Type your seven letters and Wortfinder shows every English word you can play, scored with Wordfeud's letter values. They are not quite the same as in Scrabble: a B or a C is worth 4 in Wordfeud, a J 10, and playing all seven tiles earns a 40-point bonus instead of 50.
Add open letters on the board below your rack. Set the double and triple squares your word covers under "Premium squares": Wordfeud can shuffle its board, so the helper asks about the squares, not the layout.
Several letters score differently (B, C and H 4, J 10, K 5, U 2), the bag holds 104 tiles, and playing all seven tiles is worth 40 points. The board can be random. Otherwise the rules are the same as Scrabble.
Type a question mark or a space, or tap "+ Blank". A blank scores 0, in Wordfeud too.
Nearly. Wordfeud has its own word lists; Wortfinder searches ENABLE, a free public-domain list close to the North American one, plus British spellings from SCOWL and the extra two-letter words Collins allows (such as CH, ZO and QI). Most words agree, but now and then one is missing or extra. If in doubt, try it in Wordfeud: the game rejects an invalid word without costing you your turn.