Best Anchor Alarm Apps for iPhone (2026 Comparison)
Choosing the right anchor alarm app can mean the difference between a peaceful night at anchor and a dangerous situation. We compared the anchor watch apps worth considering in 2026 — including the one people search for that turns out not to be an anchor alarm at all.
We make one of these. Safety Anchor Alarm is ours, and it is marked as ours below rather than quietly placed first. We earn nothing if you download any of the others, and each entry lists what the app is called in the App Store, because several of them are easier to find by their listing name than by their brand. Prices and features last checked in August 2026 — store listings change, so confirm before you buy.
What to Look for in an Anchor Alarm App
Before diving into individual apps, here are the essential features every good anchor alarm should have:
- Reliable background GPS — the app must continue tracking when the screen is off and the phone is locked
- Loud, persistent alarm — it needs to wake you from sleep, not just show a notification
- Adjustable safe radius — different anchorages need different alarm distances
- Low battery consumption — it needs to run all night without killing your phone
- Simple, quick setup — when you're tired after a day of sailing, you don't want to fight with complicated settings
The Best Anchor Alarm Apps Compared
Safety Anchor Alarm
Pros
- Free to download — core alarm features included
- Background GPS monitoring with the screen locked
- Apple Watch alerts by sound and haptic
- Lock screen widget and Dynamic Island
- Night mode
- Anchor points library
- Anchoring calculators
- Configurable update intervals
Cons
- iOS only — no Android
- Newer app, so a smaller user base than the long-established options
- Some features require premium
Verdict: Ours, so weigh it accordingly. The case for it is a genuinely usable free tier, an Apple Watch alert that reaches a sleeping crew, and no account to create. The case against it is the smallest user base here.
Download Safety Anchor Alarm — FreeAnkeralarm
Pros
- Large anchorage database
- Cross-platform — the main option if anyone aboard is on Android
- Community features
- Remote monitoring (Pro)
Cons
- Pro features require a subscription
- More to learn than a single-purpose alarm
Verdict: The established all-rounder, and the one to pick if you need Android. Search the store for its listing name rather than the brand.
Anchor Alert (PredictWind)
Pros
- Weather integration
- NMEA 2000 instrument data
- AIS target display
- Backed by PredictWind
Cons
- Full features require DataHub hardware
- More than most people need for anchor monitoring alone
Verdict: Makes sense if you are already in the PredictWind ecosystem with N2K instruments. Overkill if you only want an alarm.
Anchor Pro
Pros
- Apple Watch support
- Telegram alerts to crew
- Simple, single-purpose interface
Cons
- Paid up front with no free tier
- iOS only
Verdict: A clean, single-purpose alarm with a useful trick: Telegram alerts, so a crew member ashore or in another cabin gets the message too.
Navionics Boating
Pros
- Excellent charts — the reason to have it
Cons
- It is not an anchor alarm and does not have one
Verdict: Listed only because so many people search for a Navionics anchor alarm. The Boating app does not have one — the “Anchor Drag” alarm people remember belongs to Garmin chartplotters, not the phone app. Use it for charts, and run an alarm alongside it.
Phone App vs. Chartplotter Anchor Alarm
Many chartplotters (Garmin, Raymarine, B&G) have built-in anchor alarm features. How do they compare to phone apps?
- Phone apps are louder — your phone is typically in the cabin with you, while the chartplotter is at the helm. A phone alarm is more likely to wake you.
- Phone apps are more portable — you can take the alarm ashore if you dinghy to a restaurant.
- Chartplotters have better GPS — external GPS antennas on chartplotters are generally more accurate than phone GPS.
- Phone apps don't drain boat batteries — no need to leave the chartplotter and instruments running all night.
The best approach is to use both: set the chartplotter alarm as a backup and rely on a phone app as your primary alert.
Tips for Using Any Anchor Alarm App
These tips apply regardless of which app you choose. For a complete guide on overnight anchoring, including alarm setup, see our dedicated article.
- Keep your phone plugged in. GPS tracking drains battery. Plug in to a USB charger for overnight use.
- Set the right radius. Too tight and you'll get false alarms from normal boat swinging. Too wide and you won't be alerted early enough. Start with 40-50 meters for a typical anchorage.
- Wait for the anchor to set. Don't activate the alarm immediately after dropping anchor. Let the boat settle on the hook first, then set your alarm position.
- Test the alarm sound. Make sure the volume is up and the alarm is loud enough to wake you. Some phones have Do Not Disturb modes that can silence alarms.
- Use it alongside good seamanship. An app is a tool, not a substitute for proper anchoring technique, adequate scope, and awareness of conditions. Learn what causes anchors to drag so you can prevent it.
Our Recommendation
For most sailors, Safety Anchor Alarm offers the best combination of features and value. It's free to download with core alarm features included, plus extras like a lock screen widget, night mode, and anchor points library. Optional premium features are available through an affordable in-app subscription.
If you need cross-platform support (Android), Ankeralarm is a solid choice. If you're already invested in the PredictWind ecosystem with NMEA 2000 instruments, Anchor Alert integrates beautifully with that setup.
Regardless of which app you choose, the most important thing is to actually use one. Too many sailors skip the anchor alarm and rely on hoping for the best. A simple app on your phone could save your boat, your safety, and your peace of mind.
Frequently Asked Questions
What is the best free anchor alarm app for iPhone?
Do anchor alarm apps work with the screen locked?
Are anchor alarm apps reliable enough for overnight use?
Do I need internet for an anchor alarm app to work?
Try Safety Anchor Alarm Free
Free to download. Core alarm features included. Optional premium for advanced tools.
Download for iOS