iStreams North Sea (E) vs COLREG
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
iStreams North Sea (E)
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iStreams gives you instant access to the North Sea East tidal stream atlas, aligned to the current time using High Water at Dover β even when you're offline. Whether you're sailing, navigating coastal waters, or passage planning, iStreams helps you understand tidal flow quickly and accurately. Key Features: Real-time tidal stream charts Automatically displays the correct hourly chart based on the nearest Dover High Water time. Fully offline functionality (forecast link requires a connection) No signal? No problem. All charts and tools work without internet access. Automatic chart updates As time progresses, the app switches to the next valid tidal period. Swipe forward and backward through tidal hours with ease. Pinch to zoom and drag to explore details. Toggle between Local Time and UTC. Navigation Tools: Interpolated Rate Calculator * Instantly calculate stream rate between neaps and springs. Tidal Set Tool (In-App Purchase) * Measure the true direction of tidal stream arrows with precision. Course to Steer (CTS) (In-App Purchase) * Calculate the correct heading to maintain your intended course. How It Works: iStreams automatically selects the nearest High Water at Dover and displays the corresponding tidal stream chart. Want to plan ahead or review earlier conditions? Simply select a date or swipe forward or backward through the tidal hours to view past or future data. Why Choose iStreams? Designed for sailors, navigators, and coastal users Fast, clear, and easy-to-use interface Accurate tidal data when you need it most
COLREG
Master maritime navigation with this comprehensive guide to the International Regulations for Preventing Collisions at Sea. Learn about ship lights, day shapes, sound signals, and access the full COLREGs for safe sailing.
- Ship lights guide
- Day shapes meanings
- Sound signals library
- Complete COLREGs access
- Flashcards for study
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Introducing the Ultimate COLREG App - Your All-in-One Guide to Safe Navigation! Set sail with confidence and master the rules of the sea like never before with our comprehensive COLREG App, now available on the App Store. Whether you're a seasoned mariner or a maritime enthusiast, this app is your essential companion for understanding and applying the International Regulations for Preventing Collisions at Sea (COLREGs). β’ Ship Lights: Navigate the darkness with ease! Our app provides a detailed guide to ship lights, helping you identify vessels and their activities based on their unique light configurations. β’ Daily Shapes: Decode maritime signals effortlessly! Learn about the various day shapes and their meanings, ensuring you're always prepared to interpret the intentions of other vessels. β’ Sound Signals: Understand the language of the sea! Explore a comprehensive library of sound signals, so you can effectively communicate with other vessels and enhance safety on the water. β’ Rules: Dive deep into the COLREGs! Access the complete set of regulations, organized for easy reference, to ensure you're always aware of your rights and responsibilities at sea. β’ Flash Cards: Study on the go! Our flashcards make learning COLREGs a breeze. Test your knowledge and reinforce your understanding wherever you are. Master the art of safe navigation and enjoy peace of mind on the open water with our COLREG App. It's the ideal companion for both novice and experienced sailors, helping you stay compliant and avoid collisions. Don't leave your safety to chance β download our COLREG App today and gain the knowledge you need to sail with confidence. Make the smart choice for safe navigation and get started now! Smooth sailing is just a download away. Get our COLREG App from the App Store today and embark on a journey to safer, smarter, and more enjoyable boating experiences.
Screenshots
Verdict
The clearest difference is price: iStreams North Sea (E) at Free against COLREG's $0.99. iStreams North Sea (E) also leads on update cadence (every 2 months vs every 7 months). COLREG's advantage is in-app purchases (none vs 6) and iOS requirement (12.0 vs 18.4). On ads and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
iStreams North Sea (E) is free to download; COLREG costs $0.99 up front. iStreams North Sea (E) sells 5 one-off in-app purchases. COLREG asks for nothing beyond the download.
iStreams North Sea (E) ships an update every 2 months, COLREG every 7 months. The most recent releases landed on October 16, 2026 and October 27, 2026 respectively.
| Parameter | iStreams North Sea (E) | COLREG |
|---|---|---|
| Price | Free β better | $0.99 |
| Positive reviews | β | 0.0% of reviews |
| Update frequency | Every 2 months β better | Every 7 months |
| Ads | No | No |
| In-app purchases | Yes | No β better |
| Monetization | β | Paid |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.4 | 12.0 β better |
| Further details β not scored | ||
| Size | 40 MB | 133 MB |
| Age rating | 4+ | 4+ |
| Developer | Navtech Software | Oleksandr Kuzmychov |
In-app purchases
iStreams North Sea (E)
- Unlock Set tool2 variants$1.99
- 1 Month Subscription$2.99
- 6 Month subscription$2.99
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- Unlock CTS tool$3.99
- 1 Year subscription$5.99
COLREG
No in-app purchases
Questions
Is iStreams North Sea (E) free?
Is COLREG free?
Do iStreams North Sea (E) or COLREG have ads?
Which is updated more often, iStreams North Sea (E) or COLREG?
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