# Availability Sync vs Block It Out

The clearest difference is rating: Block It Out at 5.0 against Availability Sync's 4.4. Block It Out also leads on review sentiment (100% vs 67%) and iOS requirement (15.5 vs 17.5). Availability Sync's advantage is in-app purchases (none vs 2). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Block It Out sells 2 in-app purchases, starting at $4.99 per month. Availability Sync asks for nothing beyond the download.

Block It Out holds the better App Store score, 5.0 against 4.4. Both are backed by a comparable volume of ratings — 5 and 2 respectively. Written reviews point the same way: 67% of Availability Sync's written reviews are positive against 100% of Block It Out's.

Availability Sync ships an update weekly, Block It Out every 10 days. The most recent releases landed on June 2, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Availability Sync | Block It Out |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (5 ratings)](https://appshunter.io/ios/app/availability-sync/id6670766226/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/block-it-out/id6748867285/reviews)** |
| Number of ratings | **5** | 2 |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 10 days |
| Monetization | **Free** | Freemium |
| Size | 10 MB | 11 MB |
| Requires iOS | 17.5 | **15.5** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [David Fuerst](https://appshunter.io/developer/1754806202) | [Isaiah Weiner](https://appshunter.io/developer/1555820861) |

## 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


### Block It Out

[App page](https://appshunter.io/ios/app/block-it-out/id6748867285)

This app automates calendar synchronization across multiple accounts, ensuring you're never double-booked. It protects your privacy by blocking busy times without revealing personal event details, all while operating seamlessly in the background.

**Highlights:** Automated event blocking, Privacy protection for events, Seamless background synchronization, Customizable shadow event titles, Flexible filtering options, Support for recurring events

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Block It Out - Essential | $4.99 | per month |
| Block It Out - Advanced | $19.99 | per month |


## Frequently asked questions

### Is Availability Sync free?

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

### Is Block It Out free?

Block It Out is free to download, with in-app purchases available.

### Which has better reviews, Availability Sync or Block It Out?

Block It Out is rated higher. Availability Sync averages 4.4 out of 5 from 5 ratings, while Block It Out averages 5.0 from 2 ratings.

### Do Availability Sync or Block It Out have ads?

Neither Availability Sync nor Block It Out shows ads.

### Which is updated more often, Availability Sync or Block It Out?

Availability Sync ships an update weekly, and Block It Out every 10 days. Most recently, Availability Sync was updated on June 2, 2026 and Block It Out on September 19, 2026.

---

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