Comparison

Time Calculator Premium vs RosterSync

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

Head to head
About

Time Calculator Premium

Easily add and subtract hours and minutes without complex conversions. This app remembers your calculations and allows for large hour amounts, plus decimal conversion. The premium version offers multiplication and division of time values.

Highlights
  • Add and subtract hours/minutes
  • Decimal time conversion
  • Save calculations
  • Multiply/divide time values
  • Ad-free experience
Features
Read full description

Our calculator is designed to help you add and subtract hours and minutes rapidly and without going into complicated conversions. Handy and user friendly, you will be able to see your calculations as you write them down and thus not loosing the thread during long additions. The App keeps all your calculations in memory after closing it. You can calculate up to hundreds of thousands of hours. You can easily convert hours in decimal for instance 2h30 = 2,5 With this Premium version you will also be able to divide and multiply your hours and minutes. The Premium version doesn’t have any adds.

About

RosterSync

Easily manage and securely share your flight rosters with this smart utility. It automatically syncs your schedule, offers robust security, and allows real-time sharing with colleagues. Export your schedule to your native calendar for seamless organization.

Highlights
  • Automated schedule sync
  • Secure login storage
  • Real-time schedule sharing
  • Privacy-controlled colleague comparison
  • Calendar export (iCloud & Google)
  • Deep-sea themed interface
Features
Read full description

A New Standard for Your Flight Life, RosterSync! RosterSync is a smart utility designed for busy airline crew members to easily manage and securely share their complex flight rosters. With a sleek deep-sea theme and robust security features, we make your aviation life more comfortable and organized. [Key Features] 1. Smart Automated Schedule Sync Log in just once to your airline portal, and RosterSync will automatically parse your complex flight schedule and display it beautifully on the in-app calendar. Easily check your layovers, off days, and flight numbers at a glance. 2. Ironclad Security with Apple Keychain Your valuable airline portal login credentials (Employee ID and Password) are securely encrypted and stored ONLY within your iPhone's native 'Keychain'. They are NEVER transmitted to any external server, ensuring your absolute privacy. 3. Real-Time Schedule Sharing & Comparison Add colleagues via social login (Apple, Google) and cross-compare your schedules in real-time. Instantly see "who is flying where" and maintain your privacy with detailed search permission settings (e.g., Public, Same Airline Only, Private). 4. Calendar Export (iCloud & Google) Seamlessly export your RosterSync schedule to your native iOS Calendar or Google Calendar. For iCloud accounts, the app can automatically create a dedicated orange 'RosterSync' calendar to keep things perfectly organized! Start a smarter, more enjoyable flight life with RosterSync today!

Screenshots

Time Calculator Premium4 screens
RosterSync4 screens

Verdict

The call

The clearest difference is price: RosterSync at Free against Time Calculator Premium's $3.99. RosterSync also leads on update cadence (every 2 days vs every 6 months) and rating (5.0 vs 4.6). Time Calculator Premium's advantage is in-app purchases (none vs 1) and ads (none vs shown). On 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

RosterSync is free to download; Time Calculator Premium costs $3.99 up front. RosterSync sells 1 one-off in-app purchase. Time Calculator Premium asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RosterSync holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 10 and 3 respectively. Written reviews point the same way: 69% of Time Calculator Premium's written reviews are positive against 80% of RosterSync's.

UpkeepUpdate frequency

Time Calculator Premium ships an update every 6 months, RosterSync every 2 days. Both last shipped on November 13, 2026.

Scorecard9 real differences · 1 level
Time Calculator Premium versus RosterSync: the parameters behind the verdict, then further details
ParameterTime Calculator PremiumRosterSync
Price$3.99Free — better
Rating4.6 (10 ratings)5.0 (3 ratings) — better
Positive reviews68.8% of reviews80.0% of reviews — better
Number of ratings10 — better3
Update frequencyEvery 6 monthsEvery 2 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.6 — better18.0
Further details — not scored
Size5 MB69 MB
Age rating4+4+
DeveloperAdrien BrecheteauAeroSync Studio

Customer experience

Time Calculator Premium

All ratings9 ratings
Positive88.9%
Neutral0.0%
Negative11.1%
Written reviews48 reviews
Positive68.8%
Neutral12.5%
Negative18.8%

RosterSync

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive80.0%
Neutral0.0%
Negative20.0%

In-app purchases

None

Time Calculator Premium

No in-app purchases

1 purchases

RosterSync

One-time1
  • Pro 버전 업그레이드$2.99

Questions

Is Time Calculator Premium free?
Time Calculator Premium costs $3.99, with no in-app purchases.
Is RosterSync free?
RosterSync is free to download, with in-app purchases available.
Which has better reviews, Time Calculator Premium or RosterSync?
RosterSync is rated higher. Time Calculator Premium averages 4.6 out of 5 from 10 ratings, while RosterSync averages 5.0 from 3 ratings.
Do Time Calculator Premium or RosterSync have ads?
RosterSync shows ads; Time Calculator Premium does not.
Which is updated more often, Time Calculator Premium or RosterSync?
Time Calculator Premium ships an update every 6 months, and RosterSync every 2 days. Most recently, Time Calculator Premium was updated on November 13, 2026 and RosterSync on November 13, 2026.

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