SailforceFor iPhone and iPad

See what the wind does to your sails.

Sailforce explains course, sheets and the forces on the sail – interactive and clear enough for the whole crew to follow. On the pontoon or mid-passage, even with no signal.

See pricing

Sailforce on iPhone: 3D yacht close-hauled with red and blue streamlines, a pressure field on the sail, a wake, the course ring and sheet sliders, with a palm island on the horizon

2D freetop view with wind triangle
3D with Proyacht with real physics
12 languagesfollows your device
0 trackersno account, no analytics

Who it’s for

For everyone who explains sailing – or wants to understand it.

Charter skippers

Your crew asks why the jib is aback or what “apparent wind” actually means? Instead of waving your hands, show them on your iPhone or iPad – on the pontoon, in the cockpit, over a sundowner.

Students and returning sailors

Before or after your sailing licence: turn the course, pull the sheets and instantly see what changes. That’s how theory sticks – and suddenly makes sense on board.

What it looks like

From first glance to gybe.

Scroll through the key views – real screenshots from the app.

01 / 06 Free

The 2D top view

A course ring for steering, the wind always from the top, jib and main sheets to pull. The wind triangle of true wind, boat-speed wind and apparent wind shows where the wind on board really comes from – plus arrows for drive and side force.

Sailforce on iPhone: the free 2D top view with the wind triangle of true wind, boat-speed wind and apparent wind, plus arrows for drive and side force

02 / 06 Pro

Sailing forces in 3D

A realistic 38–40 ft charter yacht to rotate and zoom. The physics follow real yacht polars: heel costs speed, and the boat accelerates and slows down with inertia.

03 / 06 Pro

A cutaway through the sail

Just like the textbook, only alive: streamlines and pressure distribution in suction and pressure colours. You can move the height of the cut up and down the mast.

Sailforce on iPhone: top view of the cutaway through the sail, airflow and pressure in blue and red, textbook style

04 / 06 Pro

Tack and gybe, live

Manoeuvres in real time, including the loss of speed. In a gybe the boom swings across – and the speed only builds up again gradually.

Sailforce on iPhone: yacht in the middle of a tack, head to wind, with wind streaks and course display

05 / 06 Pro

Wing on wing downwind

Jib to windward, main to leeward: Sailforce shows how wing on wing works downwind and why it gives you more speed.

Sailforce on iPhone: yacht running wing on wing, jib on one side, mainsail on the other, a mountainous island behind

06 / 06 Pro

Trim tips on board

Hints like “Jib luffing · haul the sheet” tell you what to do – for jib and mainsail, including a warning when an unintended gybe is looming downwind.

Sailforce on iPhone: trim hint “Jib luffing · haul the sheet” above the 3D yacht

On iPad too

Big enough for the whole crew.

On iPad, Sailforce becomes a whiteboard for the cockpit: everyone sees the same thing while you explain – and nobody has to imagine a chalk sketch.

Sailforce on iPad: 3D yacht close-hauled with streamlines, a wake, course ring, sheet sliders and a wind readout of 14 knots, Beaufort 4, with sun glitter on the water and a palm island in the background

Free and Pro

Start for free. Go Pro when you want more.

The 2D top view is free. You can take a look at the 3D view before buying – using it requires Pro.

Free

Sailforce

The 2D top view – free.

Course ring for steering, wind always from the top
Jib sheet port and starboard, main sheet
Wind triangle: true wind, boat-speed wind, apparent wind
Arrows for drive and side force
Trim hints such as “Jib is aback” or “In irons · bear away”
Wind strength in knots, km/h and Beaufort
A preview of the 3D view

Pro

Sailforce Pro

Everything in the free version, plus:

Realistic 3D charter yacht (38–40 ft) to rotate and zoom
Physics based on yacht polars: heel costs speed, inertia when speeding up and slowing down
Tack and gybe in real time, with loss of speed
Wing on wing
Animated wind lines for true and apparent wind
Cutaway through the sail: airflow and pressure, adjustable height
Trim tips for jib and mainsail, with a warning about unintended gybes

Both: 12 languages, offline, no account.

Pricing

Fair prices – even for a single trip.

No free trial, no tricks: you choose how long you need Pro.

Trip pass

€3.991 week

One-off, ends by itself

All Pro features for one week – made for a charter trip. No subscription, nothing to cancel.

Lowest monthly price

Pro yearly

€24.99per year

Pays off from 3 months

All Pro features for a year at an introductory price – roughly €2.08 per month.

Pro monthly

€8.99per month

Cancel any month

All Pro features, flexible from month to month.

Prices for Germany including VAT; the price shown in the App Store before you buy is what counts, and it may differ in other countries. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period in your Apple ID settings. The trip pass does not renew. Details in the terms of use.

Languages

Speaks your crew’s language.

Sailforce automatically follows the language of your iPhone or iPad – in twelve languages.

Deutsch
English
Polski
Français
Italiano
Español
Nederlands
Čeština
Hrvatski
Svenska
Dansk
Norsk

Your data stays on board.

No account, no analytics, no ads. Sailforce keeps your settings on your device only, and the simulation runs completely offline. Apple handles purchases; the app fetches current prices and your purchase status at every launch via the RevenueCat service, using a random identifier without name or email address – I never see your name or payment details.

All the details: privacy policy.

A learning model, not a navigation device. Sailforce shows sailing physics in simplified form, tuned to a typical 38–40 ft charter yacht. It does not replace training, seamanship or navigation – responsibility on board always stays with the skipper.

Questions

Frequently asked questions

When will Sailforce be available?

Sailforce is currently being prepared for the App Store. As soon as it’s available, you’ll find the link right here.

Is there a free trial?

No. The 2D top view is free and shows how Sailforce works, and you can take a look at the 3D view. If you only need Pro for one trip, the trip pass is the cheapest option: one week, €3.99, no subscription.

How accurate are the speeds?

Sailforce is a learning model tuned to a typical 38–40 ft charter yacht. The speeds are guide values and don’t transfer 1:1 to your boat. Factors include boat type and hull shape, load, sails and their condition (furling main, reefs), sea state, current, fouling on the hull, gusts and wind shifts, and how well the crew trims and steers.

Does Sailforce work offline?

Yes. The simulation runs entirely on your device and works without an internet connection – handy on board, where there often is no signal. When a connection is available, the app briefly fetches current prices and your purchase status at launch; purchases and restoring purchases need an internet connection.

What data do you collect?

Almost none. There is no account, no tracking and no analytics services. Settings stay on your device only. At every launch, the app sends a random identifier (without name or email address) and technical details (such as app version and device type) to the RevenueCat service to fetch current prices and your purchase status; purchases add Apple’s purchase receipts. The free 2D view also works entirely without internet. Details are in the privacy policy for Sailforce.

Which devices does Sailforce run on?

iPhone and iPad. A purchase applies to all devices using the same Apple ID – via “Restore purchases” in the app’s settings.

What happens when Pro ends?

You keep the free 2D top view. Cancelling, restoring, refunds: everything important is in Support.

Cast off.

Sailforce is coming soon to the App Store – for iPhone and iPad.