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

HeyForm
Stock Card (Beta)
Formlets
metro
Proof.ink
React
Svelte
Immutable persistent data collections for Javascript which increase efficiency and simplicity. - immutable-js/immutable-js

Which is more popular?
Based on our record, Cal.com seems to be a lot more popular than Immutable.js. While we know about 60 links to Cal.com, we've tracked only 4 mentions of Immutable.js.
Website, pricing, platforms and company facts side by side.
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| Website | cal.com | github.com |
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What each product offers, as listed by its team.


Possible disadvantages
No features have been listed yet.
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of Immutable.js yet.
Walkthroughs and reviews on video.
What can you do with Cal? | Cal.com Version 1.1 Launch | 10 new languages
More videos
Immutable.js Tutorial - How to Create Immutable Data Structures with Immutable.js
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Cal.com and Immutable.js. 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...
We have no reviews of Immutable.js yet. Be the first one to post
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 / 8 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 / 9 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 / 9 months ago
The Immutable.js README has a much more complete description of immutability and why you might want to use the library. Also worth mentioning that Immer is an alternative which is a bit easier to get started with. - Source: dev.to / almost 4 years ago
You could create explicitly immutable references and state by using a tool like Immer.js or Immutable.js and do something like your example using their API. Source: over 4 years ago
There are also libraries such as Immer and Immutable that were created to make our lives easier while dealing with immutability in JavaScript. - Source: dev.to / almost 5 years ago
When comparing Cal.com and Immutable.js, you can also consider the following products.

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.
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Paperless data collection with better data insights
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Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
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Invest in great companies without time consuming research
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Optimize your schedule with custom booking pages and calendar integrations
Compare TidyCal to Cal.com or Immutable.js:

Make beautiful, powerful forms with the #1 online form creator
Compare Formlets to Cal.com or Immutable.js: