Software Alternatives, Accelerators & Startups

AddEvent VS Google Open Source

Compare AddEvent VS Google Open Source and see what are their differences

AddEvent logo AddEvent

Add to Calendar tools and calendar marketing software that help businesses increase event attendance and audience engagement.

Google Open Source logo Google Open Source

All of Googles open source projects under a single umbrella
  • AddEvent AddEvent homepage
    AddEvent homepage //
    2026-05-18
  • AddEvent AddEvent Dashboard
    AddEvent Dashboard //
    2026-05-18
  • AddEvent AddEvent Templates
    AddEvent Templates //
    2026-05-18
  • AddEvent AddEvent Dynamic Add to Calendar
    AddEvent Dynamic Add to Calendar //
    2026-05-18
  • AddEvent AddEvent RSVP
    AddEvent RSVP //
    2026-05-18
  • AddEvent AddEvent Create Event
    AddEvent Create Event //
    2026-05-18
  • AddEvent Add to Calendar sharing options
    Add to Calendar sharing options //
    2026-05-18

AddEvent is a calendar marketing platform that helps businesses increase engagement, attendance, and retention through calendar-based experiences across Google Calendar, Outlook, Apple Calendar, Microsoft 365, and other major calendar platforms.

The platform provides powerful Add to Calendar technology, embeddable calendars, subscription calendars, RSVP tools, automated reminders, and calendar APIs that enable companies to turn events, webinars, product launches, campaigns, and announcements into lasting calendar engagement.

With AddEvent, businesses can create customizable Add to Calendar buttons and links, publish branded event calendars, manage RSVPs, automate event communications, and distribute events across websites, landing pages, emails, newsletters, and SaaS applications. Developers can integrate calendar functionality using flexible APIs and webhooks, while marketing and operations teams can launch calendar campaigns without extensive technical resources.

AddEvent supports a broad range of use cases including webinar promotion, virtual and in-person events, product announcements, recurring content calendars, training programs, customer onboarding, internal communications, community engagement, and event marketing automation. Organizations use AddEvent to improve attendance rates, increase campaign visibility, drive repeat engagement, and make calendars a central channel in their marketing strategy.

Trusted by marketers, publishers, SaaS companies, agencies, enterprises, and event-driven organizations worldwide, AddEvent helps brands connect with audiences so no important moment is missed.

  • Google Open Source Landing page
    Landing page //
    2023-09-22

AddEvent

$ Details
freemium $29.0 / Monthly ("Unlimited Events", "2,500 Add to Calendar clicks")
Release Date
2015 September

Google Open Source

Pricing URL
-
$ Details
-
Release Date
-

AddEvent features and specs

  • Ease of Use
    AddEvent provides a user-friendly interface that simplifies the process of adding events to calendars across multiple platforms such as Google Calendar, Apple Calendar, and Outlook.
  • Cross-Platform Compatibility
    The tool is compatible with a wide range of calendar applications, ensuring that users can add events regardless of their preferred platform.
  • Customization Options
    Offers extensive customization options for event notifications, links, and reminders, allowing users to tailor event details to suit their needs.
  • API Access
    Provides powerful API access for developers, facilitating integration with various applications and websites for seamless event management.
  • Analytics
    Offers analytics features that help users track event engagement and understand participant behavior effectively.
  • Add to Calendar Buttons & Links
    Let users instantly save events to Google, Outlook, Apple, and Microsoft calendars to increase attendance and engagement.
  • Subscription Calendars
    Keep audiences continuously updated with dynamic calendars that sync events automatically.
  • RSVP Tools
    Collect attendee responses and manage event participation through customizable RSVP pages.
  • Embeddable Event Calendars
    Publish branded event calendars on websites and landing pages without complex development work.
  • Recurring Events
    Easily manage repeating events, webinars, classes, and ongoing campaigns.
  • Timezone Localization
    Automatically display event times in each userโ€™s local timezone for a better global experience.
  • Marketing Integrations
    Connect with email marketing, CRM, and automation platforms to streamline event promotion.
  • White-Label & Branding
    Customize calendars, buttons, and RSVP experiences to match your brand identity.

Google Open Source features and specs

  • Community Support
    Google Open Source projects often have large, active communities that contribute to the software's development and provide support.
  • Innovation
    Google frequently publishes cutting-edge projects, allowing developers to utilize the latest in technology and innovation.
  • Quality Documentation
    Google Open Source projects generally come with comprehensive documentation, making it easier for developers to integrate and utilize their tools.
  • Scalability
    Many of Google's open-source projects are designed to scale efficiently, benefiting from Google's extensive experience in handling large-scale systems.
  • Integration with Other Google Services
    Open-source projects from Google often integrate smoothly with other Google services and platforms, providing a cohesive ecosystem.

