# nDeco vs OVM

The clearest difference is price: nDeco at Free against OVM's $7.99. OVM's advantage is update cadence (monthly vs every 7 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

nDeco is free to download; OVM costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

nDeco ships an update every 7 months, OVM monthly. The most recent releases landed on September 27, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | nDeco | OVM |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| Rating | **[2.0 (1 ratings)](https://appshunter.io/ios/app/ndeco/id6741527911/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Monthly** |
| Monetization | Free | — |
| Size | 73 MB | 2 MB |
| Requires iOS | 17.2 | **16.6** |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Eyal Vardi](https://appshunter.io/developer/988684101) | [data-project bv](https://appshunter.io/developer/1896180478) |

## What reviewers say

### nDeco

[App page](https://appshunter.io/ios/app/ndeco/id6741527911)

Plan multi-segment dives with ease using U.S. Navy and Bühlmann decompression models. Get instant dive information, depth limit guidance, and surface interval recommendations for safe underwater adventures.

**Highlights:** Multi-segment dive planning, U.S. Navy & Bühlmann decompression models, Depth limit guidance, Instant dive information, Surface interval recommendations, Metric/imperial unit flexibility

**Features:** macOS Compatibility

**In-app purchases:** none


### OVM

[App page](https://appshunter.io/ios/app/ovm/id6766059875)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is nDeco free?

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

### Is OVM free?

OVM costs $7.99, with no in-app purchases.

### Do nDeco or OVM have ads?

Neither nDeco nor OVM shows ads.

### Which is updated more often, nDeco or OVM?

nDeco ships an update every 7 months, and OVM monthly. Most recently, nDeco was updated on September 27, 2026 and OVM 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.*