# Pion vs Appointment Booking System

The clearest difference is in-app purchases: Pion at none against Appointment Booking System's 2. Appointment Booking System's advantage is update cadence (monthly vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Appointment Booking System sells 2 in-app purchases, starting at $9.99 per month. Pion asks for nothing beyond the download.

Pion ships an update every 3 months, Appointment Booking System monthly. The most recent releases landed on January 2, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Pion | Appointment Booking System |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (22 ratings)](https://appshunter.io/ios/app/appointment-booking-system/id1511163266/reviews)** |
| Number of ratings | — | **22** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | — | Freemium |
| Size | 8 MB | 71 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [ESTEL](https://appshunter.io/developer/1066884999) | [Dominique Andr Gunia](https://appshunter.io/developer/295407468) |

## What reviewers say

### Pion

[App page](https://appshunter.io/ios/app/pion/id1458852128)

**Features:** macOS Compatibility

**In-app purchases:** none


### Appointment Booking System

[App page](https://appshunter.io/ios/app/appointment-booking-system/id1511163266)

Quickly create a customer booking website in minutes. Customers can view available slots and book appointments online. Receive instant notifications for new bookings.

**Highlights:** Quick setup, Customer booking website, Real-time notifications, Unlimited bookings (subscription), Free tier available

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $9.99 | per month |
| Yearly subscription | $99.99 | per year |


## Frequently asked questions

### Is Pion free?

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

### Is Appointment Booking System free?

Appointment Booking System is free to download, with in-app purchases available.

### Do Pion or Appointment Booking System have ads?

Neither Pion nor Appointment Booking System shows ads.

### Which is updated more often, Pion or Appointment Booking System?

Pion ships an update every 3 months, and Appointment Booking System monthly. Most recently, Pion was updated on January 2, 2026 and Appointment Booking System on October 27, 2026.

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