| Roller | You want the least visible thing across the glass, or the most view kept per centimetre of stack. | The room needs the light aimed rather than reduced, or the opening is badly out of square. | Yes, with a blackout cloth and a mount that deals with the perimeter. |
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| Zebra | The requirement changes during the day — view at eleven, covered by seven. | The room has to be dark, or the window is a door you walk through. | No. Closed bands are private, not dark. |
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| Blackout | Somebody sleeps there, or a screen has to be readable at noon. | You want to keep any view, or the window is in a room you sit in all day. | Yes — that is the whole point, and the mount decides how well. |
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| Venetian | You want to redirect light rather than block it, or privacy without darkness. | The room must be dark, or it is full of steam and the slats are timber. | No. Closed slats overlap; they do not seal. |
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| Vertical | It is a sliding door, or a window wider than about two and a half metres. | It is an ordinary square window you look through constantly. | No. The overlaps pass light down every join. |
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| Roman | The room needs softening, and the window is seen from a chair. | It is a kitchen or a bathroom, or you need every centimetre of the view. | Close, with a blackout lining — but not at the edges. |
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