Comparison

NAUI JAPAN vs DiveCore

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

Head to head
About

NAUI JAPAN

Features
Read full description

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

About

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.

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
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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

NAUI JAPAN4 screens
DiveCore4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences · 5 level
NAUI JAPAN versus DiveCore: the parameters behind the verdict, then further details
ParameterNAUI JAPANDiveCore
PriceFreeFree
Positive reviews—100.0% of reviews
Update frequencyEvery 14 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone, Apple Watch
Requires iOS9.0 — better18.0
Further details — not scored
Size7 MB23 MB
Age rating4+12+
DeveloperNAUI ENTERPRISES CO.,LTD.juseong kim

In-app purchases

None

NAUI JAPAN

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 NAUI JAPAN free?
NAUI JAPAN is free to download, with no in-app purchases.
Is DiveCore free?
DiveCore is free to download, with in-app purchases available.
Do NAUI JAPAN or DiveCore have ads?
Neither NAUI JAPAN nor DiveCore shows ads.
Which is updated more often, NAUI JAPAN or DiveCore?
NAUI JAPAN ships an update every 14 months, and DiveCore every 5 days. Most recently, NAUI JAPAN was updated on October 8, 2026 and DiveCore on October 25, 2026.

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