Tide Graph vs TZ iBoat
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tide Graph
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.
- Interactive tide graphs
- Sunrise, sunset, moonrise, moonset tracking
- Moon phase display
- Save recent locations
- GPS location finder
- Save graphs for later
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- Provided over 10 billion predictions - Supports iOS 11+, Watch OS 4.3+, iPhone 7+ Tide Graph uses the harmonic predictions from thousands of US coastal stations and presents them in a fun and interactive graph. And now, in version 2.0 you also get an intuitive graph that shows sunrise, sunset, moonrise, moonset, and moon phase at a glance. Save recent locations, find locations using GPS location, and save graphs for later. Tides have a great influence on the lives of boaters, fishermen, surfers, coastal communities, marine life, and vacationers just to name a few. Directly or indirectly, the great flow of our massive ocean bodies of water impact the daily lives of everyone on this planet. The cyclical movement of the Earth's tides are caused by a combination of the gravitational forces of the sun and moon as well as the shape of the costal region. Unlike simple tide clocks that you can buy in novelty stores, more accurate tide predictions use special data gathered by instruments located at each tide station. The data from these measurements are used to determine the harmonic components which then feed into the mathematical algorithms which predict tides for the future. The end results are tested for accuracy and adjustments are made as necessary. Tide Graph has US owned Tide Stations Only. An internet connection is required to get the latest tide graph. - See TideGraph.com for a complete list of stations.
TZ iBoat
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.
- Offline marine charts
- GPS and route planning
- AIS Online tracking
- Community map contributions
- Dynamic mooring and lighting
- Advanced fishing tools
- Tides and tidal currents
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Your next-generation chartplotter. Navigate with the world’s #1 marine charts app for coastal boating, sailing, and fishing. Marine GPS, nautical charts, AIS Online, tides & tidal currents, anchoring, marine weather, radar, sounder, and NMEA data — everything you need for safer navigation at sea. Built for sailors, boaters, and fishermen who need reliable navigation anywhere, online or offline. THE SMARTEST AND CLEAREST NAVIGATION INTERFACE AT SEA A cutting-edge interface makes navigation clearer and faster: • TZ Bar: quick access to key features • Dedicated screens: Weather, Fishing, NavData, Logbook, Mooring, Tides, Sounder • Cleaner chart view, easier to read • Customizable interface for faster access • Modern design focused on readability WHAT YOU CAN DO WITH TZ iBoat • Navigate with marine GPS and nautical charts • Monitor AIS targets locally and globally • Plan routes and anchor safely • Access tides, currents, and weather forecasts • Fish smarter using oceanographic data FOR SAILORS & BOATERS – Navigate safely • TZ MAPS: vector, raster, satellite, and bathymetry charts • SMART SEARCH: find marinas, buoys, tide stations, routes • DYNAMIC LIGHTS: real-time light sectors • DYNAMIC MOORINGS: wind-aware anchorage • Precise GPS for coastal navigation AIS & SAFETY – Stay aware beyond your horizon • AIS ONLINE: global AIS targets via internet (Essential plan) • Share AIS data with the community • Radar and onboard instrument integration • Real-time traffic awareness for safer navigation FOR FISHERMEN – Gain the edge Turn ocean data into real fishing results: • Identify productive zones using SST, chlorophyll, currents, altimetry (Elite plan) • Spot fish-holding conditions faster • BATHYVISION: high-resolution bathymetry with contour lines • Target high-potential areas with precision • EVENT & CATCH: log and analyze catches on nautical charts WEATHER – Clearer and more useful • Dedicated Weather screen • Real-time forecasts and offline access • Rain Radar with lightning data • High-resolution models available in Premium plan • Iridium GO! compatibility CONNECTIVITY & PRECISION • NMEA connectivity: manage and prioritize data sources • Connect AIS, radar, autopilot, and instruments • Latitude/longitude keyboard optimized for use at sea • Easy coordinate entry with multiple formats COMMUNITY & ECOSYSTEM • COMMUNITY MAPS: share local knowledge (hazards, POIs, marinas) • Contribute and improve charts • Trusted by 500,000+ boaters worldwide SUBSCRIPTION PLANS Choose the plan that fits your needs: • Essential: AIS Online, onboard instruments, autopilot integration via Wi-Fi NMEA • Premium: Essential + high-resolution forecasts, Rain Radar, multiple models, comparison • Elite: Premium + ocean layers (SST, Chlorophyll, SSH, Currents). Monthly and annual plans available, with savings on yearly options. Core features remain available for free. CHARTS AND DATA PLANS SUBSCRIPTIONS: The payment will be debited from the Apple account once the purchase is confirmed. The subscriptions and automatic renewals can be managed by entering the account settings after making the purchase. Any unused part of a free trial period, if offered, will be lost when a subscription is purchased. Terms of use: https://mytimezero.com/eula/ Privacy policy: https://mytimezero.com/privacy-statement/
Screenshots
Verdict
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 (#23 vs #83). On rating, ratings volume, ads and in-app purchases 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
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.
