# Coating OS vs AestraBook

The clearest difference is iOS requirement: AestraBook at 15.1 against Coating OS's 17.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Coating OS ships an update every 2 weeks, AestraBook every 9 days. The most recent releases landed on November 13, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | Coating OS | AestraBook |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/aestrabook/id6761083497/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 9 days** |
| Monetization | — | Free |
| Size | 202 MB | 43 MB |
| Requires iOS | 17.1 | **15.1** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Jackson Stephenson](https://appshunter.io/developer/1750033151) | [DVNTND LLC](https://appshunter.io/developer/1863528080) |

## What reviewers say

### Coating OS

[App page](https://appshunter.io/ios/app/coating-os/id6758826079)

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases:** none


### AestraBook

[App page](https://appshunter.io/ios/app/aestrabook/id6761083497)

This platform helps independent business owners manage appointments and showcase their services online. Clients can easily view offerings, check availability, and book services through a customizable page.

**Highlights:** Customizable booking page, Service and pricing management, Appointment scheduling, Deposit collection, Availability control, Client experience enhancement

**In-app purchases:** none


## Frequently asked questions

### Is Coating OS free?

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

### Is AestraBook free?

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

### Do Coating OS or AestraBook have ads?

Neither Coating OS nor AestraBook shows ads.

### Which is updated more often, Coating OS or AestraBook?

Coating OS ships an update every 2 weeks, and AestraBook every 9 days. Most recently, Coating OS was updated on November 13, 2026 and AestraBook on November 9, 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.*