Know your boat is holding.
A precise anchor watch that sounds the alarm the moment you start to drag, and lets a second phone or a laptop ashore watch the boat with you. Works with the GPS you already have.
No login, no subscription. Share a QR code to watch from any device.
Everything you need to anchor with confidence
Built with sailors, for real anchorages. The details that matter when the wind picks up at 3am.
Drag alarm that wakes you
A loud alarm on the phone plus push notifications the instant the boat leaves the safe zone, even with the app closed.
Watch from anywhere
Leave one phone on the boat and keep an eye from a second phone or a laptop ashore. No shared account, just a QR code.
Many sources, always the best fix
Connect phone GPS, a Bluetooth receiver, your chartplotter over NMEA and Signal K at the same time. It auto-selects the most accurate fix and falls back instantly if one drops, for better accuracy and real redundancy.
Built for every anchorage
Free swing, mooring buoy, restricted room, bow and stern lines, or a Bahamian moor. Pick the type and set the zone.
See every swing
A live swing view and a 24 hour track show holding from dragging at a glance, so a normal swing never fools you.
Free to use
The full anchor watch with no account and no sign up. Open it, drop the hook, and you are watching in seconds.
An anchor watch should be simple, and free
We were tired of anchor alarms that took ages to set up, hid behind a subscription, or only alerted through a Telegram bot you had to wire up yourself. And nearly all of them assumed every phone was signed into the same account. So we built the one we wanted on our own boats.
Easy from the first night
Drop the anchor and arm the watch in seconds. No manual to read and no fiddly configuration before you can trust it.
Free, no strings
The full watch with no subscription and no account. The best anchor alarm should not be the one stuck behind a paywall.
No Telegram, no bots
A loud alarm on the phone and real push notifications are built in. Nothing to wire up through Telegram, IFTTT, or a third-party service.
Different accounts welcome
Watch from a friend's phone or a laptop ashore without sharing a login. A short code links any devices, each on its own account or none at all.
From the phone in your pocket to the helm
Phone and tablet GPS, an external Bluetooth receiver, NMEA 0183 over the network from a Garmin, B&G or Raymarine plotter, or Signal K from a Victron Cerbo. Connect several at once and Auto mode always uses the most accurate live source, with instant fallback for redundancy.
Set an anchor in seconds,
sleep easy all night
Drop the anchor at your position, set the swing radius from depth and rode, and arm the watch. The track records your swing so you can tell a wind shift from a dragging anchor at a glance.
Sailors are sleeping better
What crews say after a season at anchor with Anchor Alarm Pro.
"Dropped the hook in a crowded bay and slept like a baby. The night we did move, the drag alarm had us up and sorted in seconds."
"I run it on an old phone at the helm and watch from my bunk on my own phone. The bow and stern corridor is perfect for our Med mooring."
"Connected my chartplotter GPS over the boat network and the accuracy is excellent. Best free anchor watch I have used, full stop."
"What sold me is handing the watch off mid-anchorage. We left the boat for dinner ashore and just kept it running on my phone, the alarm stayed armed the whole evening."
Anchoring know-how from the crew
5 Best Anchor Alarm Apps for 2026
We compared the most popular anchor watch apps for iPhone and Android on price, platforms, multi-device monitoring and GPS.
10 Anchoring Tips for a Better Hold
Scope, setting technique, snubbers, swing room and the habits that keep you put through the night.
How to Choose the Right Anchor for Your Boat
New-generation scoop anchors vs the classics, sizing for your boat, and matching the anchor to the seabed.
Use Your NMEA GPS as an Anchor Alarm
Why your chartplotter's fix beats a phone, and how to feed NMEA or Signal K into a precise anchor watch.
Your first anchor watch in about a minute
Free, no account. Put it on your phone or tablet, or just open it in a browser.
On your phone
Install for iPhone or Android, drop your anchor, set how far the boat may swing, and you are on watch.
On a tablet
The same app on iPad or an Android tablet makes a great always-on anchor watch at the nav station.
On your laptop
No install needed. Open it in any browser to keep an eye on the boat from ashore.
Link a second device by scanning a QR code or sharing a 6-character code. No account, no login.