They look almost identical from the doorway. On court, the rules on where the ball can go make them completely different games.
In squash, the ball must hit the front wall directly and stay below a marked line - precision matters most. In racquetball, the ball can hit any wall, the floor, or the ceiling before the front wall, which makes for a faster, higher-bouncing, less predictable game.
The equipment reflects the difference too - squash rackets are built for control, racquetball rackets are built for power in a much smaller swing radius.
Squash's single biggest constraint is that every shot has to reach the front wall directly, below the out line, which is what forces the long, controlled, angled shots the sport is known for. Racquetball drops that constraint almost entirely - a serve or return can carom off the ceiling or a side wall on its way to the front wall, which produces far more unpredictable bounces and rewards raw power more than precision.
This single rule difference is really the root of everything else that feels different between the two sports.
Squash is widely rated among the most physically demanding racket sports because of the constant low lunges and sustained rally length. Racquetball rallies tend to be shorter and more explosive, trading endurance for bursts of power. Both are excellent cardio workouts, but they train different things.
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