| Parameter | Tide Graph | TZ iBoat |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.8 (1.6K ratings) — better | 4.6 (885 ratings) |
| Positive reviews | 69.6% of reviews | 79.6% of reviews — better |
| Number of ratings | 1.6K — better | 885 |
| Update frequency | Every 6 weeks | Every 8 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Best chart rank | #23 — better | #83 |
| Devices | iPhone, iPad, iPod, Apple TV, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 14.2 |
| Further details — not scored | ||
| Size | 30 MB | 428 MB |
| Age rating | 4+ | 4+ |
| Developer | Brainware LLC | Nobeltec, Inc. |
Customer experience
Tide Graph
TZ iBoat
User reviews
Tide Graph
From 1.6K App Store ratingsWhat we love
- ⭐ Accurate tide data
- 📊 Excellent visual representation of tides
- 🗓️ Detailed tide information including moon phases
- 🔍 Reliable for many locations
- 💰 Good value for the price
Room to improve
- 🌐 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
TZ iBoat
From 885 App Store ratingsWhat we love
- 🚀 Easy to use
- 🚀 Accurate charts
- 🚀 Useful features (weather, tides, currents, etc.)
- 🚀 Good integration with Furuno radar and AIS
- 🚀 Seamless cloud sync between devices
Room to improve
- 🐛 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
Bugs and requests
Tide Graph
Reported bugs
3 issues- Tide data inaccuracies reported in some locations
- Crashes and freezes when switching between stations
- Date/time display issues in certain cases
Requested features
5 requests- 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
Reported bugs
3 issues- GPS position not updating reliably while moving
- Radar overlay not functioning properly
- Compatibility issues with older devices or iOS versions
Requested features
5 requests- 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
In-app purchases
Tide Graph
- 2015 Tides and Currents$0.99
- 2016 Tides and Currents$0.99
- 2017 Tides and Currents$0.99
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- 2018 Tides and Currents$0.99
- 2019 Tides and Currents$0.99
- 2020 Tides and Currents$0.99
- 2021 Tides and Currents$0.99
- 2022 Tides and Currents$0.99
- 2023 Tides and Currents$0.99
- 2024 Tides and Currents$0.99
- 2026 Tides and Currents$0.99
TZ iBoat
- Essential Subscription$2.991 Month
- Premium Subscription$9.991 Month
- Great Lakes7 Days trial$19.991 Year
Show 8 moreShow fewer
- Canada East and North7 Days trial$19.991 Year
- Canada West7 Days trial$19.991 Year
- USA7 Days trial$19.991 Year
- Bahamas7 Days trial$30.991 Year
- Central America & Caribbean7 Days trial$30.991 Year
- Elite Subscription$39.991 Month
- Western Mediterranean7 Days trial$40.991 Year
- Eastern Mediterranean7 Days trial$61.991 Year
- AIS module$8.99
- Radar module$49.99









