# Diving logbook vs NDL

The clearest difference is in-app purchases: NDL at none against Diving logbook's 3. NDL also leads on iOS requirement (12.0 vs 17.6). Diving logbook's advantage is update cadence (every 2 months vs every 5 months) and review sentiment (76% vs 67%). On price, ads and device support there is nothing between them.

Both are free to download. Diving logbook sells 3 in-app purchases, starting at $1.99 per month. NDL asks for nothing beyond the download.

Diving logbook ships an update every 2 months, NDL every 5 months. The most recent releases landed on October 24, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Diving logbook | NDL |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (96 ratings)](https://appshunter.io/ios/app/diving-logbook-dive-number/id949480835/reviews)** | — |
| Number of ratings | **96** | — |
| Positive reviews | **76.1% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 5 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 71 MB | 17 MB |
| Requires iOS | 17.6 | **12.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Denys Dykusha](https://appshunter.io/developer/930478942) | [NDL, UCH](https://appshunter.io/developer/1278307433) |

## What reviewers say

### Diving logbook

[App page](https://appshunter.io/ios/app/diving-logbook-dive-number/id949480835)

Easily record your scuba dives with an unlimited logbook. Track dive sites, conditions, equipment, and personal notes. Connect with dive partners and view comprehensive statistics.

**Highlights:** Unlimited dive entries, Extensive dive site database, Detailed dive condition logging, Equipment and gas tracking, Dive partner confirmation, Comprehensive dive statistics, User-added dive sites

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| support DiveNumber every month | $1.99 | per month |
| support DiveNumber every year | $1.99 | per year |
| support Dive Number one time | $4.99 | one-time |


### NDL

[App page](https://appshunter.io/ios/app/ndl/id1278307434)

Confirm your diver or freediver status online and save electronic certificates offline. This app offers a free log-book and No-decompression limit planner, along with the latest news from the National Dive League. Professionals can also manage certificates and access the NDL Professional Zone.

**Highlights:** Confirm diver status online, Save electronic certificates offline, Free log-book, No-decompression limit planner, Latest news from National Dive League, Manage certificates for professionals

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

**In-app purchases:** none


## Frequently asked questions

### Is Diving logbook free?

Diving logbook is free to download, with in-app purchases available.

### Is NDL free?

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

### Do Diving logbook or NDL have ads?

Neither Diving logbook nor NDL shows ads.

### Which is updated more often, Diving logbook or NDL?

Diving logbook ships an update every 2 months, and NDL every 5 months. Most recently, Diving logbook was updated on October 24, 2026 and NDL on October 8, 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.*