
Calendly
Acuity Scheduling
TidyCal
zcal
SavvyCal
SetMore
Doodle
Cal.com (formerly Calendso) is the open source Calendly alternative.

Chargebee
Recurly
involve.me
SlackPass
Stripe
Quorum
UniBee
Open-Source Subscription Billing and Payment Platform

Which is more popular?
Based on our record, Cal.com should be more popular than Killbill. It has been mentioned 60 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | cal.com | killbill.io |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
What can you do with Cal? | Cal.com Version 1.1 Launch | 10 new languages
More videos
Introducing the Open-Source Recurring Billing & Payments Platform | Kill Bill
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Cal.com and Killbill. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


The honest read: if you're leaving Acuity because your business outgrew simple scheduling — you need deposits, add-ons, multiple staff and locations, and ideally a booking site you own — Opencals is built for exactly...
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...
If you own a SaaS company, then you can benefit from using Kill Bill. It has all the essential features a SaaS business needs to run subscription billing processes. What is more, it is free, which means you can use it...
Recommendations tracked on public social media and blogs since March 2021.


Then for the component library, I was really into coss ui. I stumbled upon it randomly one day and loved it so much. My Nathan's AI project already had a UI heavily inspired by cal.com: send button, message suggestions... So when I saw... - Source: dev.to / 6 months ago
I keep coming back to what would have happened if I didn't have a strong technical understanding of how calendar technology works — the difference between local and cloud calendars, what an ICS feed is, why enterprise auth blocks... - Source: dev.to / 7 months ago
Plausible brought open source to web analytics. Cal.com did it for scheduling. Formbricks did it for surveys. PostHog did it for product analytics. Quackback does it for feedback collection. - Source: dev.to / 7 months ago
Hi, I own a small online business and was wondering if anything knew of a good online billing platform, hosting for recurring payments. I saw one online (killbill.io) but I was wondering if there was any other alternatives around. Thanks! Source: over 3 years ago
Great list, thank you. One option is to always have more than one payment processor activated. Splitting payments across providers early on doesn’t have to be a bad thing. There are libraries focused in billing and payment management... - Source: Hacker News / over 3 years ago
Submitted the github link because I couldn't find it from their marketing site: https://killbill.io/. - Source: Hacker News / almost 4 years ago
When comparing Cal.com and Killbill, you can also consider the following products.

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Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
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Optimize your schedule with custom booking pages and calendar integrations
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involve.me is a lead funnel builder used by companies to boost online conversions. Interactive flows within the funnels help guide, qualify and capture leads.
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