MultiDeco vs Surface Air Consumption
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MultiDeco
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.
- VPM and ZHL-16 decompression models
- Support for nitrox and trimix
- OC and CCR planning
- Bailout planning
- Gas blending utility
- Depth calculation tools
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A dive decompression calculator for technical scuba divers. MultiDeco presents the VPM and ZHL-16 decompression model and includes VPM-B, VPM-B/E, ZHL model versions and ZHL-16 + GF. The diver can specify any combination of nitrox or trimix, and as many deco gases as required. Planning methods include both OC and Closed Circuit Rebreather. It includes planning for bailouts with SCR and OC legs in a CCR plan. Includes details of ppO2, END, and gas consumptions. This program includes many of the features from the desktop version such as conservatism adjustments, extended stops, adjustable last stops, the planning monitor system and extensive control over many other planning features. Also included is a set of dive planning tools for calculating best mix, maximum operating depth (MOD), END, EAD and other planning considerations. The Mixer utility for blending nitrox and trimix, is included too.
Surface Air Consumption
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.
- Calculates SAC Rate
- Estimates air requirements at depth
- User input based calculations
- Dive profile analysis
- Focuses solely on air consumption
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This software calculates Surface Air Consumption (SAC Rate) and air requirements at depth based on user input data ONLY. This software DOES NOT calculate nitrogen absorption and/or decompression limits. Please see US Navy decompression tables for that information. This software only calculates how much air is required based on user entered data and dive profile. Know your limits and dive within them. Always error on the side of safety. Leridian Dynamics, Inc. assumes no liability for the use and/or misuse of this software.
Screenshots
Verdict
The clearest difference is review sentiment: Surface Air Consumption at 100% against MultiDeco's 39%. Surface Air Consumption also leads on price (Free vs $48.99) and rating (5.0 vs 3.9). MultiDeco's advantage is ratings volume (11 vs 2). On ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Surface Air Consumption is free to download; MultiDeco costs $48.99 up front. 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 3.9. That said, the two scores are not equally well evidenced: MultiDeco has 11 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 39% of MultiDeco's written reviews are positive against 100% of Surface Air Consumption's.
MultiDeco ships an update every 3 months, Surface Air Consumption weekly. The most recent releases landed on October 6, 2026 and October 16, 2026 respectively.
| Parameter | MultiDeco | Surface Air Consumption |
|---|---|---|
| Price | $48.99 | Free — better |
| Rating | 3.9 (11 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 38.9% of reviews | 100.0% of reviews — better |
| Number of ratings | 11 — better | 2 |
| Update frequency | Every 3 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 13.6 — better |
| Further details — not scored | ||
| Size | 2 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | HHS Software Corp. | Leridian Dynamics, Inc. |
Customer experience
MultiDeco
Surface Air Consumption
In-app purchases
MultiDeco
No in-app purchases
Surface Air Consumption
No in-app purchases
Questions
Is MultiDeco free?
Is Surface Air Consumption free?
Which has better reviews, MultiDeco or Surface Air Consumption?
Do MultiDeco or Surface Air Consumption have ads?
Which is updated more often, MultiDeco or Surface Air Consumption?
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