An online estimate reads public records: lot size, square footage and the last sale date. It has no way to know whether a basement was finished with a permit, whether a roof was recently replaced, or whether a busy street quietly discounts the house next door.
A REALTOR® fills that gap by pulling actual sold comparables from Saskatchewan REALTORS Association data, in a market currently running at 1.63 months of supply, and adjusting for differences a computer cannot see before walking the property in person.
The right person to run your numbers is whoever will actually walk through the house, not just query a database. Get your hand-reviewed valuation from Joel Dyck.