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.

What’s New

Version 1.93

minor update for text

Ratings and Reviews

4.3 out of 5
7 Ratings

7 Ratings

jam9999 ,

Decent iOS implementation

The iOS version has the basic functionality of the desktop software but is missing some of the features, such as running lost gas and OT/OD scenarios directly from the same profile. These can of course be done manually by editing the dive profile and recalculating. Generally I find the app quite handy and it lets me avoid bringing a notebook computer when traveling on dive trips.

An update for the native screen resolution of the iPhone 6 Plus and 6s Plus would be nice. It's been over a year already.

CCR Diver ,


Its missing the ability to put both CCR and OC legs in the same dive plan (this option is available in the full Mac version). This is a very useful function for easily calculating and figuring out bailout gases for CCR. (The included bailout function isn't great).

This is functionality that they will hopefully add in the next version. Sticking with the "full size" version for now.

kdubnyc ,

Good products, lazy developer

It's the only game in town, but the developer really needs a designer. It's still not formatted for the larger screens and overall the UI is pretty bad. One day someone with similar tech diving knowledge is going to come along with a really good UI and knock HHS off its throne. Lesson: never rest on your laurels. Always keep improving.


HHS Software Corp.
2.5 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Czech, Danish, Dutch, Finnish, French, German, Hungarian, Italian, Japanese, Norwegian, Polish, Portuguese, Russian, Slovak, Slovenian, Spanish, Swedish, Turkish

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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