# MultiDeco vs JTR Calcs

The clearest difference is price: JTR Calcs at Free against MultiDeco's $48.99. JTR Calcs also leads on iOS requirement (15.0 vs 17.6). MultiDeco's advantage is update cadence (every 3 months vs every 9 months). On ads, in-app purchases and device support there is nothing between them.

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

MultiDeco ships an update every 3 months, JTR Calcs every 9 months. The most recent releases landed on October 6, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | MultiDeco | JTR Calcs |
| --- | --- | --- |
| Price | $48.99 | **Free** |
| Rating | **[3.9 (11 ratings)](https://appshunter.io/ios/app/multideco/id781437836/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 38.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 9 months |
| Monetization | Paid | — |
| Size | 2 MB | 1 MB |
| Requires iOS | 17.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HHS Software Corp.](https://appshunter.io/developer/301978863) | [Rex Harris](https://appshunter.io/developer/1709578578) |

## 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


### JTR Calcs

[App page](https://appshunter.io/ios/app/jtr-calcs/id6468682017)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is MultiDeco free?

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

### Is JTR Calcs free?

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

### Do MultiDeco or JTR Calcs have ads?

Neither MultiDeco nor JTR Calcs shows ads.

### Which is updated more often, MultiDeco or JTR Calcs?

MultiDeco ships an update every 3 months, and JTR Calcs every 9 months. Most recently, MultiDeco was updated on October 6, 2026 and JTR Calcs on October 2, 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.*