IOS update
  • App ceased working upon 14.2 iOS update
  • App will not open, crashes immediately
  • App needs to be updated to new IOS
  • App will not even open with new iPhone update
  • App needs an update
  • App crashes every time you enter a note
  • App closes every time you try to enter information
  • App closes as soon as you try to type anything in the notes
  • Crashes when I add notes
  • App shuts down when you hit the space bar
  • App will shut down when you hit the space bar
  • App crashes and does not save information
  • App crashes when entering notes for specific days
  • App crashes when hitting the return key
  • App crashes when adding notes

Requested features

14 requests
  • Accommodate 48/96 schedules
  • Support for 4 on 4 off shifts
  • Support for 5 days on, 4 days off schedules
  • Support for split shifts (2x10hrs off 24 then 2x14hrs then off for 4 days)
  • Add more shift variations
Show 9 more
  • Update Kelly Style app
  • Add built-in alarm for shift days
  • Allow multiple calendars
  • More shift color options
  • Faster month/year scrolling
  • Auto-generated payday
  • Add more custom markers (T, M, etc.)
  • Option to change pattern like Kelly shift calendar
  • Notify of scheduled events

In-app purchases

None

TireLab

No in-app purchases

None

Shift Calendar

No in-app purchases

Questions

Is TireLab free?
TireLab costs $1.99, with no in-app purchases.
Is Shift Calendar free?
Shift Calendar costs $1.99, with no in-app purchases.
Which has better reviews, TireLab or Shift Calendar?
TireLab is rated higher. TireLab averages 5.0 out of 5 from 7 ratings, while Shift Calendar averages 2.3 from 79 ratings.
Do TireLab or Shift Calendar have ads?
Neither TireLab nor Shift Calendar shows ads.
Which is updated more often, TireLab or Shift Calendar?
TireLab ships an update every 7 months, and Shift Calendar fortnightly. Most recently, TireLab was updated on October 23, 2026 and Shift Calendar on October 26, 2026.

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