The North U Sail Trim Simulator is a training tool to help you develop your sail trim skills. Leveraging data from the North Sails Design Suite, the North U Sail Trim Simulator provides a full array of sail trim controls for mainsail and jib trim. In the app you can set wind speed and adjust trim to optimize performance and change views to any position on or off the boat. Currently using a J35 additional designs will be added over time.

What’s New

Version 1.0

This update is signed with Apple’s latest signing certificate. No new features are included.

Ratings and Reviews

1.6 out of 5
5 Ratings
5 Ratings
Perlxkc ,

Stay away

Absolutely pointless. The setting adjustments are non existent. I thought I could learn the effects of one trim over another on the overall boat... just pointless application. Save your money!

Benrinogaii ,

Look Elsewhere

This app is neither entertaining nor very educational. It's not worth your time trying to figure out if 'this is all there is to it,' or your money.

carlsonm54 ,

North Sail Simulator

Only shows optimized trim for close hauled course. Reaching trim and running trim should be included.

360 view of trim is helpful.

Drop the mm in adjustments. Genoa car forward or aft, sheet in ,sheet out would make more sense.


North Sails Group, LLC
84 MB
Requires iOS 9.0 or later. Compatible with iPhone 5s, iPhone 6, iPhone 6 Plus, iPhone 6s, iPhone 6s Plus, iPhone SE, iPhone 7, iPhone 7 Plus, iPhone 8, iPhone 8 Plus, iPhone X, iPhone XS, iPhone XS Max, iPhone XR, iPad Air, iPad Air Wi-Fi + Cellular, iPad mini 2, iPad mini 2 Wi-Fi + Cellular, iPad Air 2, iPad Air 2 Wi-Fi + Cellular, iPad mini 3, iPad mini 3 Wi-Fi + Cellular, iPad mini 4, iPad mini 4 Wi-Fi + Cellular, 12.9-inch iPad Pro, 12.9-inch iPad Pro Wi-Fi + Cellular, 9.7-inch iPad Pro, 9.7-inch iPad Pro Wi-Fi + Cellular, iPad (5th generation), iPad Wi-Fi + Cellular (5th generation), 12.9-inch iPad Pro (2nd generation), 12.9-inch iPad Pro Wi‑Fi + Cellular (2nd generation), 10.5-inch iPad Pro, 10.5-inch iPad Pro Wi‑Fi + Cellular, iPad (6th generation), iPad Wi-Fi + Cellular (6th generation), iPad Pro (11-inch), iPad Pro (11-inch), iPad Pro (12.9-inch) (3rd generation), iPad Pro (12.9-inch) (3rd generation), and iPod touch (6th generation).
Age Rating
Rated 4+
© North Sails LLC


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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