# Mark Time vs Anchor Alert

The clearest difference is review sentiment: Mark Time at 100% against Anchor Alert's 64%. Mark Time also leads on in-app purchases (none vs 3) and rating (5.0 vs 4.7). Anchor Alert's advantage is update cadence (fortnightly vs every 34 months) and ratings volume (12 vs 3). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Anchor Alert sells 3 in-app purchases, starting at $15.00 per month. Mark Time asks for nothing beyond the download.

Mark Time holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 3 and 12 respectively. Written reviews point the same way: 100% of Mark Time's written reviews are positive against 64% of Anchor Alert's.

Mark Time ships an update every 34 months, Anchor Alert fortnightly. The most recent releases landed on October 9, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Mark Time | Anchor Alert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/mark-time/id1305580742/reviews)** | [4.7 (12 ratings)](https://appshunter.io/ios/app/anchor-alert/id1628786449/reviews) |
| Number of ratings | 3 | **12** |
| Positive reviews | **100.0% of reviews** | 63.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 34 months | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 1 MB | 174 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TrozWare](https://appshunter.io/developer/477909805) | [PredictWind Limited](https://appshunter.io/developer/477048590) |

## What reviewers say

### Mark Time

[App page](https://appshunter.io/ios/app/mark-time/id1305580742)

This app helps celestial navigators accurately record UTC time for sextant sightings. It provides tactile and auditory feedback for precise time stamping, storing readings in five registers. Users can optionally photograph their sextant for later verification.

**Highlights:** Accurate UTC time recording, Five time registers, Auditory and vibration feedback, Optional sextant photo capture, Configurable settings, Latitude and longitude verification

**In-app purchases:** none


### Anchor Alert

[App page](https://appshunter.io/ios/app/anchor-alert/id1628786449)

Monitor your boat's position and anchor status from anywhere. Set custom alerts for real-time and forecast conditions, and access detailed marine weather forecasts. Connects to your boat's N2K network or works independently.

**Highlights:** Anchor and boat position monitoring, Customizable real-time and forecast alerts, N2K DataHub integration, PredictWind marine weather forecasts, Local anchorage knowledge and reviews, Works on and off the boat

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Anchor Pro 1 monthly | $15.00 | per month |
| Anchor Pro 3 monthly | $29.00 | per 3 months |
| Anchor Pro Yearly | $99.00 | per year |


## Frequently asked questions

### Is Mark Time free?

Mark Time is free to download, with no in-app purchases.

### Is Anchor Alert free?

Anchor Alert is free to download, with in-app purchases available.

### Which has better reviews, Mark Time or Anchor Alert?

Mark Time is rated higher. Mark Time averages 5.0 out of 5 from 3 ratings, while Anchor Alert averages 4.7 from 12 ratings.

### Do Mark Time or Anchor Alert have ads?

Neither Mark Time nor Anchor Alert shows ads.

### Which is updated more often, Mark Time or Anchor Alert?

Mark Time ships an update every 34 months, and Anchor Alert fortnightly. Most recently, Mark Time was updated on October 9, 2026 and Anchor Alert on October 19, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*