# Availability Sync vs ShiftWave

The clearest difference is in-app purchases: Availability Sync at none against ShiftWave's 3. Availability Sync also leads on ads (none vs shown). ShiftWave's advantage is iOS requirement (13.0 vs 17.5). On price, update cadence and device support there is nothing between them.

Both are free to download. ShiftWave sells 3 in-app purchases, starting at $0.99 per month. Availability Sync asks for nothing beyond the download.

Availability Sync ships an update weekly, ShiftWave every 6 days. The most recent releases landed on June 2, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Availability Sync | ShiftWave |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (5 ratings)](https://appshunter.io/ios/app/availability-sync/id6670766226/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Every 6 days** |
| Monetization | Free | — |
| Size | 10 MB | 76 MB |
| Requires iOS | 17.5 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [David Fuerst](https://appshunter.io/developer/1754806202) | [MyProjectX, Inc.](https://appshunter.io/developer/505736740) |

## What reviewers say

### Availability Sync

[App page](https://appshunter.io/ios/app/availability-sync/id6670766226)

Easily share your free time slots for meetings and appointments. This app integrates with your existing calendars and allows for customized sharing messages and professional calendar invites. Streamline your scheduling process and avoid back-and-forth communication.

**Highlights:** Instant availability sharing, Calendar integration (iOS, Google, Outlook), Customizable sharing messages, Professional calendar invitations, Multiple time slot selection, Time zone management

**Features:** macOS Compatibility

**In-app purchases:** none


### ShiftWave

[App page](https://appshunter.io/ios/app/shiftwave-repeating-schedule/id6742365343)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ShiftWave Premium - Monthly | $0.99 | per month |
| ShiftWave Premium - Annual | $9.99 | per year |
| ShiftWave Premium - Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Availability Sync free?

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

### Is ShiftWave free?

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

### Do Availability Sync or ShiftWave have ads?

ShiftWave shows ads; Availability Sync does not.

### Which is updated more often, Availability Sync or ShiftWave?

Availability Sync ships an update weekly, and ShiftWave every 6 days. Most recently, Availability Sync was updated on June 2, 2026 and ShiftWave on September 10, 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.*