Software Alternatives, Accelerators & Startups

Opa VS Calendly

Compare Opa VS Calendly and see what are their differences

Opa logo Opa

Opa is an open source, simple and unified platform for writing web applications.

Calendly logo Calendly

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.
  • Opa Landing page
    Landing page //
    2021-10-16
  • Calendly Landing page
    Landing page //
    2023-10-14

Calendly

Release Date
2013 January
Startup details
Country
United States
State
Georgia
City
Atlanta
Founder(s)
Tope Awotona
Employees
100 - 249

Opa videos

My food review at Opa of Greece!

More videos:

  • Review - Classic Game Room - OPA OPA review for Sega Mark III

Calendly videos

Calendly Sucks! Here's What I'm Using Now Instead...

More videos:

  • Tutorial - Calendly Tutorial: Book Yourself Solid on Autopilot
  • Review - Review: Calendly

Category Popularity

0-100% (relative to Opa and Calendly)
Web Frameworks
100 100%
0% 0
Appointments and Scheduling
Developer Tools
100 100%
0% 0
Appointment Scheduling
0 0%
100% 100

User comments

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Reviews

These are some of the external sources and on-site user reviews we've used to compare Opa and Calendly

Opa Reviews

We have no reviews of Opa yet.
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Calendly Reviews

  1. Best scheduling app

    Very simple and easy to use. Eliminate this back and forth hustle with booking calls.


The Best 24 Appointment Scheduling Apps and Booking Software
I have frequently used Calendly in the past, primarily for scheduling job interviews. What I appreciate about Calendly is that the free version still allows you to connect one calendar, book unlimited meetings, create a custom Calendly link, and send out automatic email notifications and reminders to invitees who book with you.
neetoCal, a calendly alternative, is a commodity and is priced accordingly
neetoCal is not the first company to compete with Calendly. We are not even the second company to compete with Calendly. We are probably the 30th player in this crowded space. With so many players in the market, scheduling software seems like a commodity.
Source: blog.neeto.com
I've poked around a while ago at some Calendly alternatives (specifically was lo... | Hacker News
Calendly is only $12/month for their professional plan which saves you money if you even schedule only one meeting a month with it.
The Best Alternatives to Doodle That You Should Check Out
Some may remember the Zoom.ai application. This app has been rebranded as CalendarHero, which resembles Calendly. You can suggest different meetings at different times and then share a link with invitees. Invitees can then indicate their preferred meeting time.
Source: trafft.com
The 14 Best Meeting Scheduling Tools for 2022
Some meeting scheduling apps are more about keeping your calendar organized; making sure you don’t double-book or spread yourself too thin. Calendly is on our list of meeting scheduling tools for 2022 as it’s an easy and user-friendly solution to allow people a window into your availabilities. With a custom URL, people can book an appointment with you, which will integrate...

Social recommendations and mentions

Based on our record, Calendly seems to be a lot more popular than Opa. While we know about 115 links to Calendly, we've tracked only 3 mentions of Opa. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Opa mentions (3)

  • Imba – The friendly full-stack language
    I remember Opa http://opalang.org/ tried something similar at the time when MongoDB was new and modern. - Source: Hacker News / 9 months ago
  • Ask HN: What web frameworks/technologies did not succeed as per your expectation
    We come across some web frameworks and technologies that we think will succeed, but they wither away as time passes by and don't succeed to the level we expected. Which web frameworks and or technologies did you come across that you thought would succeed but did not as per your expectations? For example, I thought that Opa Lang[0] and UrWeb[1] would succeed but did not, even though the ideas were sound. [0]... - Source: Hacker News / 11 months ago
  • Modern JavaScript:Everything you missed over the last 10 years(ECMAScript 2020)
    I think the Opa language was doing JSX-like code in the frontend before JSX http://opalang.org/ Both Opa and JSX were created in 2011. Opa had other innovations as well, such having the same code base run on both client and server (like Next.js). Unfortunately it didn't get traction and was abandoned by the creators. - Source: Hacker News / about 3 years ago

Calendly mentions (115)

  • A list of SaaS, PaaS and IaaS offerings that have free tiers of interest to devops and infradev
    CalendlyCalendly is the tool for connecting and scheduling meetings. The free plan provides 1 Calendar connection per user and Unlimited sessions. Desktop and Mobile apps are also offered. - Source: dev.to / 4 months ago
  • $30 study "Test your hearing" by ucr.edu(UC Riverside) .. Question.... Im confused... Anyone else do(ing) this study?
    Hey, wondering if anyone else snagged this study on hearing tests, 170 min long, and requires scheduling a zoom web conference, using calendly.com, for a future date. My question is... Did you have to schedule it out days out too? How did you close the study until then? It didnt seem right to me.... The earliest available date they had to schedule this was on Tuesday morning (Its Sunday). I obviously had to... Source: 11 months ago
  • Breaking Global Communication Barriers
    Calendly: This scheduling software allows you to set up availability times for different time zones, so that people can easily book a meeting with you without having to do the time zone conversion themselves. https://calendly.com/. Source: about 1 year ago
  • Need advice on making customers pay up front for remote tech support appointments
    Check out Calendly https://calendly.com/ . There are many add ons and services like this. Source: about 1 year ago
  • Rate my agency bad website
    - Too simple- No testimonials- No social- Form submission is too old, try calendly.com- Title of the page is still "Landing page" xD. Source: about 1 year ago
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What are some alternatives?

When comparing Opa and Calendly, you can also consider the following products

Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...

Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.

ASP.NET - ASP.NET is a free web framework for building great Web sites and Web applications using HTML, CSS and JavaScript.

Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.

ember.js - A JavaScript framework for creating ambitious web apps

YouCanBook.me - YouCanBook.me is a cloud-based service which allows your customers to schedule appointments and make bookings.