Cal.com
Open-core scheduling platform (a Calendly alternative) with a fully free hosted tier and a self-hosting option.
Scheduling infrastructure you can run and own outright, the anti-walled-garden instinct that also drives wanting a price tracker that isn't locked to one retailer.
Cal.com does the same core job as Calendly, a booking link that reads your real availability and lets people schedule directly into your calendar, but it's built as an open-core platform rather than a closed, proprietary product. That means a fully free hosted tier with the complete feature set, plus the option to self-host the entire thing yourself if you'd rather not depend on any single company's servers for something as core as your calendar.
For a solo founder who already thinks this way about other parts of their stack, running open tools they can inspect or move away from rather than being locked into one vendor, that philosophy is the actual appeal, not just a cheaper price tag. The self-hosting option specifically means you're never at the mercy of a pricing change or a company shutting down access to your own scheduling infrastructure.
Functionally it covers the same ground as Calendly: configurable availability, buffer times, multiple event types, video-call integrations. The hosted free tier genuinely doesn't cripple the feature set the way some "free" tiers do elsewhere, it's the full core product, not a stripped-down teaser.
Team plans, for round-robin booking and shared team scheduling, start from $12 per seat per month on the hosted version. If you do choose to self-host instead, there's no seat-based subscription cost at all, just the infrastructure you're already running or willing to set up.
Frequently Asked Questions
What does "open-core" actually mean for Cal.com?
The core platform is open source, meaning the code is publicly available and you can self-host it entirely on your own infrastructure if you want full control and no dependency on Cal.com's servers. The hosted version, run by the company, is the easier option most people use, with a genuinely free tier and paid team plans on top.
Is Cal.com's free tier actually as good as Calendly's?
Yes, arguably more generous. Cal.com's free hosted tier includes the full core feature set rather than a stripped-down version, configurable availability, multiple event types, and video-call integrations are all included without paying.
Why would I self-host Cal.com instead of just using the hosted version?
Self-hosting means your scheduling data and infrastructure are entirely under your own control, no dependency on Cal.com's company staying operational, changing its pricing, or having access to your booking data. It's the choice for anyone who specifically values platform independence over convenience, at the cost of having to run and maintain the infrastructure yourself.
How much do Cal.com's team plans cost?
On the hosted version, team plans with round-robin booking and shared scheduling start from $12 per seat per month. If you self-host instead, there's no seat-based subscription fee, just your own infrastructure costs.
Should I pick Cal.com or Calendly for my small team?
Functionally they cover very similar ground. Calendly is more established and more people recognise it, so booking with you feels more familiar to the other person. Cal.com's free tier is more generous and it offers real platform independence through self-hosting. If brand recognition matters more, Calendly; if platform independence and a fuller free tier matter more, Cal.com.
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