Comparison

Anchor Sentry vs Ankerwache Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Anchor Sentry

This app monitors your ship's position while anchored, alerting you if the anchor drags and the vessel moves outside a set perimeter. It offers advanced features like distance circles, prohibited zone alerts, and background operation for continuous monitoring.

Highlights
  • Anchor drag and perimeter breach alerts
  • Map display with Google Maps or Navionics
  • Prohibited zone setup with alerts
  • Background operation
  • Multi-device sync functionality
  • GPX track saving
  • Favorite anchoring place saving
Read full description

Anchor Sentry is an app to monitor the ship's position at anchor and inform the skipper when the anchor is dragging and thus the ship leaves the setup perimeter. Features: - Show current position on GoogleMaps map or Navionics map (To gain access to Navionics maps from this application, users with an active Navionics subscription in the Navionics Boating application must register with their Navionics credentials) - Distance circles to help finding a good anchor position - Drop anchor by tapping on map or by position or by bearing and distance - Can be used for anchoring with shore lines by watching the heading rather than the position - Tracks can be saves as GPX file for later processing - Option to set up prohibited zones which will trigger an alert when entered. These can be used indepent of the anchor state - Runs in the background even while other apps are used - Unique sync functionality which allows to pair two or more devices together to see the ships position even while out to shore for dinner - Barograph function included - Display real echo sounder data from a providing NMEA server - Optional compass overlay to help finding the bearing to the anchor - Option to show current position visible to friends and family on the Anchor Sentry website - Proximity alert between ships both using Anchor Sentry. To get warned when your neighbours anchor is dragging. - Automatic anchoring feature - Display maximum swinging circle - Save favorite anchoring places with pictures - Several setup options to customize your app

About

Ankerwache Pro

This app provides a reliable anchor alarm and management system for recreational boaters. It monitors your position to alert you of drift, allowing for safe nights at anchor. You can also save, share, and discover anchorages with other users.

Highlights
  • Reliable anchor alarm with drift detection
  • Save and manage anchorages with details
  • Rate, share, and discover anchorages
  • Mirror mode for multi-device monitoring
  • Apple Watch app for wrist alerts
  • Live status on Lock Screen and Dynamic Island
Features
Read full description

The anchor alarm for skippers and crew. This app combines an anchor alarm with anchor management in a simple and intuitive solution for recreational boats. Hi! I’m Frank – sailor, developer, and technology enthusiast. For over 25 years, I’ve spent my time both on the water and in front of a screen. From this experience, an anchor alarm was created that truly supports skippers and crews in everyday use – reliable, clear, and without unnecessary complexity. The idea: a practical app for recreational boats that helps you keep track of your anchorages and increases safety on board. No overloaded feature set, no complicated menus – just what you really need when anchoring. The anchor alarm supports you during your anchoring experience: • Safe nights at anchor: The anchor alarm monitors your position and reliably warns you in case of drift. • Mirror mode: Monitor the anchor alarm simultaneously on multiple devices. • Apple Watch app: Anchor status and alarms directly on your wrist. • Live status: Active anchor alarm visible on the Lock Screen and in the Dynamic Island. • Save and manage anchorages: With additional information such as water depth or special experiences. • Rate, share, and discover anchorages: Exchange experiences with other skippers. Let’s make anchoring safer and smarter together. Thank you for taking a look at my anchor alarm – I wish you many safe and unforgettable moments on the water! Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.ankerwache.info/datenschutzerklarung/

Screenshots

Anchor Sentry3 screens
Ankerwache Pro4 screens

Verdict

The call

The clearest difference is price: Ankerwache Pro at Free against Anchor Sentry's $3.99. Ankerwache Pro also leads on review sentiment (100% vs 73%) and update cadence (every 6 days vs every 3 weeks). Anchor Sentry's advantage is in-app purchases (none vs 2) and iOS requirement (15 vs 17.6). On ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Ankerwache Pro is free to download; Anchor Sentry costs $3.99 up front. Ankerwache Pro sells 2 in-app purchases, starting at $8.99 per year. Anchor Sentry asks for nothing beyond the download.

UpkeepUpdate frequency

Anchor Sentry ships an update every 3 weeks, Ankerwache Pro every 6 days. The most recent releases landed on October 26, 2026 and October 16, 2026 respectively.

Scorecard6 real differences · 4 level
Anchor Sentry versus Ankerwache Pro: the parameters behind the verdict, then further details
ParameterAnchor SentryAnkerwache Pro
Price$3.99Free — better
Rating4.0 (4 ratings) — better—
Positive reviews73.3% of reviews100.0% of reviews — better
Number of ratings4 — better—
Update frequencyEvery 3 weeksEvery 6 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15 — better17.6
Further details — not scored
Size91 MB29 MB
Age rating4+4+
DeveloperMichael Dieter KonzFrank Urbanowitz

Customer experience

Anchor Sentry

All ratings4 ratings
Positive50.0%
Neutral50.0%
Negative0.0%
Written reviews15 reviews
Positive73.3%
Neutral13.3%
Negative13.3%

Ankerwache Pro

Written reviews3 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Anchor Sentry

No in-app purchases

2 purchases

Ankerwache Pro

Subscriptions1
  • Yearly$8.991 Year
One-time1
  • Buy$17.99

Questions

Is Anchor Sentry free?
Anchor Sentry costs $3.99, with no in-app purchases.
Is Ankerwache Pro free?
Ankerwache Pro is free to download, with in-app purchases available.
Do Anchor Sentry or Ankerwache Pro have ads?
Neither Anchor Sentry nor Ankerwache Pro shows ads.
Which is updated more often, Anchor Sentry or Ankerwache Pro?
Anchor Sentry ships an update every 3 weeks, and Ankerwache Pro every 6 days. Most recently, Anchor Sentry was updated on October 26, 2026 and Ankerwache Pro on October 16, 2026.

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