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

JSONFormatter.org
JSONLint
JSON Editor Online
JSON Formatter & Validator
CodeBeautify
DeveloperTools.Tech
CyberChef
Free online tools for developers: regex tester, CSS generators, JSON formatter, Base64 encoder, and 50+ more.

Which is more popular?
Based on our record, Cal.com seems to be more popular. 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 | devlab.tools |
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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
No analysis of DevLab.tools yet.
Walkthroughs and reviews on video.
What can you do with Cal? | Cal.com Version 1.1 Launch | 10 new languages
More videos
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Cal.com and DevLab.tools. 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 DevLab.tools 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 / 8 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
Tracking DevLab.tools since Jun 2026.
When comparing Cal.com and DevLab.tools, 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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Online JSON Formatter and JSON Validator will format JSON data, and helps to validate, convert JSON to XML, JSON to CSV. Save and Share JSON
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Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
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JSON Lint is a web based validator and reformatter for JSON, a lightweight data-interchange format.
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Optimize your schedule with custom booking pages and calendar integrations
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View, edit and format JSON online
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