# Reef vs Interval

The clearest difference is in-app purchases: Interval at none against Reef's 2. Interval also leads on device support (5 vs 3). Reef's advantage is iOS requirement (15.1 vs 26.0). On price, update cadence and ads there is nothing between them.

Both are free to download. Reef sells 2 in-app purchases, starting at $4.99 per month. Interval asks for nothing beyond the download.

Reef ships an update weekly, Interval every 4 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Reef | Interval |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reef-scuba-diving-logbook/id6761029175/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Monetization | Freemium | — |
| Size | 163 MB | 87 MB |
| Requires iOS | **15.1** | 26.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple TV, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Anton Usov](https://appshunter.io/developer/1887388788) | [Brian Groskamp](https://appshunter.io/developer/1896650103) |

## What reviewers say

### Reef

[App page](https://appshunter.io/ios/app/reef-scuba-diving-logbook/id6761029175)

Record your scuba dives with detailed information, photos, and dive site locations. Track your statistics, manage dive gear, and store certifications. This app works offline and keeps your dive history private.

**Highlights:** Log dive details (depth, duration, temp, etc.), Attach photos to dive entries, Track dive statistics, Map dive sites globally, Manage dive gear and service intervals, Store and track dive certifications

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reef Pro - Monthly | $4.99 | per month |
| Reef Pro - Yearly | $29.99 | per year |


### Interval

[App page](https://appshunter.io/ios/app/interval-dive-log/id6806797827)

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

**In-app purchases:** none


## Frequently asked questions

### Is Reef free?

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

### Is Interval free?

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

### Do Reef or Interval have ads?

Neither Reef nor Interval shows ads.

### Which is updated more often, Reef or Interval?

Reef ships an update weekly, and Interval every 4 days. Most recently, Reef was updated on October 31, 2026 and Interval on October 31, 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.*