All different types of futons can be broken down into two categories: bi-fold futons and futon loungers.
Bi-fold frames have 2 body parts, the sitting part and the backrest part. Some manufacturers offer matching ottomans (optional). Ottoman is a separate piece and can be used as a bench.
Bi-fold body in sofa, lounge, and bed positions
Bi-fold futon with optional ottoman in seating, lounge, and bed positions
Futon lounger frames are also known as loveseats or space savers because they have an additional leg part (lounge extension) that folds into the frame and hides between the futon base and the seat deck.
Futon lounger body in sofa and bed positions
Lounger body in seating, lounge, and bed positions. Lounger mattress storage suggestion
Futon loveseats are great for providing maximum sleeping and sitting space in the minimum of floor space. They are ideal for small guest rooms, home offices, porches or any other spaces where the wall space needed for a full-size bi-fold frame just isn't there. With a full-size loveseat, you can fit a conventional full-size bed (54" x 75") into 60" of wall space. With a twin size loveseat, you can fit a conventional twin size bed (39" x 75") into 45" of wall space.
To gain some more storage space for your room, you can also buy an optional set of sliding futon drawers for your futon frame. Drawers come in standard sizes and fit under the sitting part of the frame. Some futons are also available with matching coffee and end tables.