Cal ID

Cal ID, developed by OneHash, is a flexible and feature-rich scheduling platform designed to eliminate the friction of manual appointment coordination for both individuals and teams. The software enables users to create customizable event types with tailored durations, availability windows, and booking rules, while supporting advanced scheduling modes such as round-robin distribution, collective events, and private single-use booking links — making it especially well-suited for sales and marketing teams managing high meeting volumes across multiple time zones. Beyond basic calendar management, Cal ID automates workflows by triggering actions based on scheduling events, sending reminders, and syncing across more than 35 integrations including Google Workspace, Microsoft Outlook, Zoom, Slack, HubSpot, and Zapier, allowing teams to embed scheduling seamlessly into their existing tech stack. The platform serves a broad range of industries and roles, from recruiters conducting interviews and educators coordinating with students and staff, to telehealth providers enabling patients to book appointments with physicians and retailers managing in-store reservations. With a free individual plan and business pricing starting at just $5 per user per month — and integrations accessible without expensive paywalls — Cal ID appeals strongly to small businesses, freelancers, consultants, and growing mid-market teams looking for a cost-effective alternative to tools like Calendly. Rated 4.7 out of 5 across 230 reviews, it earns consistent praise for its intuitive setup, powerful automation capabilities, and the time it saves by replacing back-and-forth email coordination with a streamlined, self-serve booking experience.