# K vs RosterSync

The clearest difference is in-app purchases: K at none against RosterSync's 1. K also leads on ads (none vs shown) and iOS requirement (14.5 vs 18.0). RosterSync's advantage is update cadence (every 3 days vs every 25 months). On price and device support there is nothing between them.

Both are free to download. RosterSync sells 1 one-off in-app purchase. K asks for nothing beyond the download.

K ships an update every 25 months, RosterSync every 3 days. The most recent releases landed on October 14, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | K | RosterSync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/rostersync/id6759645143/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 80.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 25 months | **Every 3 days** |
| Monetization | — | Free with in-app purchases |
| Size | 5 MB | 62 MB |
| Requires iOS | **14.5** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [항공교통본부](https://appshunter.io/developer/1436937010) | [AeroSync Studio](https://appshunter.io/developer/1888070954) |

## What reviewers say

### K

[App page](https://appshunter.io/ios/app/k-atfm/id1565102869)

**Features:** macOS Compatibility

**In-app purchases:** none


### RosterSync

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

Manage and share your flight schedules with airline crew. This utility automatically syncs your roster, offers robust security for login credentials, and allows real-time schedule comparison with colleagues. Export your schedule to your native calendar for seamless organization.

**Highlights:** Automated schedule sync, Secure credential storage, Real-time schedule sharing, Cross-comparison with colleagues, Calendar export (iCloud/Google), Privacy permission settings

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

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


## Frequently asked questions

### Is K free?

K is free to download, with no in-app purchases.

### Is RosterSync free?

RosterSync is free to download, with in-app purchases available.

### Do K or RosterSync have ads?

RosterSync shows ads; K does not.

### Which is updated more often, K or RosterSync?

K ships an update every 25 months, and RosterSync every 3 days. Most recently, K was updated on October 14, 2026 and RosterSync on October 12, 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.*