Comparison

d4 vs DiveCore

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

d4

Features
Read full description

Alle Ergebnisse von d4-d5.net Schachturnieren sofort verfügbar haben: • Teilnehmerlisten, Ergebnisse und Ranglisten live verfolgen • Push Ergebnisbenachrichtigungen • Ergebniseingabe für Turnierleiter

About

DiveCore

This app transforms your Apple Watch Ultra into a comprehensive dive computer, offering real-time decompression data, freediving modes, and estimated dive routes. It features AI-powered dive analysis and a detailed logbook, syncing seamlessly with its iPhone companion app for post-dive review and planning.

Highlights
  • Bühlmann ZHL-16C decompression model
  • Freediving modes (CWT, STA, DYN)
  • Estimated dive route with GPS fixes
  • Live Activity no-fly timer
  • On-device AI dive analysis
  • iCloud synchronized dive log
  • Underwater photo color correction
Features
Read full description

DiveCore — Dive Computer for Apple Watch Ultra DiveCore uses your Apple Watch Ultra's depth sensor, compass, and accelerometer to show your dive on your wrist. It syncs with the iPhone companion app and uses on-device AI to help you review your dives. [ Core Features ] Dive Computer (Apple Watch Ultra) - Bühlmann ZHL-16C with adjustable Gradient Factors - Real-time 16-tissue compartment decompression model - No-decompression limit (NDL) and decompression ceiling - Automatic safety stop countdown (3 min @ 3-6 m, credited with shallow deco stop time) - Ascent rate alarm + haptic warnings - PPO2 oxygen limit alarm - Auto water lock - HealthKit workout session integration - 30Hz smooth digital compass Freediving Mode - Depth disciplines (CWT / CWTB / FIM), static apnea (STA), dynamic apnea (DYN / DNF) - Automatic dive detection for depth, manual timer with lap entry for pool disciplines - Dive count, max depth, surface interval, heart rate, and a per-session log - A session spans many dives: surfacing starts the rest timer, and you end the session yourself - Freedive mode runs no decompression model and no gas or NDL alarms - It cannot detect shallow-water blackout. Never freedive alone, and always dive with direct, trained supervision Estimated Dive Route - Surface GPS at entry and exit; underwater path estimated from compass, motion and depth, then drift-corrected with the exit fix - 3D route view on iPhone with insights (speed, activity, pattern, current drift) This is not real underwater GPS tracking. It is a sensor-fusion estimate based on the diver's magnetic heading and motion, with both endpoints corrected by surface GPS fixes. No-Fly Timer (Live Activity) - DAN/UHMS guideline tiers (12h single no-deco / 18h repetitive or multi-day / 24h decompression), never shortened by a later dive - Lock-screen + Dynamic Island countdown AI Analysis (XAI — Explainable) - 100% on-device, no external API calls - Dive score (0-100) with itemized breakdown, stress zones and personal baseline Dive Log + Share - iCloud automatic sync across devices - Logs water temp, gas mix, algorithm, no-fly time; SAC and end pressure are estimated - Infographic share card; entry/exit points open in Apple Maps DiveCore Studio (Photo Editor) - Underwater color correction, depth-based red channel restoration, AI dehaze - Dive log watermark Watch Display Customization - Technical bottom bar (incl. heading), Minimal card slots and MAX ring field iPhone Companion - Detailed dive log with depth profile chart - PADI RDP dive planner, AI report, dive site location, statistics, iCloud backup [ Required Hardware ] - Apple Watch Ultra (1st generation or later) - iPhone with iOS 18+ - iCloud account + Apple Sign-In [ Accessibility ] - VoiceOver support and Dynamic Type - 14 languages [ Subscription Terms ] - DiveCore Pro (choose one; all unlock the full feature set): - Yearly: $29.99/year (KRW 44,000) - includes a 7-day free trial for new subscribers - Monthly: $4.99/month (KRW 7,700) - no free trial - 1-Day Pass: $2.99 (KRW 3,300) - 24-hour access, non-renewing (does not auto-renew) - Prices may vary by storefront and currency. - Payment is charged to your Apple ID account at confirmation of purchase - Yearly and Monthly auto-renew unless cancelled at least 24 hours before the end of the current period - If not cancelled at least 24 hours before the trial ends, you will be charged automatically - Manage or cancel your subscription anytime in your device's App Store account settings - Terms of Use (EULA): https://furyus.dev/terms - Privacy Policy: https://furyus.dev/privacy IMPORTANT SAFETY INFORMATION DiveCore is a supplementary tool for trained, certified divers. It is not a replacement for proper training, dive tables, or a backup dive computer. Always dive within the limits of your training and certification, follow your primary dive computer, and carry a redundant device. Diving carries inherent risks, including serious injury or death.

Screenshots

d41 screens
DiveCore4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. DiveCore sells 3 in-app purchases, starting at $4.99 per month. d4 asks for nothing beyond the download.

UpkeepUpdate frequency

d4 ships an update every 3 months, DiveCore every 4 days. The most recent releases landed on November 2, 2026 and November 7, 2026 respectively.

Scorecard3 real differences · 5 level
d4 versus DiveCore: the parameters behind the verdict, then further details
Parameterd4DiveCore
PriceFreeFree
Positive reviews—100.0% of reviews
Update frequencyEvery 3 monthsEvery 4 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS14.1 — better18.0
Further details — not scored
Size9 MB26 MB
Age rating4+12+
DeveloperAdrian DebbelerJuseong Kim

In-app purchases

None

d4

No in-app purchases

3 purchases

DiveCore

Subscriptions2
  • DiveCore Pro (Monthly)$4.991 Month
  • DiveCore Pro (Yearly)7 Days trial$29.991 Year
One-time1
  • DiveCore Pro 1-Day Pass$2.99

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 November 2, 2026 and DiveCore on November 7, 2026.

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