For iPhone and Apple Watch
Know the water before you get in
Saltglass reads the sea at your spot every fifteen minutes and tells you, in one line, whether this morning is a good one to swim.
Free to use. Android in beta.See what it does
At a glance
One look, then in you go
Widgets on your home screen and your wrist: the verdict and your swim window, the water, the waves and the tide, without opening anything.
Gull Rock · Wrenmouth
Good to swim
Calm and clear until about ten, then the wind turns onshore and the chop builds.
Swim window07:10–09:40
Water
14.2°C
+0.6° since Sunday
Waves
0.4m
9 s period, from the south-west
Tide
High 08:52 · Low 15:07
Wind
11km/h
Offshore until 10:00
Air
12°C
Feels like 10°, sunrise 07:18
What it does
Made for the cold, early, honest swim
Not a surf app with swimming bolted on. Every screen answers a question you ask on the shingle at seven in the morning.
One line, every morning
The swim verdict
Saltglass turns the buoy, the wind and the tide into one line, good to swim, think twice or stay on the stones, and the window of hours that works.
The morning, laid out
Hour by hour
Waves, wind and water temperature for every hour of the next seven days, with the good hours marked, so you can plan the swim before you set the alarm.
Someone always knows
Check-ins
Start a check-in before you go in. If you're not out by the time you set, your buddy gets a text with your spot and when you went in.
How it works
From the buoy to your pocket
Three steps, every fifteen minutes, for every spot in the app.
We read four sources
The nearest wave buoy, two weather models and the tide tables, checked against each other so one bad reading can't fool the forecast.
We read them for swimmers
Surf apps love big waves; we don't. Saltglass scores wind direction, chop, swell period and water temperature the way a cautious swimmer would.
You get one line
Good to swim, think twice or stay on the stones, with the hours that work. The numbers are one tap away if you want them.
Pricing
Free for the morning dip
Everything you need for one spot is free. Pro adds every spot, the hour-by-hour forecast and check-ins.
Free
Your home spot, every morning.
€0/month
- One spot
- The verdict and swim window
- Water, waves, wind and tide
- Widgets
Pro
Most swimmersEvery spot, every hour, and someone looking out for you.
€4.99/month
- Every spot on the coast
- Hour-by-hour forecast for 7 days
- Buddy check-ins
- Swim log and seasons
- Apple Watch app
Clubs
For swim clubs, coaches and sea-swim events.
Let's talk
- Pro for every member
- Shared check-ins for group swims
- Your club's spots and safety notes
- A page for your sessions
- between updates
- 15 min
- sources behind every reading
- 4
- spots on the Wrenmouth coast
- 212
- ads or trackers
- 0
How Saltglass works, autumn 2026
The journal
Notes from the shore
Why the swell period matters more than the wave height
A 0.4 metre wave can be a ripple or a shove. The number that tells you which is the period, and it's the one most swimmers skip.
Forecasts
When an onshore wind says no
Wind blowing onto the beach builds chop fast and pushes you back towards the wall. How we read it, and when we stay on the stones.
Forecasts · Safety
Your first cold minute
The gasp, the racing breath and why the first sixty seconds in cold water are the ones to plan for.
Cold water · Safety
The sea's ready when you are
Download Saltglass, pick your spot and set an alarm. Tomorrow morning you'll know before you've found your cap.
On Android? Join the beta