问HN：在一对一日历调度工具中，必须具备的三项功能是什么？
今天，日历调度市场上充斥着许多工具，如Calendly、Cal.com等，这些工具功能丰富、选项众多，但价格较高。对于简单的一对一调度，独立创始人、独立开发者、项目经理、学生和研究人员在与潜在客户进行简单网络交流时需要哪些功能呢？有没有提供基本功能的工具呢？
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Today, calendar scheduling market is crowded with lot of tools like calendly, cal.com etc. with tons of feature and options with higher pricing.
But for simple 1-1 scheduling, what are the features that needed for solo founders, professionals like indie hackers, developers, PMs, students, researchers for simple networking with prospects.<p>Is there any tool who provides minimal things?