OnBook.io
Calendly
Canbook
SetMore
Cal.com
Acuity Scheduling
Bookoint
BookSteam
React Engine
OnBook is a modern appointment scheduling platform designed for professionals who want to spend less time on admin and more time with clients. Trusted by 700+ professionals, OnBook provides a complete suite of tools to automate scheduling, manage clients, and grow your business.
Key highlights include smart scheduling with real-time availability that lets clients book 24/7, automated email and SMS reminders that reduce no-shows by up to 80%, and seamless calendar sync with Google, Outlook, and Apple Calendar. OnBook also offers online payments through secure Stripe integration, detailed analytics and reports, and custom branded booking pages.
For teams, OnBook supports multi-professional management with individual schedules, service packages with bundled discounts, coupons and promotional codes, recurring appointments, social booking links with QR codes and UTM tracking, and an embeddable widget for any website.
OnBook offers a free-forever plan with no credit card required, making it easy to get started. Paid plans start at $9.90/month for growing businesses and $29.90/month for unlimited access with priority support and API access. Data is protected with bank-level 256-bit SSL encryption and HIPAA compliance.
OnBook.io React EngineOnBook.io's answer
OnBook stands out as a complete multi-tenant SaaS platform built specifically for service professionals. Unlike many competitors that focus only on scheduling, OnBook integrates appointment management, client management, online payments (via Stripe), automated email/SMS reminders, and detailed analytics all in one place. It also offers a public booking page with an embeddable widget and QR code, multi-language support (Portuguese and English), Google Calendar sync, and a fully responsive interface optimized for both mobile and desktop. The platform is designed to reduce admin time so professionals can focus on their clients.
OnBook.io's answer
OnBook offers several advantages over competitors like Calendly and SetMore. First, it provides a generous free-forever plan with no credit card required, making it risk-free to get started. Second, OnBook is an all-in-one solution that combines scheduling, client management, service packages, online payments, and business analytics โ eliminating the need for multiple tools. Third, it features automated email and SMS reminders that reduce no-shows by up to 80%. The platform also supports team management with individual schedules, recurring appointments, coupons and discounts, social booking links with QR codes, and an embeddable widget. With 99.9% uptime and a 4.9/5 customer rating, OnBook delivers reliability and quality at competitive pricing starting at just $9.90/month.
OnBook.io's answer
OnBook's primary audience is service professionals and businesses that rely on appointment-based work. This includes beauty salons, clinics, consultants, personal trainers, therapists, dentists, fitness studios, and similar service providers. The platform is ideal for solo practitioners who want to automate their scheduling, as well as teams with multiple professionals who need individual schedules and centralized management. OnBook is particularly well-suited for professionals in Brazil and English-speaking markets, as it supports both Portuguese (BR) and English languages.
OnBook.io's answer
OnBook was created by TeddyLabs in 2025 with the vision of building a modern, complete appointment scheduling platform for service professionals. The founders noticed that many existing solutions were either too complex and expensive, or too simple and limited. OnBook was built to fill that gap โ offering a powerful yet easy-to-use platform that covers everything from scheduling and client management to payments and analytics. Starting as an MVP, it has grown to serve over 700 professionals with more than 50,000 appointments booked, while maintaining a strong focus on user experience and reliability with 99.9% uptime.
OnBook.io's answer
OnBook is built with a modern tech stack:
Based on our record, React Engine seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I was wondering to use paypal's React Engine (https://github.com/paypal/react-engine), but I have some doubts:. Source: over 4 years ago
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Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
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