Diving Buddy: Dive Log & Plan
Logbook, nitrox & deco calcs
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
The dive log built around the calcs you actually use. Trips, sites, plans, logs — offline, on your phone. No subscription paywall on what you already wrote.
Diving Buddy is a dive log, trip planner, and calculator suite for recreational and technical divers. Plan every dive. Dive the plan. Log the story.
DIVE TRIPS & SITES
• Build a trip, drop in dive sites by name or coords, capture the briefing, plan each dive, log it later.
• Photo-backed site library — your home quarry through your bucket list.
• Emergency contacts and trip notes travel with you offline.
PLAN A DIVE THE WAY YOU'D BRIEF IT
• Target depth, gas mix, planned bottom time, buddy, role.
• Live MOD and NDL calculations as you tune the plan.
• Suggestions drawn from your historical logs at the same site.
LOG WITH THE FIELDS THAT MATTER
• Max depth, bottom time, water temp, visibility, deco stops.
• Computed SAC from your cylinder pressures — feeds back into future plans.
• Gas mix (air, nitrox, or trimix), weight, buoyancy, equipment notes.
• Free-form comments for the moments worth remembering.
THE CALCULATOR SUITE
Built around the math you actually use at the boat:
• Max Operating Depth (MOD) — every mix, every PPO2 ceiling.
• No-Decompression Limit (NDL) — Bühlmann ZH-L16C, including repetitive dives.
• Surface Air Consumption (SAC) — derive it from any logged dive.
• Run Time / Air Balance — does your gas last the planned profile?
• Nitrox blending — continuous-blend planner.
• Ascent gas required, oxygen toxicity, weight + cylinder weight change.
• Coordinate converter.
ALWAYS FREE
• Reference material: Beaufort scale, deco tables, hand signals — bundled, offline, never gated.
• Data export: every trip, dive, site, and photo as a JSON archive plus a PDF logbook. Export at any time.
• Read-only access to everything you've already logged — forever, with or without a subscription.
OPTIONAL SUBSCRIPTION
Diving Buddy offers an optional auto-renewing annual subscription at $24.99/year with a 7-day free trial, or a one-time lifetime purchase at $59.99. Subscription auto-renews unless cancelled at least 24 hours before the end of the period. Manage your subscription in your App Store account settings. Your dive logs and data remain accessible on your device whether you subscribe or not.
Terms of Use (EULA): https://divingbuddyapp.com/terms
Privacy Policy: https://divingbuddyapp.com/privacy
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Welcome to Diving Buddy 1.0.
The full app is here:
• Trips, sites, plans, and dive logs in one place.
• The calculator suite divers actually use — MOD, NDL, SAC, nitrox blending, run time, ascent gas, oxygen toxicity, and more.
• Reference material — Beaufort, deco tables, hand signals — always free, always offline.
• Apple Watch surface-interval glance.
• Data export as JSON + PDF, any time, no paywall.
Feedback welcome — Profile → Send Feedback.
The developer, Harry Richardson, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Zinctech Ltd
- Size
- 12.3 MB
- Category
- Sports
- Compatibility
Requires iOS 18.0 or later.
- iPhone
Requires iOS 18.0 or later. - Mac
Requires macOS 15.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Diving Buddy $59.99
- Diving Buddy $24.99
- Copyright
- © 2026 Zinctech Ltd
