Iberian Atlantic coast

Know the slack window
before you go.

Viz, current, water temp, and slack timing — hour-by-hour, scored for spearfishing, freediving, and scuba. Stop driving to the coast to find milky water.

Free during beta · Early access for waitlist

Today · 19 Apr · Live

Three spots. Viz first, everything else in context.

Get this for your spots

View 24-hour forecast

Scores refresh every 15 minutes · Model: Slacktide v0.4 · Sources: ECMWF, NOAA WW3, Instituto Hidrográfico

How it works

Three decisions the model makes for you.

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.

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.

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.

Waitlist · Phase 0

Join the Slacktide waitlist.

We're opening the Iberian Atlantic coast first. Tell us where you dive — we'll let you in when we launch there.

Know the slack windowbefore you go.

Three spots. Viz first, everything else in context.

Three decisions the model makes for you.

Join the Slacktide waitlist.

Know the slack window
before you go.