# Time Calculator Premium vs RosterSync

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.

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.

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.

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

## The numbers

| Metric | Time Calculator Premium | RosterSync |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | [4.6 (10 ratings)](https://appshunter.io/ios/app/time-calculator-premium/id1048440277/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/rostersync/id6759645143/reviews)** |
| Number of ratings | **10** | 3 |
| Positive reviews | 68.8% of reviews | **80.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 5 MB | 69 MB |
| Requires iOS | **15.6** | 18.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Adrien Brecheteau](https://appshunter.io/developer/956859837) | [AeroSync Studio](https://appshunter.io/developer/1888070954) |

## What reviewers say

### Time Calculator Premium

[App page](https://appshunter.io/ios/app/time-calculator-premium/id1048440277)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### RosterSync

[App page](https://appshunter.io/ios/app/rostersync/id6759645143)

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:** macOS Compatibility, Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro 버전 업그레이드 | $2.99 | one-time |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*