Open source Calendly rival raises $25M


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Let the OSS Enterprise newsletter guide your open source journey! Sign up here., the company behind an open source scheduling platform and Calendly alternative, has raised $25 million in a series A round of funding and launched what it calls an “app store for time” so developers can build their own apps on top of’s scheduling infrastructure.

Created initially last year as Calendso, the company rebranded as in September alongside its full product launch, as it set out to challenge the well-funded Calendly which now claims a lofty valuation of $3 billion. Late last year, raised a $7.4 million seed funding round from a slew of notable backers including YouTube cofounder Chad Hurley.

The problem that and its ilk are setting out to solve is one that is familiar to millions across the globe — endless emails, messages, and phone calls to find a suitable time for multiple people to meet (online or IRL). And the more stakeholders that are involved across regions and time-zone, the more difficult it is to find a slot where everyone can meet to discuss that critical project update.

To address this problem, offers what it calls “scheduling infrastructure for absolutely everyone,” targeting anyone from fitness instructors to companies such as Klarna and Deel. At its most basic level, meeting organizers use to share a scheduling link with invitees, who can then choose from multiple time slots — and the time slot that everyone can make is added to each participant’s calendar. in action in action

The platform includes a suite of pre-built integrations for the likes of Google Calendar, Outlook Calendar, Zoom, and Stripe, while an open API enables users to integrate with their own systems. And among its various pricing plans is an enterprise tier, which includes features such as single sign-on (SSO), audit logs, and an admin console.

Control and customization

While there are clear similarities with the likes of Calendly,’s main differentiator is is its open source credentials — it promises companies full data sovereignty and digital autonomy. Available on GitHub, gives companies control of all their data through self-hosting, which may be particularly important for highly-regulated industries such as health care or government bodies. Through a white-label offering, companies can also manage the “look-and-feel” of their deployment.

On top of that, if companies don’t want the hassle of self-hosting, then they can tap’s fully-hosted service.

Alongside its series A raise, has also introduced a bunch of new features, including the release of its new API, dynamic booking links, native video conferencing functionality, and — arguably the biggest update of all — a new app store. app store

With the app store, the company has essentially revamped how apps work within the platform — it now follows a more “modular and extensible architecture,” the company said, making it easier for developers to build apps for which anyone else can also use.

With another $25 million in the bank, said it will use its fresh cash injection to help developers launch new apps for its app store, and become “the best developer platform for building anything and everything time related” — this could be telehealth apps, productivity apps, marketplaces, and everything in between.’s series A round was led by Reddit cofounder Alexis Ohanian’s venture capital firm Seven Seven Six, with participation from OSS Capital, Obvious Ventures,, and myriad angel investors.

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