OnTheMarket is making its mark, Guardian Money has reported.

The paper said at the weekend that the new portal “is challenging the dominance of Rightmove and Zoopla – and it is Zoopla that is losing out most”.

Patrick Collinson’s report says: “Guardian Money this week tested the three sites, checking the number of properties they each list in various locations around the country, and found that the launch of OnTheMarket is already having a striking impact.

“For example, in Harrogate, Zoopla was this week listing only 138 properties compared with 343 on OnTheMarket and 529 on Rightmove.

“But in Exeter, OnTheMarket could only muster 171 properties compared with 719 for Zoopla and 726 for Rightmove.

“In some parts of the country OnTheMarket is virtually invisible, such as Bury in Greater Manchester, and Dundee, where we found it listing a tiny fraction of the properties available on the other sites.

“But in one location, Aberystwyth, OnTheMarket had more properties than either of the other two.

“Zoopla points out that sites may use different definitions of a town area, which will affect the listing numbers.”

The report continues: “Guardian Money also tested the total number of properties available on Zoopla before and after the launch of OnTheMarket.

“On 19 January, a week before the launch of its rival, Zoopla was listing 325,956 properties for sale in England. On 4 March it was listing 265,231, a fall of 19%.”

The report quotes both Alex Chesterman of Zoopla, and Ian Springett of OnTheMarket.

According to Chesterman: “Consumers should be outraged at OnTheMarket with its restrictive and regressive practices. Why would a seller be happy to exclude potential buyers? They will lose out as they will not get the best possible price for their property.

“It is why three out of four agents have decided not to go with OnTheMarket, and why there is three times as much inventory on Zoopla than OnTheMarket.”

But according to Springett: “The figures being quoted by Zoopla with regard to traffic levels at OnTheMarket.com are simply inaccurate.

“This is an attempt by Zoopla to intimidate agents who have chosen to remove all of their properties, and corresponding advertising expenditure, from them to list with OnTheMarket.

“We have also been told by many member agents that having removed their properties, it has become obvious just how many leads were previously duplicated, and that leaving Zoopla has had no impact on their business.

“Suggesting sellers may not get the highest price for their home because of less market exposure is a complete myth without any foundation.

“There is no getting away from the fact that Zoopla has suffered major losses in the numbers of agent customers they have, and the numbers of available properties they list.”

The Guardian report is here