Comparison

Availability Sync vs Block It Out

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

Head to head
About

Availability Sync

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
Read full description

Availability Sync: Share Your Availability Instantly Transform how you coordinate schedules and share your availability. Whether you're planning meetings, managing appointments, or coordinating with others, share your free time slots in seconds. FEATURES: Smart Sharing - Share available time slots instantly via text or calendar invites - Customize sharing messages for different recipients - Generate professional calendar invitations - Create personalized event titles and descriptions - Share across any messaging platform - Select multiple time slots in one go Calendar Integration - Sync with iOS, Google, and Outlook calendars - View all your calendars in one unified interface - Real-time updates as your schedule changes - Instant conflict detection Availability Management - Select and share multiple time slots at once - Customize work week and weekend schedules - Set preferred meeting durations - Define working hours for different days - Manage time zones effortlessly Time Slot Controls - Choose between 30-minute to 2-hour slots - Select entire days or specific times - Quick bulk selection options - Filter by morning, afternoon, or evening - View calendar conflicts instantly Professional Customization - Personalize event titles and descriptions - Create custom sharing messages - Choose between text or calendar format - Adjust time zone displays for recipients - Flexible date and time formats Perfect for: - Professionals sharing meeting availability - Teams coordinating across time zones - Freelancers managing client appointments - Anyone tired of back-and-forth scheduling emails Additional Features: - Support for light and dark modes - Multiple visual themes - Quick event creation - Privacy-focused design - Regular updates and improvements Download Availability Sync today and transform how you share your availability. No more endless email chains or scheduling confusion - just simple, efficient calendar sharing. Take control of your schedule sharing with Availability Sync.

About

Block It Out

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
Read full description

Block It Out is the easiest way to make sure you're never double-booked again across multiple accounts. Automatically convey availability and protect your privacy with no manual effort. Block It Out uses intelligent event blocking and performs seamless synchronization behind the scenes. Best of all, it does this without talking to the cloud or any external services. Privacy-First Design • Block out busy time in work calendars without revealing personal event details • Create "shadow events" that show you're busy without exposing sensitive information • Customize shadow event titles to maintain professional boundaries Smart Sync Rules • Set up automated rules to sync between any calendar accounts • Choose source calendars and target destination calendars • Advanced filtering options to sync only specific events • Supports recurring events with full recurrence pattern preservation Flexible Filtering • Filter events by title, duration, or custom conditions • Advanced users get hierarchical AND/OR logic for complex rules • Create sophisticated event matching patterns Seamless Background Operation • Automatic background synchronization keeps calendars updated • Real-time notifications when sync operations complete • Works across all your calendar accounts (iCloud, Google, Exchange, etc.) Perfect for Work-Life Balance • Sync personal appointments to work calendar as "busy" blocks • Maintain calendar privacy while ensuring scheduling conflicts are avoided • Professional appearance with customizable shadow event templates Perfect for Work-Work Balance • Consultants: sync your availability across competing clients • Founders: maintain clear availability across your multiple ventures, or your day job and your side hustle • Executives: give your EA access to availability across external commitments without divulging sensitive information Subscription Tiers • Free: 1 sync rule to demonstrate basic functionality • Essential: Up to 2 rules, with privacy filtering and custom shadow titles • Advanced: Unlimited rules, multiple destinations, advanced conditions, rollback capabilities, and custom templates Advanced Features (Advanced Tier) • Multiple destination calendars per rule • Custom shadow event templates and reminders • Transaction rollback system for safe operations • Hierarchical rule logic with AND/OR groups • ...and more! Whether you're coordinating between personal and work calendars, managing multiple business accounts, or simply want to maintain privacy while staying organized, Block It Out provides the automation and control you've needed since the whole thing went digital. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: https://block-it-out.com/privacy.html

Screenshots

Availability Sync4 screens
Block It Out4 screens

Verdict

The call

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.

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

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
Availability Sync versus Block It Out: the parameters behind the verdict, then further details
ParameterAvailability SyncBlock It Out
PriceFreeFree
Rating4.4 (5 ratings)5.0 (2 ratings) — better
Positive reviews66.7% of reviews100.0% of reviews — better
Number of ratings5 — better2
Update frequencyWeekly — betterEvery 10 days
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.515.5 — better
Further details — not scored
Size10 MB11 MB
Age rating4+4+
DeveloperDavid FuerstIsaiah Weiner

Customer experience

Availability Sync

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews3 reviews
Positive66.7%
Neutral0.0%
Negative33.3%

Block It Out

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Availability Sync

No in-app purchases

2 purchases

Block It Out

Subscriptions2
  • Block It Out - Essential$4.991 Month
  • Block It Out - Advanced$19.991 Month

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.

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