How Retell AI saved thousands of hours of development time with Cal.com

The Challenge

Retell AI, a leading voice AI platform, handles over 10 million calls monthly, helping customers integrate advanced scheduling capabilities into their AI phone agents. However, before adopting Cal.com, they faced significant challenges:

• Integrating scheduling tools like Calendly was cumbersome due to limited developer support and an inflexible API.

• Handling real-time slot availability and time zone complexities required extensive custom work.

• Building a custom solution from scratch would have been time-intensive and costly.

Retell AI needed a robust, developer-friendly scheduling solution to streamline these challenges and provide a seamless experience for their customers.

The Implementation

Retell AI discovered Cal.com through its sleek, embedded design on a SaaS website. After exploring its open-source nature and powerful API, they chose Cal.com over alternatives like Calendly for its flexibility and scalability.

The integration process was smooth, supported by Cal.com’s detailed API documentation and a highly responsive team. Peer and the Cal.com team provided personalized assistance via Slack, enabling Retell AI to implement additional APIs and tailor the solution to their unique needs.

The platform was integrated into Retell AI’s voice AI agent creation tool, empowering customers to build phone agents with seamless appointment booking capabilities.

The Features That Made a Difference

1. Developer-Friendly API: Cal.com’s flexible and robust API eliminated the need to juggle multiple tools, simplifying integrations with Google Calendar and other platforms.

2. Time Zone Management: Accurate and intuitive native timezone handling saved Retell AI’s customers from managing complex time zone differences.

3. Customizability: The ability to easily embed Cal.com’s scheduling functionality into Retell AI’s platform elevated the user experience.

4. Scalability: With no rate limit issues, Cal.com reliably supported Retell AI’s high monthly growth and millions of calls.

The Impact

By integrating Cal.com, Retell AI achieved significant operational and customer experience improvements:

• Saved 2+ days of development time for each customer by offering pre-built scheduling capabilities.

• Reduced scheduling complexities, enabling faster time-to-product for customers.

• Improved customer satisfaction through seamless time zone handling and easy-to-use booking features.

• Boosted scalability to support rapid growth without performance issues.

Retell AI’s customers responded positively, often expressing excitement over the scheduling functionality, recognizing it as a critical enhancement to their AI agents.

The Verdict

Cal.com has transformed Retell AI’s approach to scheduling, providing a reliable, developer-first solution that enhances their platform's value. Its flexibility, scalability, and ease of integration have allowed Retell AI to focus on growth while empowering their customers to streamline appointment booking effortlessly.

"Cal.com’s open API and seamless integration have been a game-changer. Our customers love it, and we couldn’t be happier with the results."

Looking Ahead

Retell AI plans to expand their use of Cal.com by implementing advanced features like rescheduling and canceling appointments via phone. These updates will further enhance the platform’s flexibility and utility for niche scheduling use cases.

For businesses looking for a scalable, developer-friendly scheduling solution, Retell AI’s experience highlights why Cal.com is the top choice.