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Courier provides a notification management platform that allows developers to effectively route user notifications across various communication channels, such as email, SMS, and messaging apps. By utilizing an API, the platform intelligently determines the optimal channel for delivering messages based on user engagement and online status. This capability enables businesses to craft a single message that can be reused across multiple channels or customized for specific platforms, ensuring timely and relevant communication with users, business partners, and external stakeholders. With a commitment to customer success, Courier has evolved alongside technological advancements while maintaining stable management practices and long-term relationships with its clients.

Nylas Inc., established in 2013 and headquartered in San Francisco, develops a communications platform-as-a-service (CPaaS) that facilitates seamless connectivity between applications and email, calendar, and contact services. The company's flagship product, Nylas, enables businesses worldwide to automate manual tasks, create personalized experiences, and gain insights from communication data. It offers bi-directional sync with major providers like Gmail, Outlook.com, Microsoft Exchange, Office 365, and IMAP, supporting embedded calendar features and recurring events. Nylas operates additional locations in New York and Denver.

Courier provides a notification management platform that allows developers to effectively route user notifications across various communication channels, such as email, SMS, and messaging apps. By utilizing an API, the platform intelligently determines the optimal channel for delivering messages based on user engagement and online status. This capability enables businesses to craft a single message that can be reused across multiple channels or customized for specific platforms, ensuring timely and relevant communication with users, business partners, and external stakeholders. With a commitment to customer success, Courier has evolved alongside technological advancements while maintaining stable management practices and long-term relationships with its clients.

Nylas Inc., established in 2013 and headquartered in San Francisco, develops a communications platform-as-a-service (CPaaS) that facilitates seamless connectivity between applications and email, calendar, and contact services. The company's flagship product, Nylas, enables businesses worldwide to automate manual tasks, create personalized experiences, and gain insights from communication data. It offers bi-directional sync with major providers like Gmail, Outlook.com, Microsoft Exchange, Office 365, and IMAP, supporting embedded calendar features and recurring events. Nylas operates additional locations in New York and Denver.

Clara Labs, founded in 2014 and based in San Francisco, California, developed an online platform named Clara that automates meeting scheduling via email. The service is designed for both enterprises and individual employees, facilitating efficient communication and organization. Clara Labs is recognized for its innovative work in human-in-the-loop natural language processing systems, contributing to the development of a conversational user experience. In 2019, the company was acquired by TopFunnel, which continues to operate the Clara service, while Twitter acquired its research and development talent along with some intellectual property for content moderation purposes. Clara Labs operates as a subsidiary of Third Street Data, Inc.