Daily Updates

Know the visibility before you dive.

Check underwater visibility at your favorite spots, updated daily from satellite data. No more wasting fuel on murky water.

Try VizCheck

$9.99/month after trial ends

VizCheck app second view
VizCheck app map view
Right Now
Blue Water
Visibility
35m+
Yesterday Today Tomorrow

We talk to the satellites, you check the viz

NASA and Copernicus satellites are the engine behind VizCheck

Step 01

Satellites take a snapshot

We pull high-resolution optical data from Sentinel-3 and NASA satellites every single day to capture the ocean's state.

Step 02

We process the data

Our algorithms process the raw data, analyzing chlorophyll density and turbidity to map out exact visibility zones.

Step 03

You see the viz

The processed clarity map feeds straight into VizCheck. You get an instant, easy-to-read clarity map on your phone.

NZ + AUS

Built for New Zealand and Australia

Experience high-definition chlorophyll & visibility data across the entire Australian and New Zealand coastline.

Australia
Australia
Live Coverage
New Zealand
New Zealand
Live Coverage

Tested by divers. Trusted by divers.

"I've been testing this for months and I can confidently say the data is spot on. I use it every time I go out."
Ellie Hayden Ellie Hayden
"Finally a viz app that actually works. Reliable, accurate, affordable, and dead simple to use."
Thierry Meier Thierry Meier
"VizCheck has become part of my diving routine. I check it before every session — no more wasted trips."
Matt Turner Matt Turner
FAQs

Got questions?
Here’s the answers.

What is chlorophyll?
Chlorophyll concentration is a direct indicator of phytoplankton abundance. Lower chlorophyll levels typically correlate with cleaner, bluer water and better visibility for diving and spearfishing.
How often is the data updated?
We update our maps daily. As soon as the Sentinel-2 and NASA satellites pass over your region, we process the optical data and update the app as soon as this is done. Depending on the satellite movements you get same-day data, and often times the data might be a day behind.
Can I view historic data?
Yes. You can go back in time and browse previous chlorophyll imagery to analyse how water clarity changes over days, weeks, and seasons. It's a great way to spot patterns at your favourite dive spots and plan your sessions around them.
How accurate is the satellite data?
Very accurate. We use high-resolution multispectral imagery with detailing as fine as 300m — meaning we can detect changes in water clarity every 300 meters. This is the highest resolution commercially available.
What happens on cloudy days?
Optical satellites cannot see through thick cloud cover. On cloudy days, data will be patchy or simply unavailable. Your best bet is to review the past few days, analyse how the water was moving, and use that to predict today's visibility.
Can I use it on my boat without signal?
You need internet access to use vizcheck.app. If you need the data offline, simply screenshot the area you plan to dive before heading out.
Can I cancel anytime?
Absolutely. On the monthly plan, you can cancel anytime and keep access until the end of your billing period. On the yearly plan, you'll have access for the remainder of the year you've paid for.
Does it work on iPhone/Android?
Yes. VizCheck is a web app, so it works on any phone or laptop and gives you a native app-like experience wherever you open it.

Know the visibility before you dive.

Trusted by spearos and freedivers across AU and NZ.

Try VizCheck