You can set up a free account at simplybook.me. You should receive a monthly email to trigger the free version for the next month. If you find you really like it, you can upgrade to a paid (which is a modular/component based upgrade).
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If/when you add components, add the Google Calendar component.
That interaction between simplybook.me and Google calendar makes it all worth it! You can set your availability and people can schedule something and it goes directly to your calendar. No additional steps that could be forgotten.
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