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Anchor & chain planner

How much chain? Exactly this much.

Snubber sizes your anchor chain for your boat, the depth and the forecast wind and gusts, with real catenary physics. And when your gear can't hold, it says so.

Open the web app See plans

Free, no account needed. iPhone and Android apps coming soon.

Snubber's plan: anchoring Kalia in 5 m of water on sand, wind 15 knots gusting 25. Verdict: holds in 25 knot gusts, 23 m of chain.

How it works

Three answers. One length of chain.

Set your boat up once. At each anchorage, tell Snubber what changed.

Your boat

Pick it from 2,900 production models, or enter your own figures. Chain, rope, anchor, bridle or snubber.

Where you drop

The depth, the tide still to come and the seabed: sand, mud, clay or rock and weed.

The forecast

The average wind and the gusts. Every check is made in the strongest gust, never the average.

The answer: the length to let out, anchor to bow, and a clear verdict: Holds in 25 kn gusts or Not equipped for this forecast

Features

Built on physics, not rules of thumb.

Stress-test the anchorage

Push the wind and the gusts and watch the chain lift off the seabed. Snubber shows the gust at which your anchor gives way, before the night does.

  • The chain's true catenary shape, in the gusts and in the average wind
  • The angle at the anchor and the breaking point
  • Change the chain or the depth and see the effect at once
The stress test: the chain drawn from the anchor to the bow in 5 m of water, the anchor giving way at 29 knots.

The forecast, filled in Premium

Premium reads the wind and gusts for where and when you anchor, from the best model that covers it, and keeps checking while you're there.

  • ECMWF and Météo-France models, side by side
  • Wind, gusts, waves, swell, rain, pressure and currents on the map
  • An anchor alarm that keeps watch all night on your phone
Snubber's forecast map: wind speeds in colour over Brittany and the Channel, with a time slider over the coming week.

Pricing

Free to plan. Premium for the forecast.

Everything that sizes your chain is free, for good. Premium brings the weather to you.

Free

€0forever

No account needed.

  • Chain length for your boat, depth, seabed, wind and gusts
  • Holds / Not equipped verdict, with the reasons
  • Stress test and breaking point
  • Chain, rope, bridles and snubbers
  • 2,900 boats and 40+ anchors to pick from
  • Logbook of your anchorages
  • Works offline
  • Backup and sync across deviceswith a free account
Start planning

Premium

Monthlyprice at launch

Needs an account. Cancel any time.

  • Everything in Free
  • Forecast wind and gusts filled infor your position and the length of your stay
  • Weather mapwind, gusts, waves, swell, rain, pressure, currents, with a time slider
  • Models comparedECMWF IFS and AIFS, Météo-France ARPEGE and AROME
  • Anchor alarmsounds when the boat drags out of its circle
  • Forecast-change alerts at anchorand how much more chain to let out
Log in

Subscriptions open with the iPhone and Android apps.

Honest by design

It tells you when it can't hold.

More chain doesn't fix everything. When the forecast is beyond your gear, Snubber says what fails and what would help, instead of a number that looks safe.

Not equipped for this forecast

  • The anchor drags in the gusts, even with all the chain out
  • The chain's pull goes over its working limit
  • There isn't enough chain aboard for this depth

Drop anchor with a number you trust.

Open Snubber in your browser now. Your boats stay on your device until you choose to sync them.

Open the web app Log in