One integration. Dozens of address books.
Zero hassle.

CloudSponge allows your users to share without ever needing
to remember, type, or upload emails manually.

  • Instantly integrate with dozens of address books

    We support Gmail, Outlook.com, Yahoo and dozens more.

  • Absurdly easy install

    Deploy in minutes, not weeks.

  • 100% maintenance-free for you

    Dedicated monitoring and support since 2010.

  • Fully customizable

    Edit any part of the experience with our JavaScript options and callbacks.

  • Secure, private, and fully compliant

    Audited and approved to stringent standards.

 
Try It With My Address Book

No sign up required.



Start With A Sandbox Account

Tinker in your test environment for
as long as you need. No credit card required.

Why do the dev teams at these world-class companies choose CloudSponge?

  • Airbnb
  • Nextdoor
  • GoFundMe
  • Lyft
  • Yelp
  • Patreon
  • InVision
  • Morning Brew
  • Gain Fully
  • Kiva
  • Greenvelope

Because everybody hates manually adding their contacts.

Because everybody hates manually adding their contacts.

None of the top referral, e-card, e-vite, or fundraising platforms make users type in emails or mess with CSV files.

Add our Address Book Widget to your recipient form and allow users to search, select and share contacts without leaving your website.

Try It With My Address Book

Risk-free: your contacts will not be saved or emailed.

Because building it yourself doesn’t make any sense.

Because building it yourself doesn’t make any sense.

You could invest hours learning dozens of APIs and CSV formats, digging through docs, and chewing through spaghetti code…

then play “integration whack-a-mole” every time something breaks.

Or, deploy our Address Book Widget today, go to market faster, and focus on building what users want – without ever worrying about address book integrations again.

How often do we make fixes and updates? See for yourself in our changelog.

If we were to build and maintain this technology on our own, it would likely cost us roughly 30 to 50 times the cost of using CloudSponge.

Walter Turner

Vice President of Product at Spokeo

Because the ROI is massive

Here’s what happens when users don’t have to type, remember, or manually upload addresses to import their contacts…

At least two times the people are getting a referral email now...Think about that. Obviously, having CloudSponge is hugely beneficial for us.
Austin Reif

COO of Morning Brew

CloudSponge has been an important driver of viral member growth because it allows those who are motivated to invite to do so in bulk.
Ben Springwater

Product Manager at Nextdoor

From a development perspective it was amazing to get all the different data sources integrated into the product with just one actual development integration for our team.
Cameron Nordholm

CEO of Gainfully

See More Customer Stories

Because security and privacy are too important to risk.

Because security and privacy are too important to risk.

Your customers and their contacts are critical to your business. We take that extremely seriously.

That’s why contacts are never saved to disk.

And why we’ve implemented stringent physical, operational, and software security measures that have passed dozens of audits.

Review Our Security Measures

Try CloudSponge for free in your
testing environment

Get a Free Sandbox Account

Have a questions or prefer a guided tour?
Schedule a consultation with our Founder.