NAUI JAPAN vs DiveCore
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NAUI JAPAN
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NAUI JAPANアプリでは、ダイビングやNAUIに関する情報、保有資格(NAUIダイビングCカード情報)の確認、SNSやオンラインショップなど魅力満載な情報をお届けします! ぜひアプリをインストールして、以下の様々なコンテンツをご利用ください。 「お知らせ」 ダイビングやNAUIに関する情報を発信しています。 各種イベント情報や安全にダイビングを行うための普及啓発、新商品や期間限定NAUIオリジナルグッズの販売などをご案内します。 「資格確認フォーム」 一般ダイバーとNAUIメンバーを対象とした2種類のフォームをご用意しています。 旅先でうっかりCカードを忘れたことに気づいた際などにもご利用いただけます。 「Cカード再発行」 Cカードを紛失した場合、代引きやクレジットカードのお支払いで再発行が可能です。 再発行は所定のお手続きが必要ですので、余裕をもってお申し込みください。 「SNS」 NAUI JAPANの発信するSNS(Facebook,Twitter,Instagram,Youtube)をお楽しみいただけます。 ぜひフォロー・チャンネル登録をお願いします。 「オンラインショップ」 定番のNAUIオリジナルグッズのほか、新商品や期間限定グッズを販売しています。 ご近所にNAUIスクーバセンター(ダイビングショップ)がなくても、オンライン(クレジットカード決済)でご購入いただけます。 「店舗一覧」 NAUIスクーバセンター(ダイビングショップ)の店舗一覧が検索でき、各店舗の店舗情報(ショップ名、連絡先)やクーポンなどがご確認いただけます。 お気に入りのショップは「マイリスト」登録して最新情報をゲットしてください。 「NAUIコース」 初心者ダイバーコースはもとより、中・上級ダイバーコースのご案内もしています。 安心・安全なダイビングライフのためにも、ぜひ継続教育にご参加ください。 「NAUI eLearning」 時間と場所を選ばずに事前学習ができます。 店舗一覧からNAUIスクーバセンター(ダイビングショップ)を検索して、NAUI eLearningをはじめましょう! <NAUI eLearning導入コース・プログラム(2023年2月現在)> ・NAUIオープンウォーターダイバーコース ・NAUIアドバンスダイバーコース ・NAUIフィットプログラム
DiveCore
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.
- 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
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DiveCore — A real dive computer for Apple Watch Ultra DiveCore harnesses your Apple Watch Ultra's water-resistant depth sensor, compass, and accelerometer to give divers everything they need right on their wrist. It pairs with the iPhone companion app in real time and uses on-device AI to help you improve your dive patterns. [ 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 captured at entry and exit - Underwater path estimated from compass + gyro + accelerometer + depth changes - End-of-dive drift correction using exit GPS - 3D visualization on iPhone (depth profile walls, drag-to-rotate, pinch-to-zoom) - Insights: average speed, activity level, exploration pattern, current drift estimation 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 an itemized breakdown of penalties and bonuses - Real-time Risk Index and automatic stress zone detection - Personal baseline learning Dive Log + Share - iCloud automatic sync across devices - Auto-recorded: water temp, gas mix, SAC, tank pressure, algorithm, no-fly time - Infographic share card, 1080x1350 - Entry/exit coordinates 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: choose what it shows, including heading (HDG) - Minimal: 3 configurable bottom-card slots and MAX ring field (dive time, avg/max depth, water temp, HR, GF) 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) - Local currency may apply; prices are set per storefront. - 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
Screenshots
Verdict
The clearest difference is in-app purchases: NAUI JAPAN at none against DiveCore's 3. NAUI JAPAN also leads on iOS requirement (9.0 vs 18.0). DiveCore's advantage is update cadence (every 5 days vs every 14 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
Both are free to download. DiveCore sells 3 in-app purchases, starting at $4.99 per month. NAUI JAPAN asks for nothing beyond the download.
NAUI JAPAN ships an update every 14 months, DiveCore every 5 days. The most recent releases landed on October 8, 2026 and October 25, 2026 respectively.
| Parameter | NAUI JAPAN | DiveCore |
|---|---|---|
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| Update frequency | Every 14 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, Apple Watch |
| Requires iOS | 9.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 7 MB | 23 MB |
| Age rating | 4+ | 12+ |
| Developer | NAUI ENTERPRISES CO.,LTD. | juseong kim |
In-app purchases
NAUI JAPAN
No in-app purchases
DiveCore
- DiveCore Pro (Monthly)$4.991 Month
- DiveCore Pro (Yearly)7 Days trial$29.991 Year
- DiveCore Pro 1-Day Pass$2.99









