# Buoyancy Calc vs Surface Air Consumption

The clearest difference is review sentiment: Surface Air Consumption at 100% against Buoyancy Calc's 40%. Surface Air Consumption also leads on rating (5.0 vs 3.1) and update cadence (weekly vs every 3 months). Buoyancy Calc's advantage is ratings volume (25 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Surface Air Consumption holds the better App Store score, 5.0 against 3.1. That said, the two scores are not equally well evidenced: Buoyancy Calc has 25 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 40% of Buoyancy Calc's written reviews are positive against 100% of Surface Air Consumption's.

Buoyancy Calc ships an update every 3 months, Surface Air Consumption weekly. The most recent releases landed on October 22, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Buoyancy Calc | Surface Air Consumption |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (25 ratings)](https://appshunter.io/ios/app/buoyancy-calc/id1482332472/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/surface-air-consumption/id1532974489/reviews)** |
| Number of ratings | **25** | 2 |
| Positive reviews | 40.0% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free | Free |
| Size | 1 MB | 1 MB |
| Requires iOS | 15.6 | **13.6** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Eric Hamiter](https://appshunter.io/developer/1482332471) | [Leridian Dynamics, Inc.](https://appshunter.io/developer/1356342542) |

## What reviewers say

### 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


### Surface Air Consumption

[App page](https://appshunter.io/ios/app/surface-air-consumption/id1532974489)

This utility calculates surface air consumption (SAC) rates and air needs at depth using only user-provided dive profile data. It does not compute nitrogen absorption or decompression limits. Always prioritize safety and consult official decompression tables.

**Highlights:** Calculates SAC Rate, Estimates air requirements at depth, User input based calculations, Dive profile analysis, Focuses solely on air consumption

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Buoyancy Calc free?

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

### Is Surface Air Consumption free?

Surface Air Consumption is free to download, with no in-app purchases.

### Which has better reviews, Buoyancy Calc or Surface Air Consumption?

Surface Air Consumption is rated higher. Buoyancy Calc averages 3.1 out of 5 from 25 ratings, while Surface Air Consumption averages 5.0 from 2 ratings.

### Do Buoyancy Calc or Surface Air Consumption have ads?

Neither Buoyancy Calc nor Surface Air Consumption shows ads.

### Which is updated more often, Buoyancy Calc or Surface Air Consumption?

Buoyancy Calc ships an update every 3 months, and Surface Air Consumption weekly. Most recently, Buoyancy Calc was updated on October 22, 2026 and Surface Air Consumption on October 24, 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.*