SailWatcher vs SailViewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SailWatcher
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SailWatcher is the perfect app for all sailing and boating lovers. Whether you are an expert or a beginner enthusiast, this app will help you plan, monitor and live your adventures at sea to the fullest. Key features: - Track course and key points: While sailing, SailWatcher records the boat's GPS position and that of the points where the shots were taken to retrieve parameters - Practical and fast: To perform the analysis, simply take a shot, select the areas of interest and finally the LUFF. - Share: Once the parameters are calculated, you can share all the information, including the photo and personal notes, by generating a unique URL. - SailWatcher Engine: An algorithm has been developed that, requiring only a few pieces of information from the user, identifies and evaluates the sail's shape lines, returning draft, camber, twist, entry and exit angle. Thanks to an intuitive interface and advanced features, SailWatcher allows you to focus on what you love most: sailing. The app is designed to offer you all the information you need, right in the palm of your hand. Download SailWatcher today and take your passion for sailing to a higher level! --- FREQUENTLY ASKED QUESTIONS - Which parameters does it calculate? SailWatcher calculates the following parameters: camber, draft, twist angle, entry angle, exit angle. It also saves the boat's speed at the moment the photo is taken. - Does it work on every sail? SailWatcher calculates the parameters of all sails with highlighted shape lines. If your sails have visible shape lines, you can use SailWatcher. - Is an internet connection required? SailWatcher is designed to be used on the open sea; it does not require an internet connection, except for some secondary functions (e.g. sharing). - Can I share the obtained data? Yes, via a unique URL. The web page will contain the photo, the shape lines with their parameters, additional data (wind speed, ...) and additional notes entered by the user. - Why can't I retrieve the data? SailWatcher performs a series of calculations to identify shape lines. If you can't retrieve the data for your sail, let us know by email. We will analyze the case and improve the algorithm so that it also identifies your sail.
SailViewer
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SailViewer turns sailing GPS and instrument logs into an interactive debrief on iPhone and iPad. Import a supported sailing file, choose the logs you want to open, and explore the race from several angles: • Track views with boats, courses, selections, and optional map backgrounds • Tables and graphs for comparing selected values • Polar analysis for speed and angle relationships • Start, Race, Boat, and Maneuvers views when supported by the data • Local image sharing from supported analysis windows SailViewer includes synthetic sample logs. Samples start closed, so you decide when to open them. You can import SW2, SLV, GPX, KML, NMEA, VTK, FIT, VKX, supported CSV sources, and supported ZIP archives. Your imported sailing files stay on your device unless you explicitly share them. Ordinary iPhones, including large iPhones, have permanently free local access and do not require weekly license checks. All iPads, including iPad mini, and this iPad app running on an Apple-silicon Mac are free through 31 December 2026. These devices require an internet connection for initial activation and at least once every seven days. Free access ends on 1 January 2027 at 00:00 UTC, when a paid subscription will be required. Purchasing will require a future app update; this release cannot take payments. There is no automatic charge. If access expires, your local library is retained. Optional error reports and usage summaries are off by default. Support reports are sent only when you choose to send them, and original sailing logs are not attached automatically. This is the new SailViewer app and is separate from the legacy SailViewer/TruSailViewer product. Automatic transfer from the legacy app is not promised; keep your original files and import supported formats into this app.
Screenshots
Verdict
SailWatcher and SailViewer are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | SailWatcher | SailViewer |
|---|---|---|
| Price | Free | Free |
| Update frequency | — | Every 3 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 16 — better | 17.0 |
| Further details — not scored | ||
| Size | 34 MB | 37 MB |
| Age rating | 4+ | 4+ |
| Developer | Deploynk srl | Master Sailing jdoo |
In-app purchases
SailWatcher
No in-app purchases
SailViewer
No in-app purchases
Questions
Is SailWatcher free?
Is SailViewer free?
Do SailWatcher or SailViewer have ads?
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