Comparison

WhenAvailable vs Calendar.online

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

Head to head
About

WhenAvailable

Easily find the best date and time for group events. Suggest multiple options and let attendees vote, or RSVP to invitations. Guests don't need the app to participate.

Highlights
  • Create unlimited polls
  • Invite guests via email or link
  • Real-time poll results
  • Add themes to polls
  • RSVP to invitations
  • Guest group storage
Features
Read full description

Find the date/time that works best for a group of people. WhenAvailable helps you schedule your event based on when everyone can be there. Whether it is a dinner party, board meeting, or a guys' night out, the app makes it easy to find when works best for the group. Simply select dates and times you want to suggest for your event and then either send invitation emails to your guests through the app or copy a link to share with your guests on social media or via text messaging. Your guests do not need to have the app, sign in, or have an account to mark the times that work for them. WhenAvailable makes it quick and easy to find the best possible time for your event. Use the app for free to: - Create an unlimited number of polls - Invite up to 20 people to vote in each poll by either sending them an email invitation or sharing a link via text or social media to the poll - Real-time poll results - Add a THEME to your poll - View and send messages regarding a poll - RSVP to a poll others have sent you - Store a single guest group if you send a poll repeatedly to the same group of people - The app is always ads-free Optionally, you can buy a Premium subscription to the app. With the Premium subscription, you have a few added benefits, e.g.: - As an organizer, you can vote on behalf of your guests - Upload a cover image and logo for your poll - Invite an unlimited number of guests to the polls you create - Store an unlimited number of guest groups - Send reminders to guests who have not yet voted If you choose to purchase the Premium subscription, your subscription automatically renews annually. You can manage your subscriptions and can turn off auto-renewal by going to your iTunes Account Settings after purchase. The current subscription price is $37.99 USD per year plus tax where applicable. You may also choose to upgrade a single poll with a One-Time Premium purchase. The current price for a One-Time Premium is $9.99 USD plus tax where applicable. When you apply your One-Time Premium credit to a poll you get all the same benefits of the Premium Subscription apart from the additional guest groups. If you have any questions or feedback we are always happy to hear from you: https://whenavailable.com/contact or support@whenavailable.com Terms of Use: https://whenavailable.com/terms Privacy Policy: https://whenavailable.com/privacy

About

Calendar.online

This free online calendar facilitates team collaboration with shareable access links. Manage permissions, set passwords, and customize views for seamless group scheduling. Access your calendar from any device with a simple bookmark.

Highlights
  • Shareable access links
  • Role-based permissions (admin, editor, reader)
  • Password protection for links
  • Customizable access link views
  • Dashboard for managing calendars
  • Device bookmarking
Features
Read full description

Our product is a free online calendar for teams and groups with easy access via access links without login. An access link is structured according to the following scheme: https://calendar.online/68dbf6166ace2865ccd7 Each access link has a specific permission. E.g. administrator, editor or reader. Use the admin link to manage your calendar. You can save this link as a bookmark on all your devices, for example. You could forward the editor or reader link to your teammates. Additional settings can be made for each access link. For example: - Permissions for specific sub-calendars - Password protection for extra security - Default access link view (for example 'day', 'week' and so on) - Custom access links. For example: https://calendar.online/sports In the dashboard view of the app you can add existing access links or register a new calendar. In this case, the admin link will be added automatically on the dashboard. You can access the dashboard from the calendar at any time using the button in the top left corner. To open the settings of a calendar, please open the calendar via the administrator link and then click on the gear symbol at the top right corner.

Screenshots

WhenAvailable4 screens
Calendar.online4 screens

Verdict

The call

The clearest difference is review sentiment: Calendar.online at 94% against WhenAvailable's 50%. Calendar.online also leads on in-app purchases (none vs 2) and rating (4.7 vs 4.3). WhenAvailable's advantage is update cadence (monthly vs every 2 months). On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. WhenAvailable sells 2 in-app purchases, starting at $37.99 per year. Calendar.online asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Calendar.online holds the better App Store score, 4.7 against 4.3. That said, the two scores are not equally well evidenced: Calendar.online has 40 ratings behind it against 7, so its average is the more settled of the two. Written reviews point the same way: 50% of WhenAvailable's written reviews are positive against 94% of Calendar.online's.

UpkeepUpdate frequency

WhenAvailable ships an update monthly, Calendar.online every 2 months. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

Scorecard6 real differences · 4 level
WhenAvailable versus Calendar.online: the parameters behind the verdict, then further details
ParameterWhenAvailableCalendar.online
PriceFreeFree
Rating4.3 (7 ratings)4.7 (40 ratings) — better
Positive reviews50.0% of reviews94.1% of reviews — better
Number of ratings740 — better
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size58 MB65 MB
Age rating4+4+
DeveloperWhenAvailable LLCKalender.digital

Customer experience

WhenAvailable

All ratings7 ratings
Positive85.7%
Neutral0.0%
Negative14.3%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

Calendar.online

All ratings40 ratings
Positive90.0%
Neutral5.0%
Negative5.0%
Written reviews17 reviews
Positive94.1%
Neutral5.9%
Negative0.0%

In-app purchases

2 purchases

WhenAvailable

Subscriptions1
  • Premium Membership$37.991 Year
One-time1
  • OneTime Premium$9.99
None

Calendar.online

No in-app purchases

Questions

Is WhenAvailable free?
WhenAvailable is free to download, with in-app purchases available.
Is Calendar.online free?
Calendar.online is free to download, with no in-app purchases.
Which has better reviews, WhenAvailable or Calendar.online?
Calendar.online is rated higher. WhenAvailable averages 4.3 out of 5 from 7 ratings, while Calendar.online averages 4.7 from 40 ratings.
Do WhenAvailable or Calendar.online have ads?
Neither WhenAvailable nor Calendar.online shows ads.
Which is updated more often, WhenAvailable or Calendar.online?
WhenAvailable ships an update monthly, and Calendar.online every 2 months. Most recently, WhenAvailable was updated on October 7, 2026 and Calendar.online on October 14, 2026.

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