# MultiDeco vs Buoyancy Calc

The clearest difference is price: Buoyancy Calc at Free against MultiDeco's $48.99. Buoyancy Calc also leads on iOS requirement (15.6 vs 17.6). MultiDeco's advantage is rating (3.9 vs 3.1). On review sentiment, ratings volume, update cadence and ads there is nothing between them.

Buoyancy Calc is free to download; MultiDeco costs $48.99 up front. Neither carries in-app purchases, so what you see is what you pay.

MultiDeco holds the better App Store score, 3.9 against 3.1. Both are backed by a comparable volume of ratings — 11 and 25 respectively. Written reviews complicate that: 39% of MultiDeco's written reviews are positive against 40% of Buoyancy Calc's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on September 19, 2026 and June 8, 2026 respectively.

## The numbers

| Metric | MultiDeco | Buoyancy Calc |
| --- | --- | --- |
| Price | $48.99 | **Free** |
| Rating | **[3.9 (11 ratings)](https://appshunter.io/ios/app/multideco/id781437836/reviews)** | [3.1 (25 ratings)](https://appshunter.io/ios/app/buoyancy-calc/id1482332472/reviews) |
| Number of ratings | 11 | **25** |
| Positive reviews | 38.9% of reviews | **40.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Paid | **Free** |
| Size | 2 MB | 1 MB |
| Requires iOS | 17.6 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HHS Software Corp.](https://appshunter.io/developer/301978863) | [Eric Hamiter](https://appshunter.io/developer/1482332471) |

## What reviewers say

### MultiDeco

[App page](https://appshunter.io/ios/app/multideco/id781437836)

This app calculates dive decompression for technical scuba divers using VPM and ZHL-16 models. It supports various gas mixes, planning methods for open circuit and rebreathers, and includes tools for gas blending and depth calculations.

**Highlights:** VPM and ZHL-16 decompression models, Support for nitrox and trimix, OC and CCR planning, Bailout planning, Gas blending utility, Depth calculation tools

**In-app purchases:** none


### Buoyancy Calc

[App page](https://appshunter.io/ios/app/buoyancy-calc/id1482332472)

Calculate the optimal weight for scuba diving based on environmental factors. Input your weight, water type, tank, and exposure suit to get a suggested weight for neutral buoyancy.

**Highlights:** Calculate suggested diving weight, Adjust for water type, Adjust for tank type, Adjust for exposure suit, Supports pounds and kilograms

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MultiDeco free?

MultiDeco costs $48.99, with no in-app purchases.

### Is Buoyancy Calc free?

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

### Which has better reviews, MultiDeco or Buoyancy Calc?

MultiDeco is rated higher. MultiDeco averages 3.9 out of 5 from 11 ratings, while Buoyancy Calc averages 3.1 from 25 ratings.

### Do MultiDeco or Buoyancy Calc have ads?

Neither MultiDeco nor Buoyancy Calc shows ads.

### Which is updated more often, MultiDeco or Buoyancy Calc?

MultiDeco ships an update every 3 months, and Buoyancy Calc every 3 months. Most recently, MultiDeco was updated on September 19, 2026 and Buoyancy Calc on June 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.*