# Dive Calculator vs Octavius

The clearest difference is in-app purchases: Octavius at none against Dive Calculator's 2. Octavius also leads on update cadence (monthly vs every 12 months). Dive Calculator's advantage is iOS requirement (6.0 vs 16.6). On price, review sentiment, ads and monetization model there is nothing between them.

Both are free to download. Dive Calculator sells 2 one-off in-app purchases. Octavius asks for nothing beyond the download.

Dive Calculator ships an update every 12 months, Octavius monthly. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Dive Calculator | Octavius |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (26 ratings)](https://appshunter.io/ios/app/dive-calculator/id831751437/reviews)** | — |
| Number of ratings | **26** | — |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 12 months | **Monthly** |
| Monetization | Free | Free |
| Size | 7 MB | 21 MB |
| Requires iOS | **6.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) | [Yoash Offer](https://appshunter.io/developer/769920342) |

## What reviewers say

### Dive Calculator

[App page](https://appshunter.io/ios/app/dive-calculator/id831751437)

This app provides comprehensive scuba diving calculations, including basic, nitrox, and trimix gas mixes. It supports both metric and imperial units, and allows for gas volume and cost calculations for blending and top-ups. Results can be easily copied for documentation.

**Highlights:** Basic, Nitrox, and Trimix calculations, Gas volume and cost calculations, Top-up and bleed down mix calculations, Metric and imperial unit support, Oxygen narcotic/non-narcotic selection, Copy results to clipboard

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| EANx Calculations | $0.99 | one-time |
| Trimix Calculations | $0.99 | one-time |


### Octavius

[App page](https://appshunter.io/ios/app/octavius/id1660568386)

This app helps scuba divers calculate the optimal amount of weight needed for safe underwater dives. It provides essential calculations to ensure proper buoyancy and a comfortable diving experience.

**Highlights:** Weight calculation for scuba diving, Optimal buoyancy guidance, Underwater dive planning, User-friendly interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Dive Calculator free?

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

### Is Octavius free?

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

### Do Dive Calculator or Octavius have ads?

Neither Dive Calculator nor Octavius shows ads.

### Which is updated more often, Dive Calculator or Octavius?

Dive Calculator ships an update every 12 months, and Octavius monthly. Most recently, Dive Calculator was updated on October 24, 2026 and Octavius on October 15, 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.*