Your coast
Try your spot.
Type any coastal place and we’ll show a 3-day conditions preview. No signup required.
Today · Live
Three spots. Viz first, everything else in context.
ALGARVE, PORTUGAL
updated 14m agoSagres
Reef·6–18m·shore
Visibility
9.0mClean→
Spear score
73/100Best window
08:00 – 10:00Water
17.5°CView 24-hour forecast
CALIFORNIA, USA
updated 14m agoSanta Cruz
Kelp·8–20m·shore
Visibility
9.0mClean→
Spear score
88/100Best window
03:00 – 05:00Water
18.4°CView 24-hour forecast
SOUTH SINAI, EGYPT
updated 14m agoDahab
Reef·5–25m·shore
Visibility
2.0mMilky→
Spear score
78/100Best window
15:00 – 17:00Water
26.3°CView 24-hour forecast
Scores refresh every 15 minutes · Model: Slacktide v0.4 · Sources: Open-Meteo marine + weather forecast
How it works
Three decisions the model makes for you.
01
Pick your spots and discipline
Save the coastline you dive — mark each site as reef, wall, kelp, wreck, or shore. Tell us whether you're spearing, freediving, or on scuba. Scoring adjusts.
02
We model viz, current, and column temp hourly
Swell period, runoff, river plumes, pressure, and moon feed a per-hour viz forecast. Current and thermocline come from tide model + buoys.
03
Pings only when a window opens
Push or Telegram when viz, current, and surface line up for your discipline and depth range. No daily digest. No surf hype.