OneKey™ MLS is New York’s largest Multiple Listing Service has the most accurate and reliable property listings to search from when buying or renting because we are the source. Buyers and sellers turn to OneKey™ because we have more of what they need – all in one place. Our MLS serves communities from Montauk to Manhattan and up to Monticello. We are 40,000 REALTORS® strong and growing.


- Find homes near you using your device's built-in GPS locator.
- Get driving directions on the go.
- Complete and current access to all active MLS-listed homes for sale.
- Large color photo galleries with expanded listing details, at your fingertips.
- Search by city, ZIP code, price, style and more.
- Find open houses near you.
- Access your personalized home search account from
- Save favorites on your phone and share them with your friends via e-mail.
- Updated regularly with the newest homes on the market.
- Search foreclosures and recently sold homes.

What’s New

Version 5.904.200717

MLSLI is now OneKey™ MLS.
OneKey™ MLS gives you more listings, more choices, and more opportunities to find your dream home!

Real estate is not just a transaction. It’s about something more profound: life, family, business and prosperity. It’s often the single largest investment for consumers; and for brokers and agents it’s their very livelihood. With so much at stake – consumers need ready access to data and tools that are beyond reproach.

While there are a number of new entrants and trendy brands in the market, it pays to go right to the one place that is the most trusted, the most reliable and the most comprehensive source of real estate listings and information. That’s why informed buyers and sellers, brokers and agents all turn to OneKey™ MLS. Our new MLS provides the platform that has more of what everyone needs – all in a single place.

More is more. With the expanded size and scale made possible by the merger of MLS Long Island and the Hudson Gateway MLS, we are 42,000 REALTOR® subscribers strong and our geographic footprint spans from Montauk to Manhattan and through the Hudson Valley, up to the Catskill Mountains.

Our vision goes beyond just having reliably updated property listings: We are excited to reinvent what it means to be a multiple listing service by fulfilling a simple promise: “to give our members more coverage, better data and the best tools to help them have a better business.” We are all stronger because we work together to build a trusted network of people, and we are anchored by our deep commitment to the highest industry standards. We strive to ensure success at every phase of the customer journey from consideration to close.

Being “The One” source for all things real estate is a responsibility we take to heart. Being on top means staying on top and committing ourselves to honesty, integrity and the fulfillment of dreams – because that’s what we do every single day.

OneKey™ MLS
The One

Ratings and Reviews

4.7 out of 5
1.8K Ratings

1.8K Ratings

aphrase ,

Rental queries broken

The app no longer show results in the rentals searches for some reason. Even as general search with no specific criteria.

Missmaryxo ,


Was great, ever since the update from mls to one key it doesn’t actually save the homes I save! Making it a PIA. I found a slight work around where I just email the listings I want to save to myself but it would be nice if hearting something actually saved. I saved a ton of listings I was to check out and my whole list was wiped and hearting just doesn’t work at all anymore

DKG111994 ,

Poor functionality

App always worked great until a few weeks ago when I updated the app. Old listings are being shown with old open house dates. Listings that are not on the market are showing on the app, and not the website. School district does not appear, and floor plan descriptions no longer appear.
Please update. This has made house searching quite difficult.


Multiple Listing Service of Long Island, Inc.
96.6 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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