iSpades on Mac DOES NOT FEATURE online play. This is offline only.
iSpades is a classic Spades game for your Mac. You can play a game of Spades with three robots either teaming up with the player sitting across to play partnership or play solo (also known as cut-throat) where each player bids for himself.
iSpades offers a lot of features and options and has the best AI than any Spades game on any platform.
Spades Variations

iSpades allows the following variations of Spades game -
Standard (Solo or Partnership) - A Standard Game of Spades with a Standard Deck
Classic (Solo or Partnership) - A game with Big and Small Joker
Suicide - A game were both the teams must have at least 1 nil bidder each
Mirror (Solo or Partnership) - A game were you can only bid exactly as many spades as you have
Bag Em (Solo or Partnership) - A game were you bid 1 and sandbag the opponents