# NAUI vs 21Counts

The clearest difference is device support: NAUI at 3 against 21Counts's 1. NAUI also leads on iOS requirement (14.0 vs 18.6). On price, 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.

## The numbers

| Metric | NAUI | 21Counts |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (48 ratings)](https://appshunter.io/ios/app/naui/id1441033077/reviews)** | — |
| Number of ratings | **48** | — |
| Positive reviews | 17.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | — |
| Monetization | Free | — |
| Size | 120 MB | 26 MB |
| Requires iOS | **14.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [NAUI Worldwide](https://appshunter.io/developer/1441033076) | [Suwitcha Sugthana](https://appshunter.io/developer/372726303) |

## What reviewers say

### NAUI

[App page](https://appshunter.io/ios/app/naui/id1441033077)

Access your NAUI certifications, training materials, and dive logs on your mobile device. Find local dive stores, manage students, and utilize dive planning tools. Stay updated with the latest news and events from NAUI Worldwide.

**Highlights:** Access CORE profile and certifications, Digital C-Cards and achievements, Locate NAUI dive stores and professionals, Access eLearning courses, Manage and certify students, Digital dive logs, Dive planning tools

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

**In-app purchases:** none


### 21Counts

[App page](https://appshunter.io/ios/app/21counts/id6763789288)

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

**In-app purchases:** none


## Frequently asked questions

### Is NAUI free?

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

### Is 21Counts free?

21Counts is free to download, with no in-app purchases.

### Do NAUI or 21Counts have ads?

Neither NAUI nor 21Counts shows ads.

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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.*