# Tide Graph vs TZ iBoat

The clearest difference is price: TZ iBoat at Free against Tide Graph's $1.99. TZ iBoat also leads on update cadence (every 8 days vs every 6 weeks) and review sentiment (80% vs 70%). Tide Graph's advantage is device support (5 vs 3) and chart position (#24 vs #88). On rating, ratings volume, ads and in-app purchases there is nothing between them.

TZ iBoat is free to download; Tide Graph costs $1.99 up front. Tide Graph sells 11 one-off in-app purchases and TZ iBoat sells 13 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for Tide Graph against 4.6 for TZ iBoat. Both are backed by a comparable volume of ratings — 1.6K and 885 respectively. Written reviews are what separate them: 70% of Tide Graph's written reviews are positive against 80% of TZ iBoat's.

Tide Graph ships an update every 6 weeks, TZ iBoat every 8 days. Both last shipped on October 29, 2026.

## The numbers

| Metric | Tide Graph | TZ iBoat |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.8 (1.6K ratings)](https://appshunter.io/ios/app/tide-graph/id288420737/reviews)** | [4.6 (885 ratings)](https://appshunter.io/ios/app/tz-iboat-marine-navigation/id1312769833/reviews) |
| Number of ratings | **1.6K** | 885 |
| Positive reviews | 69.6% of reviews | **79.6% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 8 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | **#24** | #88 |
| Size | 30 MB | 428 MB |
| Requires iOS | **11.0** | 14.2 |
| Devices | **iPhone, iPad, iPod, Apple TV, Apple Watch** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Brainware LLC](https://appshunter.io/developer/288420740) | [Nobeltec, Inc.](https://appshunter.io/developer/1312769832) |

## What reviewers say

### Tide Graph

[App page](https://appshunter.io/ios/app/tide-graph/id288420737)

**Currently charting:** #24 Top Paid · Navigation (US App Store)

This app provides interactive tide graphs with over 10 billion predictions for US coastal stations. It also displays sunrise, sunset, moonrise, moonset, and moon phases. Save locations and graphs for easy access.

**Highlights:** Interactive tide graphs, Sunrise, sunset, moonrise, moonset tracking, Moon phase display, Save recent locations, GPS location finder, Save graphs for later

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 2015 Tides and Currents | $0.99 | one-time |
| 2016 Tides and Currents | $0.99 | one-time |
| 2017 Tides and Currents | $0.99 | one-time |
| 2018 Tides and Currents | $0.99 | one-time |
| 2019 Tides and Currents | $0.99 | one-time |
| 2020 Tides and Currents | $0.99 | one-time |
| 2021 Tides and Currents | $0.99 | one-time |
| 2022 Tides and Currents | $0.99 | one-time |
| 2023 Tides and Currents | $0.99 | one-time |
| 2024 Tides and Currents | $0.99 | one-time |
| 2026 Tides and Currents | $0.99 | one-time |

**What reviewers like**

- ⭐ Accurate tide data
- 📊 Excellent visual representation of tides
- 🗓️ Detailed tide information including moon phases
- 🔍 Reliable for many locations
- 💰 Good value for the price

**What reviewers complain about**

- 🌐 Requires internet connection to function
- 🗺️ Limited to US and Alaska locations only
- 🔍 Difficult to find desired location
- 🕰️ Slow loading times in some cases
- 🔧 Compatibility issues with newer devices

**Reported bugs**

- Tide data inaccuracies reported in some locations
- Crashes and freezes when switching between stations
- Date/time display issues in certain cases

**Requested features**

- Offline mode for tide data
- Ability to save favorite locations
- Larger tide graph for better visibility
- Option to switch between metric and imperial units
- Automatic updates to latest tide information


### TZ iBoat

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

**Currently charting:** #88 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 (13)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Essential Subscription | $2.99 | per month |
| Premium Subscription | $9.99 | per month |
| Great Lakes | $19.99 | per year |
| Canada East and North | $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 |
| Western Mediterranean | $40.99 | per year |
| Eastern Mediterranean | $61.99 | per year |
| 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 Tide Graph free?

Tide Graph costs $1.99, and also offers in-app purchases.

### Is TZ iBoat free?

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

### Which has better reviews, Tide Graph or TZ iBoat?

Tide Graph is rated higher. Tide Graph averages 4.8 out of 5 from 1.6K ratings, while TZ iBoat averages 4.6 from 885 ratings.

### Do Tide Graph or TZ iBoat have ads?

Neither Tide Graph nor TZ iBoat shows ads.

### Which is updated more often, Tide Graph or TZ iBoat?

Tide Graph ships an update every 6 weeks, and TZ iBoat every 8 days. Most recently, Tide Graph was updated on October 29, 2026 and TZ iBoat on October 29, 2026.

### Which is more popular, Tide Graph or TZ iBoat?

Tide Graph currently peaks at #24 in the App Store charts, and TZ iBoat at #88. Chart position reflects recent download velocity rather than total install base.

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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.*