UI Ninja.

Agree on the flow.
Build with less rework.

Design device screens and interactions in one shared view, so product and engineering can make decisions before implementation.

Three device screens connected by two transitions in UI Ninja.
Flow view

Drag. Drop.
Make it work.

Add ready controls to the canvas, arrange the screen, and choose transition effects in the same place.

A device screen with ready controls on the UI Ninja canvas.
Design view
Dragging a button from the toolbar onto a device screen, with a drop preview and grid guides.
Drag & drop
Ready controls in a climate interface with temperature, operating modes, schedules and fan speed.
Ready controls
Transition settings for moving between device screens.
Easy transitions