Babysitters you tend to schedule weeks (or months) in advance — even before you have plans. So when it's 3 p.m. on Saturday and you suddenly realize the sitter's coming in three hours and you haven't scheduled anything, OpenTable makes it easy to snag a dinner reservation in minutes. The free app shows you which restaurants have open reservations at a specific time, saving time from calling around and hearing rejections all over. Best of all, when your friends ask where you're going, you sound like you've had it covered for weeks!
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