HouseSigma and Realtor.ca are the two tools most Ontario buyers live in, and they do different jobs. Realtor.ca is the official public listing site from CREA, showing active homes for sale. HouseSigma layers on sold prices, price history, and its own estimates, but you need a free account to see them. Most serious buyers end up using both.

What is the difference between HouseSigma and Realtor.ca?

Realtor.ca is run by the Canadian Real Estate Association (CREA). It is the public face of the MLS system, so it shows active listings across the country in one place. It is free, needs no account, and it is where most listings appear first.

HouseSigma is a private platform (and a brokerage) that pulls listing data and adds features Realtor.ca does not: sold prices, days on market, price drops, and an automated estimate of what a home might be worth. To unlock the sold data and estimates, you sign in with a free account.

In short: Realtor.ca answers "what is for sale right now," and HouseSigma leans into "what did homes actually sell for, and what might this one be worth."

Here is how the two line up side by side.

HouseSigma vs Realtor.ca for Ontario buyers

  • Who runs it. HouseSigma: Private platform and brokerage; Realtor.ca: CREA, the official listing site
  • Active listings. HouseSigma: Yes; Realtor.ca: Yes, the primary source
  • Sold prices. HouseSigma: Yes, behind a free account; Realtor.ca: Not shown to the public
  • Home value estimate. HouseSigma: Yes, automated; Realtor.ca: No
  • Price and listing history. HouseSigma: Yes; Realtor.ca: Limited
  • Account required. HouseSigma: Yes, to see sold data and estimates; Realtor.ca: No
  • Cost. HouseSigma: Free tier, with paid upgrades; Realtor.ca: Free

Source: Zown Realty, Ontario 2026

Which one has more accurate and fresher data?

Both draw from the same underlying MLS listing feeds, so active-listing details tend to line up closely. Realtor.ca is often where a listing shows up first, since it is fed directly through the CREA system.

Where accuracy gets tricky is with HouseSigma's two headline features: sold data and estimates. Sold prices are real transactions, which is genuinely useful. But how quickly they appear, and whether every sale shows up, can vary. Estimates are automated guesses built from past sales and patterns, not appraisals. They can be a helpful starting point and still be off on a specific home, especially for unique properties or fast-moving areas.

So treat HouseSigma's estimate as a rough signal, not a price tag. And remember that a "sold" figure does not tell you the full story of the deal, such as conditions, included items, or how many offers there were.

2 tools, 1 blind spot

search sites show listings and past sales, but not the live brokerage context behind a specific deal

Do you need an account to use them?

This is a real difference for privacy-minded buyers.

Realtor.ca lets you browse active listings with no account and no sign-in. You can search freely and only create an account if you want to save searches or favourites.

HouseSigma requires a free account to see the features people come for, namely sold prices and estimates. That means handing over an email and agreeing to their terms. It is free, but it is not anonymous. If you would rather not sign up, Realtor.ca covers active listings without the login.

What can each tool show, and where do they stop?

Both are excellent at the top of the buying journey: browsing, comparing, and getting a feel for prices in a neighbourhood. That is real value, and there is no reason to stop using them.

Here is where both tools stop:

  • Live deal context. Neither can tell you in real time whether a seller is motivated, whether an offer date has moved, or whether a listing is about to be relisted at a new price.
  • The story behind a sold price. A sold number does not show the conditions, the deposit, the closing date, or how competitive the offer was.
  • Whether the estimate fits this home. An automated value cannot walk the property, notice a foundation issue, or judge a strange floor plan.
  • What to actually offer. No app writes your Agreement of Purchase and Sale (OREA Form 100), structures your conditions, or negotiates for you.

That last mile is where a licensed agent with brokerage tools and local read on the market fills the gap. If you want a framework for digging into a specific property, see our guide on how to research a home before offering.

How does an agent see more than these tools?

A REALTOR® works inside the full MLS system, which carries more detail than public sites choose to display, and they can pull comparable sales, listing histories, and status changes with context. More importantly, they add judgment: reading why a home is priced the way it is, spotting red flags, and knowing what similar homes truly traded for and why.

When it comes time to act, that judgment turns into a strategy. An agent helps you decide what to offer, which conditions to keep, and how to structure a deposit held in trust. Our walkthrough on how to make an offer in Ontario shows how those pieces fit together.

How does Zown fit with the tools you already use?

You do not have to give up HouseSigma or Realtor.ca to work with an agent. Keep browsing where you are comfortable. Zown simply adds the guided, human layer on top.

Zown is a registered brokerage (Zown Realty Inc., Brokerage, regulated under Ontario's Real Estate and Business Brokers Act, 2002 and RECO). Our agents are salaried, so their advice is not driven by a commission on your purchase. That means when you bring a listing you found, the guidance you get is about your decision, not closing a deal.

On top of that, Zown gives buyers cash back through the Down Payment Boost: up to 1.25% of the purchase price, to a maximum of $25,000. On an $800,000 home that is roughly $10,000. It is paid to you at closing, into your savings, where most buyers put it toward closing costs and the expenses that follow moving in. If you are early in the process, our first-time home buyer guide for Ontario lays out the full path.

See what your Down Payment Boost adds up to →

Reviewed by Arjun Dhawan, Head of Account Management and REALTOR® at Zown Realty Inc. Last updated July 16, 2026. General information, not legal or financial advice.