Possible disadvantages of Google Open Source

  • Dependency on Google
    Being tied to Google ecosystems might lead to dependencies, making it harder for developers to switch to other alternatives.
  • Data Privacy Concerns
    Some developers are wary of data privacy issues when using tools developed by Google, given the company's history with data collection.
  • Complexity
    Googleโ€™s projects can sometimes be complex, requiring a steep learning curve for developers who are not familiar with their systems and methodologies.
  • Licensing Issues
    Open-source licensing can sometimes pose challenges, especially for companies trying to ensure compliance with multiple licensing requirements.
  • Longevity and Support
    Not all Google open-source projects have long-term support, and there is a risk that some projects may be abandoned or shelved.

Analysis of Google Open Source

Overall verdict

  • Google Open Source is generally regarded positively within the developer community due to its significant contributions to widely-used projects and its commitment to maintaining open and collaborative development practices.

Why this product is good

  • Google Open Source (opensource.google) is considered good because it hosts a wide array of high-quality projects that are well-maintained and actively supported by Google and the community. These projects often adhere to strong industry standards, providing reliable tools and libraries that developers around the world can use. Additionally, the open-source nature allows developers to contribute, inspect the source code, and modify it to fit their needs, which promotes transparency and innovation.

Recommended for

    This is recommended for developers looking for mature, scalable, and robust open-source solutions. Itโ€™s also ideal for organizations seeking to build upon a reliable foundation of tools, tech enthusiasts eager to learn and contribute to open source projects, and anyone interested in the collaborative world of software development.

AddEvent videos

How to Customize Event Landing Pages with Design Templates

More videos:

  • Tutorial - How to Create and Share Events with AddEvent
  • Demo - What is AddEvent? Our Event and Calendar Marketing Tools Explained

Google Open Source videos

No Google Open Source videos yet. You could help us improve this page by suggesting one.

Add video

Category Popularity

0-100% (relative to AddEvent and Google Open Source)
Event Management
100 100%
0% 0
Developer Tools
0 0%
100% 100
Event Registration
100 100%
0% 0
Open Source
0 0%
100% 100

User comments

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Social recommendations and mentions

Based on our record, Google Open Source seems to be a lot more popular than AddEvent. While we know about 26 links to Google Open Source, we've tracked only 1 mention of AddEvent. 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.

AddEvent mentions (1)

  • Help with Google Cal Zap (email users with specific ResponseStatus)
    For funsies, here's some absurdity we had to build to work around its shittiness. We've since abandoned all use of Google Calendar and fallen in love with AddEvent. Source: almost 4 years ago

Google Open Source mentions (26)

  • How I Got Into Google Summer of Code (GSoC) 2026 as a Tier-3 MCA Student
    Google Summer of Code (GSoC) is a global program run by Google where students and open source beginners get paid to contribute to open source organizations over a summer. You apply to a specific organization with a project proposal, a mentor reviews it, Google funds the selected contributors, and you spend the coding period working on real software used by real people. It's not an internship at Google โ€” the org... - Source: dev.to / 2 months ago
  • Sustainable Funding for Open Source: Navigating Challenges and Emerging Innovations
    Many companies that depend on OSS contribute financially so that the projects remain robust. Examples like Google and Microsoft have shown that corporate sponsorship is not only beneficial for maintainers but also for companies that rely on reliable software. The corporate sponsorship model moves away from traditional ad-based revenue generation, fostering a direct relationship between the sponsor and the... - Source: dev.to / about 1 year ago
  • Revolutionizing Blockchain and Open Source Funding: Microfunding and Project Funding Alternatives โ€“ A Comprehensive Guide
    Similarly, open source projects, which are the backbone of digital infrastructure, have long struggled to achieve sustainable funding. Crowdfunding platforms such as Kickstarter, Opencollective, and corporate sponsorships from technology giants like Googleโ€™s open source initiatives and Microsoftโ€™s commitment to open source are now offering viable alternatives. Innovators have begun to integrate Non-Fungible Tokens... - Source: dev.to / about 1 year ago
  • Funding Open Source Innovation: Empowering Sustainable Maintenance and Development
    Governments, academic institutions, and major tech companies like Microsoft and Google have recognized the importance of financial support. Funding models have evolved to include corporate sponsorships, grants (e.g., Mozilla's Open Source Support Program), and community-driven donations through platforms like GitHub Sponsors and Open Collective. - Source: dev.to / about 1 year ago
  • Revolutionizing Blockchain and Open Source Funding: Microfunding and Project Funding Alternatives
    Sponsorship Programs: Platforms such as GitHub Sponsors and offerings from tech giants like Google Open Source and Microsoft Open Source provide recurring support while maintaining community values. - Source: dev.to / over 1 year ago
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What are some alternatives?

When comparing AddEvent and Google Open Source, you can also consider the following products

Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

GitHub Sponsors - Get paid to build what you love on GitHub

Splash - Anyone can create a Splash event, whether you're a company hosting a single event or an individual hosting a personal event like a birthday or wedding. Get Started for Free. Text goes here. X. Full Event Program.

Open Collective - Recurring funding for groups.

DoubleDutch - DoubleDutch creates mobile applications designed to capture and surface data from live events and conferences.

Disney Open Source - Explore Disney's Open Source projects