Mark Off vs Availability Sync
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mark Off
Organize your life and visualize progress with a versatile calendar and tracker. Create custom calendars for habits, travel, deadlines, work, and more, with visual progress tracking and customizable widgets.
- Multiple calendar types (habits, travel, deadlines, work)
- Streak tracking and statistics
- Visual progress tracking
- Customizable widgets
- Add custom images to dates
- Life journey visualization
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Welcome to MARK OFF: Tracker & Calendar, the ultimate visual tool to organize your life, track your habits and visualize your progress like never before! MARK OFF allows you to create 10 different types of calendars: 1. STREAK: Cultivate positive habits with streak tracking and insightful statistics. Customize day types, colors, and image creation to stay motivated and focused. You are not limited to tracking only daily habits - "neutral" days are added to separate bad days from the normal days without an activity. 2. TRAVEL: Log your adventures, visualize visited countries, and plan future trips effortlessly. Customize travel destinations and track visas for seamless travel planning. Add locations of visited cities and places and see them on one map. Create your own Custom Countries with a picture you want, which allows you to fit the calendar to your needs, i.e. show trips in the Cities or States 3. ACTIVITY: Monitor activities, moods, sports, symptoms and more with customizable image creation and detailed progress tracking. Enhance productivity and well-being with personalized insights. 4. DEADLINE: Stay organized and never miss a deadline again with intuitive deadline tracking. Monitor days before and after important dates to stay ahead of your tasks. For each deadline you could specify a name and a color. Create annual deadlines to track birthdays and anniversaries. 5. EMOJI: Express your daily moods and activities with emojis, creating unique images for each day. Track progress effortlessly and add multiple emojis to capture every moment. 6. WORK: Streamline work schedules, projects, and time off with customizable work types and schedules. Easily manage multiple projects and stay organized with manual entry options. You could have several schedules in parallel, i.e. to see when you and your partner are both free. 7. PROJECTS: Effectively manage projects with customizable periods and visual tracking directly on the calendar. Stay on top of deadlines and milestones with ease. 8. LIFE: Gain a holistic view of your life journey, track important moments, and visualize life stages effortlessly. Reflect on your past experiences and plan for the future with clarity. This calendar is inspired by WaitButWhy blog post "Your Life in Weeks” - Each square on calendar represents one week of your life 9. PHOTO: Enjoy daily surprises with random photos or create a personalized photo calendar with your favorite snapshots. Add a personal touch to each day and cherish memories with ease. 10. BASIC: Keep it simple with a traditional calendar where you can draw pictures for each day. Express your creativity and add personal touches to your calendar effortlessly. Other Features: - Fully Customizable Widgets: Access your calendars directly from your home screen with customizable widgets. Personalize colors, fonts and additional info for a tailored experience. - Custom Images: Create and add custom images to any date with a long tap, enhancing your calendar with personal touches and memories. - PDF reports, i.e. monthly/yearly reports with a total number of days you spent in each country, which is useful for tax and legal purposes - Notes: Add notes to any date to remember important things - Export and Import: Seamlessly export and import calendars and widgets from the app settings for convenience and flexibility. - iCloud sync and local backups: Access your calendars from different devices Make Every Day Count: Mark Off empowers you to organize your life, track your progress, and turn your goals into achievements. Download now and start making the most of each day! I hope that MARK OFF will brighten up your waiting time and help you improve your habits. I would love to know about your success stories or ideas about the app, just write me an email from the app Settings
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.
- Instant availability sharing
- Calendar integration (iOS, Google, Outlook)
- Customizable sharing messages
- Professional calendar invitations
- Multiple time slot selection
- Time zone management
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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.
Screenshots
Verdict
The clearest difference is in-app purchases: Availability Sync at none against Mark Off's 2. Availability Sync also leads on ads (none vs shown) and update cadence (weekly vs monthly). Mark Off's advantage is ratings volume (312 vs 5) and review sentiment (79% vs 67%). On price, rating, device support and iOS requirement 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
Both are free to download. Mark Off sells 2 in-app purchases, starting at $9.99 per year. Availability Sync asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 4.5 for Mark Off against 4.4 for Availability Sync. That said, the two scores are not equally well evidenced: Mark Off has 312 ratings behind it against 5, so its average is the more settled of the two. Written reviews are what separate them: 79% of Mark Off's written reviews are positive against 67% of Availability Sync's.
Mark Off ships an update monthly, Availability Sync weekly. The most recent releases landed on September 17, 2026 and June 2, 2026 respectively.
| Parameter | Mark Off | Availability Sync |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (312 ratings) — better | 4.4 (5 ratings) |
| Positive reviews | 79.1% of reviews — better | 66.7% of reviews |
| Number of ratings | 312 — better | 5 |
| Update frequency | Monthly | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.0 — better | 17.5 |
| Further details — not scored | ||
| Size | 52 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Viktor Gavrilov | David Fuerst |
Customer experience
Mark Off
Availability Sync
Bugs and requests
Mark Off
Reported bugs
10 issues- Data wiped after app updates
- App freezes when logging daily entries
- Widgets fail to load or update properly
- Year view displays blank/glitched
- Month calendar view not showing marked days
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- Unable to add widgets to home screen
- Day saving doesn't persist across sessions
- Premium subscription ads reappear via widgets
- Life calendar start/end date editing issues
- Feedback button non-functional
Requested features
6 requests- Desktop/web version with cloud sync
- Quick checkbox option without opening day details
- Streak counter widget display
- Ability to set past dates for life calendar chapters
- Improved setup and onboarding experience
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- Better documentation on feature usage
Availability Sync
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Mark Off
- Mark Off Premium$9.991 Year
- Lifetime - Premium$49.99
Availability Sync
No in-app purchases
Questions
Is Mark Off free?
Is Availability Sync free?
Which has better reviews, Mark Off or Availability Sync?
Do Mark Off or Availability Sync have ads?
Which is updated more often, Mark Off or Availability Sync?
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