HoldFast Anchor Alarm
Anchor drag alarm for sailors
Free · In‑App Purchases
Now with Critical Alerts: HoldFast's drag alarm sounds even when your phone is on silent or in Sleep Focus, so you'll know the moment your anchor starts to drag.
Anchor with confidence — and actually sleep.
HoldFast keeps a constant GPS watch on your boat and sounds a loud alarm the instant it starts to drag — even with the screen off. The core anchor alarm is free, built by sailors for sailors.
SET IT. FORGET IT. SLEEP.
• Drop anchor — tap your position, or offset to the exact bow location
• Set your swing — adjust the watch radius from 5m to 200m
• Rest easy — HoldFast keeps watch in the background while you sleep
TRUSTED ANCHOR MONITORING — FREE
ROCK-SOLID BACKGROUND TRACKING — An optimized GPS engine stays awake with the screen off. If your boat moves, you'll know.
NO FALSE ALARMS — You set the GPS-signal-loss threshold, from 30 seconds to several minutes. No more 3 AM "ghost" alerts.
PROGRESSIVE ALARMS — A gentle nudge as you near the boundary, then a loud emergency alarm if you've truly broken free. You're warned early, not too late.
NIGHT-VISION DARK MODE — Keeps your cockpit dark and your night vision intact.
HOLDFAST PREMIUM
Unlock the extras when you're ready — choose an annual plan, or pay once for lifetime access.
CUSTOM ALARM ZONES — Draw a shape around rocks, shallows, or moorings instead of a plain circle.
REMOTE WATCH — Share a private live link so family or crew ashore can track your position in real time from any web browser.
GPS TRACK HISTORY — Replay exactly how your boat swung through the night on a colour-coded track.
CUSTOM ALARM TONES — Choose a piercing tone that's guaranteed to wake you.
PRIVATE BY DESIGN
No account to create. No data collection. No internet required for core alarm functions — the watch runs entirely on your device.
Download HoldFast and take the stress out of the anchorage.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
• Critical Alerts: the drag alarm now sounds even when your phone is on silent or in a Focus mode. Allow Critical Alerts when prompted, or turn them on in Settings → HoldFast → Notifications.
• Fewer false alarms: low-accuracy GPS readings are ignored, the alarm waits for a confirmed reading before sounding, and it no longer flickers on and off when you're sitting right at the edge of your swing circle.
• Alarm notifications are more reliable while HoldFast is in the background.
• Settings now shows your app version and build number.
Fair winds and secure holding. Thanks for using HoldFast!
The developer, Adam Harvey, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Adam Harvey
- Size
- 48.6 MB
- Category
- Navigation
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPad
Requires iPadOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later.
- iPhone
- Location
- This app may use your location even when it isn’t open, which can decrease device battery life.
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- HoldFast Anchor Alarm $9.99
- HoldFast Premium $4.99
- Copyright
- © 2026 Adam Harvey