# Narwal vs Corterra Book

The clearest difference is rating: Corterra Book at 5.0 against Narwal's 3.7. Narwal's advantage is ratings volume (617 vs 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.

Corterra Book holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Narwal has 617 ratings behind it against 1, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 2 weeks. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Narwal | Corterra Book |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (617 ratings)](https://appshunter.io/ios/app/narwal/id1636748263/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/corterra-book/id6766128317/reviews)** |
| Number of ratings | **617** | 1 |
| Positive reviews | 41.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | Every 2 weeks |
| Monetization | Free | Free |
| Size | 322 MB | 33 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yunjing Intelligence Innovation (Shenzhen) Co., Ltd.](https://appshunter.io/developer/1462004351) | [Stem Creations](https://appshunter.io/developer/1833972982) |

## What reviewers say

### Narwal

[App page](https://appshunter.io/ios/app/narwal/id1636748263)

Remotely control and monitor your cleaning robot from anywhere. Customize cleaning modes, schedules, and spot cleaning for a spotless home. Receive detailed cleaning reports and manage room layouts with no-go zones.

**Highlights:** Remote control and monitoring, Multiple cleaning modes, Customized cleaning plans, Spot cleaning functionality, Map management with no-go zones, Customized cleaning reports

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Great machine, easy to operate
- 👍 Dependable and helps with allergies
- 💡 Excellent app and device
- 👍 Fantastic cleaning performance
- 👍 Seamless on hardwood and carpets

**What reviewers complain about**

- 🐛 Mapping and room splitting issues
- 🐛 Connectivity problems with app
- 🐛 Buggy and unstable app
- 🐛 Difficult to use app interface
- 🐛 Lack of push notifications and status updates

**Reported bugs**

- App crashes and freezes
- Connectivity issues between app and robot
- Mapping errors and inability to edit maps
- Unreliable scheduling and cleaning tasks
- Unexpected robot behavior and getting stuck

**Requested features**

- Ability to split rooms and create custom zones
- Improved mapping and room editing features
- More scheduling options (e.g., every 2 weeks, monthly)
- Integration with voice assistants
- Ability to order replacement parts directly from the app


### Corterra Book

[App page](https://appshunter.io/ios/app/corterra-book/id6766128317)

Easily schedule, confirm, and manage appointments directly from your phone. Browse live availability, book in seconds without calls or emails, and keep all your visits organized in one place. Enjoy a calm and efficient booking experience with enhanced privacy and security.

**Highlights:** Browse live appointment availability, Book appointments in seconds, Manage upcoming and past appointments, Instant booking confirmation, Secure login with Face ID, Profile and contact detail management

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

**In-app purchases:** none


## Frequently asked questions

### Is Narwal free?

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

### Is Corterra Book free?

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

### Which has better reviews, Narwal or Corterra Book?

Corterra Book is rated higher. Narwal averages 3.7 out of 5 from 617 ratings, while Corterra Book averages 5.0 from 1 ratings.

### Do Narwal or Corterra Book have ads?

Neither Narwal nor Corterra Book shows ads.

### Which is updated more often, Narwal or Corterra Book?

Narwal ships an update every 2 weeks, and Corterra Book every 2 weeks. Most recently, Narwal was updated on October 12, 2026 and Corterra Book on October 7, 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.*