# DiveCore vs U

The clearest difference is in-app purchases: U at none against DiveCore's 3. DiveCore's advantage is update cadence (every 4 days vs every 2 weeks) and iOS requirement (18.0 vs 26.4). On price, ads and device support there is nothing between them.

Both are free to download. DiveCore sells 3 in-app purchases, starting at $4.99 per month. U asks for nothing beyond the download.

DiveCore ships an update every 4 days, U every 2 weeks. The most recent releases landed on October 10, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | DiveCore | U |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 2 weeks |
| Monetization | Freemium | — |
| Size | 23 MB | 10 MB |
| Requires iOS | **18.0** | 26.4 |
| Devices | iPhone, Apple Watch | iPhone, Apple Watch |
| Age rating | 12+ | 4+ |
| Developer | [juseong kim](https://appshunter.io/developer/1875156558) | [Yao YungTai](https://appshunter.io/developer/6805562795) |

## What reviewers say

### DiveCore

[App page](https://appshunter.io/ios/app/divecore-dive-computer/id6758817797)

This app transforms your Apple Watch Ultra into a professional dive computer. It uses on-device AI to analyze your dives, providing insights into safety, efficiency, and consistency. Features include real-time decompression modeling, estimated dive routes, and a no-fly timer.

**Highlights:** Bühlmann ZHL-16C decompression model, Real-time NDL + decompression ceiling display, Estimated dive route visualization, No-fly timer with Live Activity, On-device AI dive scoring, Dive log with iCloud sync, Underwater color correction

**Features:** Apple Watch app

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DiveCore Pro (Monthly) | $4.99 | per month |
| DiveCore Pro (Yearly) | $29.99 | per year |
| DiveCore Pro 1-Day Pass | $2.99 | one-time |


### U

[App page](https://appshunter.io/ios/app/u-dive/id6805562793)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is DiveCore free?

DiveCore is free to download, with in-app purchases available.

### Is U free?

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

### Do DiveCore or U have ads?

Neither DiveCore nor U shows ads.

### Which is updated more often, DiveCore or U?

DiveCore ships an update every 4 days, and U every 2 weeks. Most recently, DiveCore was updated on October 10, 2026 and U on October 16, 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.*