Comparison

VizReport vs SwimDeck

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

Head to head
About

VizReport

This app provides daily water visibility reports using satellite data, helping divers plan their dives. It offers insights into sea surface temperature, chlorophyll concentration, and ocean currents, with global coverage and offline capabilities.

Highlights
  • Satellite-powered water visibility reports
  • Sea surface temperature data
  • Chlorophyll concentration tracking
  • Ocean current analysis
  • Global 3D bathymetry
  • Offline chart and data access
  • Daily data updates
Features
Read full description

VizReport is the satellite-powered water visibility platform built for divers. We deliver daily clarity reports derived from space-based ocean color sensors directly to your phone -- so you always know conditions before you suit up. Whether you're planning a reef dive in the tropics, a wreck dive on the continental shelf, or a freedive in open water, VizReport tells you exactly what to expect underwater. Built by divers, for divers. WHY DIVERS CHOOSE VIZREPORT: Water Visibility Intelligence Stop guessing. VizReport converts satellite-derived Secchi depth measurements into real underwater visibility estimates, updated daily from the Copernicus GlobColour ocean color constellation. View visibility contours overlaid on the chart to find the clearest water near you. Multiple Satellite Data Layers Go beyond visibility. VizReport gives you access to the same professional-grade ocean data used by marine scientists: Sea Surface Temperature (SST): 9 daily scans from GHRSST, MODIS, VIIRS, and AVHRR satellites. Find warm, comfortable water. Chlorophyll Concentration: 6 daily sources to identify plankton blooms that reduce visibility. True Color Imagery: See real ocean conditions -- sediment plumes, algae, and coastal runoff -- before you leave the dock. Ocean Currents: Copernicus global current analysis to plan drift dives and anticipate conditions. Global 3D Bathymetry Explore the underwater landscape before you descend. High-resolution global bathymetry reveals reef structure, walls, drop-offs, and seamounts worldwide. Combine depth data with visibility to choose the perfect dive site. On-Chart Visibility Readout Point anywhere on the chart to see estimated underwater visibility in meters or feet. VizReport converts raw satellite data into a diver-relevant visibility number so you can make informed decisions at a glance. 100% Offline Capability VizReport is built for boat use. The app automatically caches all chart layers, visibility data, and bathymetry as you view them. Browse your dive region on Wi-Fi, then head offshore with full access and zero cell signal. BETTER DATA, BETTER DIVES Global Coverage: Dive anywhere in the world. No regional restrictions. No Hardware: Just your phone. No expensive equipment needed. Daily Updates: Satellite data processed overnight and ready each morning. Visibility Contours: See clarity gradients on the chart to navigate toward clearer water. WHO IS VIZREPORT FOR? Recreational Divers: Check conditions before booking a dive. Find the clearest water in your area. Dive Operators & Guides: Choose sites with the best visibility to keep clients happy. Save fuel by running straight to clear water. Freedivers & Spearfishers: Locate warm, clear water where visibility matters most. Underwater Photographers & Videographers: Plan shoots around optimal clarity windows. Dive Trip Planners: Compare visibility trends across destinations to time your next trip perfectly. THE SCIENCE BEHIND THE CLARITY VizReport processes Secchi disk depth data from the Copernicus Marine Service's GlobColour constellation -- a global, gap-free, satellite-derived measure of water transparency updated daily. We enhance the raw data with coastal dilation to extend coverage to nearshore dive sites, then convert Secchi depth into practical dive visibility estimates. SST, chlorophyll, and true color data come directly from NASA and NOAA satellites (MODIS, VIIRS, AVHRR, PACE, and GHRSST). Download VizReport today. Know the viz before you dive. Terms of Use: https://www.geopelagic.com/terms-of-use

About

SwimDeck

Features
Read full description

Ditch the soggy paper clipboards and fragile spreadsheets. SwimDeck is the ultimate offline-first poolside companion built specifically for swim coaches to manage squads, track attendance, time multi-lane sets, and monitor swimmer progression directly on the deck. Engineered specifically for high-glare outdoor pools and high-humidity indoor aquatic centers, SwimDeck features an ultra-responsive, high-contrast user interface with large touch targets designed for fast, one-handed poolside use. KEY FEATURES FOR SWIM COACHES: ONE-TAP ATTENDANCE & ROSTER MANAGEMENT - Organize swimmers into custom training squads (Elite, Junior, Masters, Learn-to-Swim). - Track attendance in seconds with swift gestures for Present, Absent, or Tardy states. - View instant attendance summaries and squad percentage metrics. - Keep emergency contacts, dates of birth, and swimmer notes at your fingertips. MULTI-LANE CHRONOMETER & SPLIT TIMING - Built-in multi-athlete poolside stopwatch for real-time practice timing. - Record split times and finish times across multiple lanes simultaneously. - Instant lap recording paired directly to swimmer profiles. SMART WORKOUT BUILDER & SWIM-MATH ENGINE - Create, edit, and store swim practices and structured training routines. - Built-in swim-math parser automatically understands standard set notation (e.g. 10 x 100m @ 1:45). - Instant calculations for total workout distance, interval targets, and target pacing. PERSONAL BESTS (PB) & PERFORMANCE ANALYTICS - Automated PB dashboard tracking times across Long Course Meters (LCM), Short Course Meters (SCM), and Short Course Yards (SCY). - Squad leaderboards filtered by stroke (Freestyle, Backstroke, Breaststroke, Butterfly, IM), distance, course type and age group. - Log a time straight from the stopwatch and see instantly whether it is a new personal best. CERTIFICATIONS & SKILL PROGRESSION - Track stroke mechanics, safety badges, and squad advancement criteria. - Enroll swimmers into skill progression levels and update status as they master drills. 100% OFFLINE-FIRST & DECK-READY UX - Zero internet needed on deck: all data stays safe and secure on your local device. - High-contrast themes designed to combat harsh sun glare and poolside reflections. - Large, forgiving touch targets tailored for wet hands and quick execution. Transform how you run your swim practices. Download SwimDeck today and step onto the pool deck with confidence!

Screenshots

VizReport4 screens
SwimDeck4 screens

Verdict

The call

The clearest difference is in-app purchases: SwimDeck at none against VizReport's 1. VizReport's advantage is update cadence (every 5 days vs every 3 weeks). On price, ads, device support and iOS requirement 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. VizReport sells 1 in-app purchase, starting at $9.99 per month. SwimDeck asks for nothing beyond the download.

UpkeepUpdate frequency

VizReport ships an update every 5 days, SwimDeck every 3 weeks. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard2 real differences · 7 level
VizReport versus SwimDeck: the parameters behind the verdict, then further details
ParameterVizReportSwimDeck
PriceFreeFree
Rating3.7 (3 ratings) — better—
Number of ratings3 — better—
Update frequencyEvery 5 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemium—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size73 MB26 MB
Age rating4+4+
DeveloperGeoPelagic LLCMarco Lenzo

In-app purchases

1 purchases

VizReport

Subscriptions1
  • VizReport Pro7 Days trial$9.991 Month
None

SwimDeck

No in-app purchases

Questions

Is VizReport free?
VizReport is free to download, with in-app purchases available.
Is SwimDeck free?
SwimDeck is free to download, with no in-app purchases.
Do VizReport or SwimDeck have ads?
Neither VizReport nor SwimDeck shows ads.
Which is updated more often, VizReport or SwimDeck?
VizReport ships an update every 5 days, and SwimDeck every 3 weeks. Most recently, VizReport was updated on November 5, 2026 and SwimDeck on October 31, 2026.

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