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

Zoho Invoice
FreshBooks
invoicely
Invoice Ninja
InvoicePlane
QuickBooks Online
Wave Financial
Free GST billing & invoicing software for Indian SMEs and freelancers. Create GST invoices in 30 seconds, send via WhatsApp, track payments — all free.

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 | ozydo.com |
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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
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Cal.com and Ozydo.
Ozydo's answer:
Next.js, TypeScript, Tailwind CSS, Supabase, Resend
Ozydo's answer:
Ozydo is the only free GST invoicing app built specifically for India — with built-in UPI QR codes on every invoice, one-tap WhatsApp sharing, and auto GST calculation (CGST/SGST/IGST). No other free tool combines all three in one place.
Why should a person choose Ozydo over its competitors?
Ozydo's answer:
Zoho and QuickBooks charge ₹1,000–5,000/month. Ozydo is 100% free, forever. It's faster (invoices in 30 seconds), India-first (UPI, WhatsApp, GST-native), and built for SMEs and freelancers — not enterprise teams.
Ozydo's answer:
Indian freelancers, consultants, and small business owners who need to create GST-compliant invoices quickly without paying for expensive software.
Ozydo's answer:
Ozydo was built after seeing millions of Indian freelancers waste hours every week creating invoices manually in Excel. The goal was simple: make GST invoicing so fast and easy that any business owner could do it in under a minute — for free.
Ozydo's answer:
Ozydo serves independent freelancers, graphic designers, consultants, CA firms, and small retail businesses across India.
Share your experience with using Cal.com and Ozydo. 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 Ozydo 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 / 7 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 / 8 months ago
Tracking Ozydo since May 2026.
When comparing Cal.com and Ozydo, 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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100% free online invoicing software for small businesses.
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Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
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The ideal accounting software for small business owners.
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Optimize your schedule with custom booking pages and calendar integrations
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invoicely is a free online invoicing platform for small businesses
Compare invoicely to Cal.com or Ozydo: