Software Alternatives, Accelerators & Startups

Cal.com VS OneCal.io

Compare Cal.com VS OneCal.io and see what are their differences

Cal.com logo Cal.com

Cal.com (formerly Calendso) is the open source Calendly alternative.

OneCal.io logo OneCal.io

Sync Outlook and Google Calendars in real-time, share booking links, and view all your calendars in one view.
  • Cal.com Landing page
    Landing page //
    2023-10-08
  • OneCal.io Landing page
    Landing page //
    2023-10-10

OneCal is a tool that syncs Outlook and Google Calendars, provides intuitive booking links that make scheduling simple, and allows you to view Outlook and Google Calendars in one view. The service is cloud-based, so there is nothing to install, and the setup is very intuitive.

Main features:

• Calendar Sync: OneCal is the most advanced Calendar Sync software in the market. Sync multiple Google or Outlook calendars in real time, reflect your availability, and keep your personal life private.

• Booking Links: Effortlessly manage your appointments, meetings, and events with our user-friendly booking links. Say goodbye to tedious back-and-forth communication and confusion.

• Calendar View: With OneCal Calendar View you can view Outlook and Google Calendars in one place, hide clones created by OneCal Calendar Sync, and much more.

Cal.com features and specs

  • Customizable
    Cal.com allows extensive customization to fit various branding and scheduling needs, which makes it adaptable for different types of users including businesses and individuals.
  • Open-source
    Being an open-source platform, Cal.com provides the flexibility for developers to modify and extend the software as per their specific needs, fostering a collaborative development environment.
  • Integrations
    Cal.com offers a wide range of integrations with other software tools like Google Calendar, Microsoft Outlook, and Zoom, enhancing its functionality and making it easier to fit into existing workflows.
  • User-friendly Interface
    Cal.com has an intuitive and clean interface that makes it easy for users of all technical skill levels to set up and manage their scheduling.
  • Privacy-focused
    Cal.com emphasizes data privacy, ensuring user information is handled securely, which is crucial for users who need to comply with regulations like GDPR.

Possible disadvantages of Cal.com

  • Learning Curve
    Although it is highly customizable, the plethora of options and features may result in a steeper learning curve for new users who are not familiar with such scheduling tools.
  • Limited Free Version
    The free version of Cal.com comes with limitations that may not be sufficient for growing businesses or advanced users who require more comprehensive features.
  • Dependency on Integrations
    Cal.com's effectiveness heavily depends on its integrations. Without these integrations, some users might find the tool less useful or incomplete, especially if their primary tools are not supported.
  • Support
    While open-source has many benefits, it may also mean that immediate, personalized support could be limited compared to fully commercial solutions. This might pose a challenge for users needing quick resolutions.
  • Performance
    As an open-source platform, the performance might vary depending on how it is hosted and managed. Suboptimal configurations could lead to slower performance or downtimes.

OneCal.io features and specs

  • Outlook and Google Calendar Sync
  • Booking Links
  • Flexible and Fully Configurable
  • Calendar View
  • Multi-Way Syncs
  • Team Plans
  • Simple Interface

Cal.com videos

What can you do with Cal? | Cal.com Version 1.1 Launch | 10 new languages

More videos:

  • Review - Cal.com Version 1.0 Launch Event

OneCal.io videos

OneCal Demo

Category Popularity

0-100% (relative to Cal.com and OneCal.io)
Productivity
93 93%
7% 7
Appointments and Scheduling
Calendar
0 0%
100% 100
Appointment Scheduling
100 100%
0% 0

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Cal.com and OneCal.io

Cal.com Reviews

I've poked around a while ago at some Calendly alternatives (specifically was lo... | Hacker News
I tried using https://cal.com for a bit but ended up just switching over to https://zcal.co and it has been great so far. All these other scheduling tools end up trying to do too much and always seem to end up a bit clunky and charge absurd amounts for it

OneCal.io Reviews

We have no reviews of OneCal.io yet.
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Social recommendations and mentions

Based on our record, Cal.com seems to be a lot more popular than OneCal.io. While we know about 56 links to Cal.com, we've tracked only 2 mentions of OneCal.io. 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.

Cal.com mentions (56)

  • 5 Side Project Ideas for Developers to Monetize as Micro-SaaS in 2025
    Take Cal.com (https://cal.com/), formerly known as Calendso. It started as an open source alternative to Calendly which offers a free, self-hostable version for users. - Source: dev.to / 2 months ago
  • Using Clerk SSO to access Google Calendar and other service data
    BookMate is an open-source, publicly accessible, lightweight clone of popular booking services like cal.com or Calendly. - Source: dev.to / 5 months ago
  • My Journey into Open Source: First Contributions and Lessons Learned
    Then, I came across Cal.com, a fantastic open-source project for scheduling meetings and managing tasks (super useful for productivity!). I knew the basics of Git but wasn’t quite there with forking, merging branches, and all the intricate Git processes. After some YouTube tutorials, I started to get the hang of things. 😅. - Source: dev.to / 6 months ago
  • Start your own (side) business with open-source in mind
    Cal.com is an open-source event-juggling scheduler for everyone, and is free for individuals. - Source: dev.to / about 1 year ago
  • Fellow HSP entrepreneurs, how do you manage your energy and stress?
    I force clients who want to talk to me to book a call. I use cal.com (free) and my Google Calendar (which its linked to) only allows calls on specific days/times. I have a few "Call Blocks" where they can book. That let's me do calls in a small section of my week, with ample downtime to recover the rest of the week. I'm still learning how many calls a day I can handle. Currently anything more than 2 is too much. Source: over 1 year ago
View more

OneCal.io mentions (2)

  • Managing Calendars?
    I use onecal.io It integrates with Google and Outlook, it has all the privacy controls I need to hide all the event details and just block the time across calendars. Source: almost 2 years ago
  • Update v356 has been released. Happy Update Day!
    I am trying onecal.io for the sync, so far so good but it’s going to be $4 per month. Source: about 2 years ago

What are some alternatives?

When comparing Cal.com and OneCal.io, you can also consider the following products

Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.

Calhub.app - Sync all your calendars. Schedule with true availability.

TidyCal - Optimize your schedule with custom booking pages and calendar integrations

SavvyCal - A scheduling tool both the sender and the recipient will love.

SyncThemCalendars - Setup a synchronization between calendars

zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.