# DriftWatch vs TZ iBoat

The clearest difference is update cadence: TZ iBoat at every 8 days against DriftWatch's every 12 months. TZ iBoat also leads on review sentiment (79% vs 67%) and chart position (#96 vs unranked). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. DriftWatch sells 3 in-app purchases, starting at $3.99 per year and TZ iBoat sells 10 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

DriftWatch ships an update every 12 months, TZ iBoat every 8 days. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | DriftWatch | TZ iBoat |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (886 ratings)](https://appshunter.io/ios/app/tz-iboat-marine-navigation/id1312769833/reviews)** |
| Number of ratings | — | **886** |
| Positive reviews | 66.7% of reviews | **79.4% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 8 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | — | **#96** |
| Size | 85 MB | 428 MB |
| Requires iOS | 17.4 | **14.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Rene Dacier](https://appshunter.io/developer/1001235750) | [Nobeltec, Inc.](https://appshunter.io/developer/1312769832) |

## What reviewers say

### DriftWatch

[App page](https://appshunter.io/ios/app/driftwatch/id1001235751)

This navigation app helps boat captains sleep soundly by monitoring anchor drift. It uses your device's GPS to alert you if your vessel moves outside a set boundary, providing peace of mind while at anchor.

**Highlights:** Anchor drift monitoring, GPS boundary alerts, Audible alarms, Battery level monitoring, Simple and easy to use

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Time Limit | $3.99 | per year |
| 24H Wind Forecast | $9.99 | per year |
| 24H Wind Forecast. | $9.99 | per year |


### TZ iBoat

[App page](https://appshunter.io/ios/app/tz-iboat-marine-navigation/id1312769833)

**Currently charting:** #96 Top Grossing · Navigation (US App Store)

Navigate the seas with advanced marine charts, GPS, and AIS data, even offline. This app offers detailed bathymetry, community-contributed map data, and dynamic features for safe boating, sailing, and fishing.

**Highlights:** Offline marine charts, GPS and route planning, AIS Online tracking, Community map contributions, Dynamic mooring and lighting, Advanced fishing tools, Tides and tidal currents

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Essential Subscription | $2.99 | per month |
| Premium Subscription | $9.99 | per month |
| Great Lakes | $19.99 | per year |
| Canada West | $19.99 | per year |
| USA | $19.99 | per year |
| Bahamas | $30.99 | per year |
| Central America & Caribbean | $30.99 | per year |
| Elite Subscription | $39.99 | per month |
| AIS module | $8.99 | one-time |
| Radar module | $49.99 | one-time |

**What reviewers like**

- 🚀 Easy to use
- 🚀 Accurate charts
- 🚀 Useful features (weather, tides, currents, etc.)
- 🚀 Good integration with Furuno radar and AIS
- 🚀 Seamless cloud sync between devices

**What reviewers complain about**

- 🐛 Occasional crashes or freezing
- 🐛 Inaccurate or outdated charts in some areas
- 🐛 Anchor alarm not loud enough
- 🐛 Difficulty importing/managing routes and waypoints
- 🔋 Battery drain on mobile devices

**Reported bugs**

- GPS position not updating reliably while moving
- Radar overlay not functioning properly
- Compatibility issues with older devices or iOS versions

**Requested features**

- Automatic routing and trip planning
- Improved satellite imagery and overlays
- Better integration with other marine electronics
- More customization options for data displays
- Ability to mirror camera feeds as a rear-view


## Frequently asked questions

### Is DriftWatch free?

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

### Is TZ iBoat free?

TZ iBoat is free to download, with in-app purchases available.

### Do DriftWatch or TZ iBoat have ads?

Neither DriftWatch nor TZ iBoat shows ads.

### Which is updated more often, DriftWatch or TZ iBoat?

DriftWatch ships an update every 12 months, and TZ iBoat every 8 days. Most recently, DriftWatch was updated on November 1, 2026 and TZ iBoat on November 4, 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.*