WhenWorks vs Appointment Booking System
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
WhenWorks
This app simplifies meeting scheduling by allowing clients and colleagues to book appointments online based on your defined availability. It integrates with your calendar to automatically update your schedule and send confirmations.
- Online scheduling page
- Customizable availability rules
- Calendar integration (iCloud, Google, Office 365, Outlook)
- Automatic confirmations
- Unlimited event types (Pro)
- Unlimited appointments (Pro)
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WhenWorks eliminates the hassle of scheduling meetings by allowing clients and colleagues to automatically book time with you online, only when you're free and only during the time slots you've defined. Setup is a breeze. Just install the app on your iPhone to create your free WhenWorks account and you'll immediately have a web page where guests can book appointments with you online. WhenWorks integrates directly with the built-in Calendar app on your iPhone, so it always knows your real-time availability and instantly updates your calendar as appointments are booked online. WhenWorks is ideal for anyone who needs to regularly schedule appointments with clients and colleagues, including sales people, technical support and training representatives, financial advisors, attorneys, educators, personal trainers, massage therapists, hair stylists, photographers and more. HOW IT WORKS 1. Create rules that define when, where and how long you're available to meet with others. 2. Share your scheduling link with clients and colleagues to view your availability and book appointments with you online. 3. When a guest books an appointment, a confirmation email is sent to you and the guest and the event is added to your calendar automatically. FREE The following features are provided for free in WhenWorks: • Online Scheduling Page • Unlimited Event Types • Support for iCloud, Google Calendar, Office 365 and Outlook.com • Schedule up to 5 appointments each month PRO You can optionally purchase a WhenWorks Pro auto-renewable subscription (monthly or yearly) which includes everything in the free plan plus the ability to: • Schedule unlimited appointments each month --- WHAT ARE THE SYSTEM REQUIREMENTS? Scheduling appointments involves two parties: • Host - a user who has created a WhenWorks account for Guests to view their availability and book appointments with them online. The Host must install the WhenWorks app on an iOS device running iOS 11 or greater. • Guest - a user who visits the WhenWorks website to book appointments with a Host. Guests do not need the WhenWorks app. All a Guest needs is a web browser. WHAT CALENDAR SERVICES ARE SUPPORTED? WhenWorks supports all of the leading calendar services (iCloud, Google Calendar, Office 365 and Outlook.com) but is particularly well-suited for those who use iCloud, due to its deep integration with the built-in Calendar on iOS. DO I HAVE TO USE APPLE CALENDAR? No, you don’t have to use Apple Calendar as your primary calendar app. You can use any calendar app on your iOS device, including BusyCal, Calendars 5, Fantastical, Google Calendar, Outlook, Week Calendar and others. IS MY INFORMATION SECURE? None of the details in your calendar are published online. Only your availability, in the form of time slots, is published online. What’s more, since WhenWorks is an app that integrates directly with the Calendar app on your iOS device, it does not require you to provide your login credentials for syncing with the calendaring services you use (iCloud, GoogleCalendar, Exchange, Outlook, etc.). Your sensitive login information used for accessing these services is NOT used or known by WhenWorks and is therefore not collected or stored in the app or online.ailability. PAYMENT TERMS Prices may vary by location. Your WhenWorks Pro subscription will be charged to your credit card through your iTunes account. Your subscription will automatically renew (every month or every year, depending on the term of your subscription) unless cancelled at least 24 hours before the end of the current period. You will not be able to cancel the subscription once activated. Manage your subscriptions in iTunes Account Settings. Any unused portion of a free trial period will be forfeited when the user purchases a subscription. Privacy Policy: https://docs.whenworks.app/company/privacy-policy Terms of Service (EULA): https://docs.whenworks.app/company/terms-of-service
Appointment Booking System
Quickly create a customer booking website in minutes. Customers can view available slots and book appointments online. Receive instant notifications for new bookings.
- Quick setup
- Customer booking website
- Real-time notifications
- Unlimited bookings (subscription)
- Free tier available
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Using this app you can quickly set up a booking system to accept bookings from your customers by answering a few questions. It takes only a few minutes. Afterward, you will have a link to a website that you can send to your customers. On that website they can see where you have free appointment slots and can book them. When one of your customers books an appointment, you will immediately receive a notification, and you can optionally also receive an email. You can use this app for free for booking up to 20 hours per month. If you would like to have an unlimited number of bookings each month, you can subscribe: Monthly subscription: With this subscription you can use the app for an unlimited number of bookings each month. $1.99 for each of the first 2 months, then $9.99/month. The subscription will automatically renew until you cancel it. You can manage your subscriptions in the App Store app. You can find the Terms of Use here: https://www.calengoo.com/bookingsystem/impressum.html
Screenshots
Verdict
The clearest difference is rating: Appointment Booking System at 4.5 against WhenWorks's 4.0. Appointment Booking System also leads on review sentiment (100% vs 73%). WhenWorks's advantage is update cadence (every 2 weeks vs monthly). On price, ratings volume, ads and in-app purchases 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. WhenWorks sells 2 in-app purchases, starting at $4.99 per month and Appointment Booking System sells 2 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.
Appointment Booking System holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 33 and 22 respectively. Written reviews point the same way: 73% of WhenWorks's written reviews are positive against 100% of Appointment Booking System's.
WhenWorks ships an update every 2 weeks, Appointment Booking System monthly. Both last shipped on September 17, 2026.
| Parameter | WhenWorks | Appointment Booking System |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (33 ratings) | 4.5 (22 ratings) — better |
| Positive reviews | 73.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 33 — better | 22 |
| Update frequency | Every 2 weeks — better | Monthly |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 15 MB | 71 MB |
| Age rating | 4+ | 4+ |
| Developer | Snailed It Development Ltd | Dominique Andr Gunia |
Customer experience
WhenWorks
Appointment Booking System
In-app purchases
WhenWorks
- Monthly Subscription$4.991 Month
- Annual Subscription$49.991 Year
Appointment Booking System
- Monthly subscription1 Month trial$9.991 Month
- Yearly subscription2 Months trial$99.991 Year





