IDX vs VOW

IDX and VOW are the two ways MLS data reaches an agent’s website, and they answer different questions. IDX (Internet Data Exchange) displays active listings to every visitor with no login. VOW (Virtual Office Website) adds sold prices and off-market history for visitors who register and accept terms of use. DDF, often mixed into this decision, is CREA’s national realtor.ca feed and is a different tool again. For most Ontario agents the practical answer is: run IDX and VOW together on one site, and treat DDF as an option for breadth, not depth.

IDX: the public layer

IDX is the reciprocity framework that lets a licensed agent display their board’s active listings on their own public website. No visitor login, no wall, fully crawlable, which makes it the layer search engines index and the layer casual browsers touch first. Its limits are just as clear: active listings only, a defined subset of fields, and on TRREB a materially smaller slice of the database than the VOW feed carries. An IDX-only site is a storefront window. Useful, but every portal has the same window.

VOW: the registered layer

A VOW turns the anonymous browser into a named, registered visitor and in exchange may show them the rest of the story: what properties actually sold and leased for, terminated and expired cycles, and richer history. The conditions are registration, click-wrap terms acceptance, and expiring passwords, all enforced server-side. The commercial effect is that the single most-demanded dataset in Ontario real estate, sold prices, becomes something your website can offer and your competitors without a VOW cannot. The full operator’s view is on the VOW website page.

The three-way comparison

The row that decides most Ontario practices is sold prices. Only the VOW row has it.

Where DDF fits

DDF (CREA’s Data Distribution Facility) is a permission-based feed of realtor.ca listings that can put active listings from many Canadian boards on one website. Its participation is opt-in per board and brokerage, so it is broad but not complete, and it carries no sold data at all. For a GTA-focused practice, a direct TRREB feed is deeper and fresher and includes the VOW lane DDF will never have.

Honesty note about our own stack: BrokerFold does not consume DDF. Our sites run on direct board feeds (TRREB today, via PropTx’s RESO Web API), because direct feeds are what make minutes-fresh data and sold history possible. If your practice genuinely spans many provinces, a DDF-based site is a legitimate choice; weigh the breadth against losing the sold-data layer.

Run both: the standard Ontario setup

The IDX-or-VOW framing is mostly false. They are complements: IDX is the public, indexable surface that brings traffic in; the VOW wall is the conversion mechanism that turns the serious fraction of that traffic into named leads. A BrokerFold site runs both feeds on one domain, with active listings public and sold listings behind the free registration wall.

Which do you need? A quick decision guide

• New agent, tight budget, building a first web presence: start with both anyway if your platform includes VOW at no extra tier, as BrokerFold pricing does. There is no scale threshold below which sold data stops converting.
• Established GTA agent competing with portal-addicted clients: VOW is the point. Your clients already use a sold-data site daily; the only question is whose.
• Practice built on out-of-province referrals: consider DDF-based breadth, and accept its limits knowingly.
• Team with an ISA or follow-up process: VOW registrations are the input that process is starved for. Pair the wall with routing and see what a VOW is if the mechanism is new to anyone on the team.