Cal.com

Teams that spend too much time trading emails to find a meeting slot, and developers who need scheduling built into their own product, are the people Cal.com is made for.

Cal.com is an open scheduling infrastructure with customizable scheduling software for individuals, businesses that take calls, and developers building platforms where users meet other users.

You can self-host it or use the SaaS version, which matters if you want control over where your data lives.

Features include routing, a unified calendar API, a desktop app and an enterprise API.

The pricing model is enterprise, so expect a sales conversation rather than a simple card checkout for larger setups.

Cal.com also offers Cal.ai, an AI scheduling assistant that includes AI phone agents.

That puts voice-based booking alongside the usual booking pages, which is a useful extra if calls are how your customers prefer to reach you.

As an AI scheduling tool, Cal.com is strongest for teams that want to customize how booking works.