One easy widget. Dozens of address books.
Zero hassle.

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

  • Fast and Easy Install

    Integrate with Gmail, Yahoo, Outlook.com and more in minutes, not weeks.

  • Dedicated Support

    Actively monitored, maintained and supported since 2010.

  • Completely Customizable

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

Trusted by…

  • Airbnb
  • Nextdoor
  • GoFundMe
  • Lyft
  • Yelp
  • Patreon
  • InVision
  • Morning Brew
  • Gain Fully
  • Kiva
  • Greenvelope
Start With A Sandbox Account

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

See how easy CloudSponge is for users.
Try it LIVE below!

  1. Use the “Add From Address Book” button below to launch the address book widget.
  2. Connect any of your address books. Don’t worry—your contacts are NEVER saved to disk.
  3. Select a few contacts and push “Get X Contacts”. Nothing will be sent or stored, this is just a demo.
     
     
     

    Add From Address Book   (Demo Only!)

    This textarea has class='cloudsponge-contacts' to tell our widget that this is where we want the contacts to be inserted. It doesn’t have to be a textarea, it can be any type of HTML element, a JavaScript function, or a webhook.

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Remember: you can customize ANY part of this experience with our JavaScript options and callbacks.

That seems easy enough.<br/>Why not just build it myself?

That seems easy enough.
Why not just build it myself?

Why do the talented dev teams at Airbnb, Yelp, and more choose CloudSponge over DIY?

  • Lower costs
  • Faster time-to-market
  • Infinitely scalable
  • No lost dev time

You could invest hours learning dozens of APIs and CSV formats, digging through docs, and playing integration whack-a-mole every time something breaks.

Or…

Use CloudSponge to integrate with every major address book in minutes. We’ll handle the maintenance, and your developers can focus on building what users want without worrying about address book integrations ever 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

The fastest ROI multiplier on the planet. Seriously.

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

We take security and privacy seriously.

We take security and privacy seriously.

Your customers and their contacts are critical to your business. Protecting both is non-negotiable.

That’s why contacts are never saved to disk.

And why we’ve implemented layers of 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.