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

Time and Date Calculator
Timer and Stopwatch
TimeLeft
WeekIsIt
Week Number
Weekplanner
Free calculator showing exactly how many weeks are left in the year: days remaining, current week number, work weeks, and year completion percentage.

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 | weekleft.com |
| Pricing | — | |
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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 WeekLeft 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.


As answered by people managing Cal.com and WeekLeft.
WeekLeft's answer:
Next.js, React, Vercel
WeekLeft's answer:
WeekLeft keeps every calculator focused on one question and answers it instantly. There are no no pop-ups and no cluttered pages. Business day calculations skip weekends automatically, and every result is easy to read on both mobile and desktop.
WeekLeft's answer:
Big sites like timeanddate.com cover hundreds of topics, so finding the right tool can take time. WeekLeft is built only for date and time math, so each calculator is quick to find, simple to use and loads fast. It is completely free, and each tool comes with a short guide explaining how the calculation works.
WeekLeft's answer:
People who need quick date answers in daily life and work: HR and payroll teams counting business days, project managers planning deadlines, students tracking exam dates, and anyone counting down to an event or checking how many weeks are left in the year.
WeekLeft's answer:
WeekLeft started as a small WordPress site with a few calculators. As it grew, it became slow and hard to maintain, so I rebuilt it from scratch in Next.js. During the rebuild I audited the whole site and fixed around 200 issues, including calculation errors, SEO problems and page speed. The goal now is simple: build the most reliable and easy to use date calculators on the web.
Share your experience with using Cal.com and WeekLeft. 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 WeekLeft 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 / 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 / 8 months ago
Tracking WeekLeft since Sep 2026.
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Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
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TimeLeft is a versatile desktop utility - it can be used as a countdown clock, reminder, clock...
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