PickTime
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PickTime offers free appointment scheduling built to integrate with your existing tools. It accepts payments through Stripe, generates invoices, and connects with Zoom and Google Meet so clients can jump straight into online consultations from their booking confirmation.
It works well for consultants, therapists, and service providers testing the market or running lean. The free tier removes the friction of adding scheduling software, with paid upgrades available if you need team management or advanced reporting.