# d4 vs DiveCore

The clearest difference is in-app purchases: d4 at none against DiveCore's 3. d4 also leads on iOS requirement (14.1 vs 18.0). DiveCore's advantage is update cadence (every 4 days vs every 3 months). 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. d4 asks for nothing beyond the download.

d4 ships an update every 3 months, DiveCore every 4 days. The most recent releases landed on October 3, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | d4 | DiveCore |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | — | Freemium |
| Size | 9 MB | 23 MB |
| Requires iOS | **14.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, Apple Watch |
| Age rating | 4+ | 12+ |
| Developer | [Adrian Debbeler](https://appshunter.io/developer/1091749079) | [juseong kim](https://appshunter.io/developer/1875156558) |

## What reviewers say

### d4

[App page](https://appshunter.io/ios/app/d4-d5/id1091749080)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is d4 free?

d4 is free to download, with no in-app purchases.

### Is DiveCore free?

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

### Do d4 or DiveCore have ads?

Neither d4 nor DiveCore shows ads.

### Which is updated more often, d4 or DiveCore?

d4 ships an update every 3 months, and DiveCore every 4 days. Most recently, d4 was updated on October 3, 2026 and DiveCore on October 8, 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.*