Poseidon Reef vs SCUBAzen
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Poseidon Reef
This app helps divers log, plan, and analyze their dives. It offers detailed overviews, customizable dive logs, and advanced planning for various dive types. Connect your dive computer to manage data and firmware.
- Comprehensive dive logging
- Detailed dive planning
- Support for OC and CCR dives
- Unlimited tank support
- Decompression model selection
- Dive computer connectivity
- Cloud backup and firmware updates
Read full descriptionHide full description
Dive into the deep with Reef, the ultimate tool for every diver regardless of experience, level, or dive style. Designed to enhance and prolong your passion for diving, Reef seamlessly extends your diving experience, both before and after the actual dive. With Reef in your pocket, you're always ready to explore. Dive Log > Get a comprehensive and detailed overview of all your dives. > Easily sort and filter to find specific dives. > Import and export dives effortlessly. > Personalize dives with custom details, photos, location and more. > Engage with your dives using the interactive chart functionality. > Visualize intricate data like tank pressures, pO2, loop temperature, etc.* > Choose the data points you want to see > Zoom in on portions of the dive you are interested in Planner > Keep track of all your upcoming dives with a comprehensive overview. > Sort, filter, and organize your dive plans. > Plan for a single dive or a series of dives. > Suitable for OC (Open Circuit) and CCR (Closed Circuit Rebreather) dives. > Supports an unlimited number of tanks. > Choose between DCAP and Buhlmann decompression models. > Bailout scenario > Configure gas content Device Manager > Connect your Poseidon M28 dive computer through WiFi > View details about connected submodules. > Download, store, and back up your dives in the cloud. > Access vital service information > Monitor total dive time > Stay updated with firmware information. *Only available with Poseidon M28 dive computer
SCUBAzen
Read full descriptionHide full description
scubazen is a scuba dive log that also keeps your certifications and insurance, your gear and its servicing, your wetsuit and weight, and the paperwork a dive shop asks for. it's made for recreational divers who dive on trips and want a complete record without the admin. new in scubazen v2 scubazen is redesigned throughout, and everything in it is free except the travel agent. sign in with the same email and your logbook, gear and certifications are there as you left them. a dive log worth keeping log a day's dives in one sitting. scubazen carries over what stays the same from dive to dive, so you enter the site, the depth and the time. add photos to each dive and search the whole logbook. no signal on the boat? save anyway, and it syncs when you're back online. the right wetsuit and weight zenfinder is a wetsuit and dive weight calculator. it starts from your body, your kit and the water temperature, and the suit answer learns from your own logbook. log that you were cold in a 3 mm at 76°F, and it suggests 5 mm next time. plan the next trip the travel agent reads your certifications and your logbook, then helps you choose where to go next and what fits your diving. your first day with it is free. after that, a trip pass is $4.99 for 30 days of unlimited questions. it's the only paid part of scubazen, and it never renews on its own. ready when the shop asks keep your certification cards and dive insurance in one place, with card numbers and photos of each card. scubazen shows you when your insurance is close to expiring. paperwork, done before you land add a trip and scubazen checks what's ready for it: your gear, what you'll rent and in which sizes, your certifications and insurance. then it writes the shop's paperwork as one pdf you can send ahead. gear that's looked after keep every piece of kit with its service history. scubazen shows what's due, so the regulator gets serviced before the trip. bring your old logbook import the csv export from most dive apps and dive computer software. you check every dive before it's added. you can back up your logbook to csv files at any time. also - a packing checklist built from the kit you own - metric or imperial - a hand signals chart - seven languages: english, german, spanish, french, dutch, polish and russian terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ privacy policy: https://scubazenapp.com/privacy
Screenshots
Verdict
The clearest difference is in-app purchases: Poseidon Reef at none against SCUBAzen's 1. Poseidon Reef also leads on iOS requirement (12.1 vs 15.0). SCUBAzen's advantage is update cadence (fortnightly vs every 5 weeks). 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. SCUBAzen sells 1 one-off in-app purchase. Poseidon Reef asks for nothing beyond the download.
Poseidon Reef ships an update every 5 weeks, SCUBAzen fortnightly. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.
| Parameter | Poseidon Reef | SCUBAzen |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (2 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 2 — better | — |
| Update frequency | Every 5 weeks | Fortnightly — better |
| Ads | Yes | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 12.1 — better | 15.0 |
| Further details — not scored | ||
| Size | 58 MB | 79 MB |
| Age rating | 4+ | 4+ |
| Developer | Poseidon Diving Systems AB | SCUBAzen, LLC |
In-app purchases
Poseidon Reef
No in-app purchases
SCUBAzen
- travel agent · 30 days$4.99
Questions
Is Poseidon Reef free?
Is SCUBAzen free?
Do Poseidon Reef or SCUBAzen have ads?
Which is updated more often, Poseidon Reef or SCUBAzen?
Other comparisons















