OnTheMarket has announced its one millionth unique visitor.

The site, which acknowledged “the PR battle” before launch, also reiterated its claim that 90% of its member offices have chosen to retain Rightmove as their “one other portal”.

The site, which launched on January 26, last night gave a marked nod to media owners with interests in other portals.

OnTheMarket’s new update to members said: “The PR battle in the run-up to launch was difficult as it was possible for our rivals (especially commentators and/or media associated with Zoopla) to make unsubstantiated assertions about your company, e.g. it would fail to attract agents/funding; it was anti-competitive; it would not be a credible portal; it would not launch on time; etc., etc.

“Since the launch of OnTheMarket.com, it has been possible for us to engage more fully, and many journalists have a greater appreciation of what is at stake and the scale and strength of our market entry.

“Our voice is being heard.”

The update also said OTM has now surpassed the 4,700 office mark, with more still to be added as their contracts with other portals expire.

In the update, chief executive Ian Springett said that more than 4,300 of the 4,700 are contracted for five years as Gold or Silver members.

However, Springett also admitted that the launch threw up “considerable operational challenges”.

He said: “A small proportion of members did not get the service they rightly expect, and if yours was one of these firms then please accept my apologies and my commitment to make things right.

“Feedback from members, (unbiased) commentators and the public about your new portal has been universally positive.

“The clean and clear presentation of search options, search results and your property details differentiates OnTheMarket.com from its rivals.

“The benefits of a fully-responsive design which adapts to device screen size is now evident to all. The portal is lightning-fast, delivers search results in precisely the format the user chooses and presents your properties in the best possible light.

“The presentation is geared to encouraging buyers and tenants to contact you about the properties you are marketing in whatever manner suits them best – this is our purpose.

“The portal we launched with has already been improved significantly in response to member feedback.

“We are now delivering continuous improvements, both small and large, to ensure OnTheMarket.com becomes the favourite portal for our member agents and the property-seeking public. One of the benefits of the state-of-the-art platform we have built is that we can react rapidly when change is needed.”

He said of OnTheMarket’s immediate rival: “As a result of the choices made by our members, Zoopla has already lost large amounts of property stock to OnTheMarket.com.

“Zoopla is currently using outdoor/ buses/ taxis and radio, media which we believe are targeted primarily at agents. It has not advertised on TV since October.

“We have plenty of examples of areas where OnTheMarket.com already has stronger available property stock than Zoopla, and some examples where it has more stock than Rightmove in those few areas where members have retained Zoopla.

“The swing to OnTheMarket.com is increasing all the time as we continue to grow membership.”

Springett said that the objectives remain to become the number two portal “as rapidly as possible” and to “build to become a credible alternative to the No. 1 portal”.

He said that the plan is to replace Zoopla as the number two portal by January 2016.

Springett also urged a collaborative movement, asking member agents to advocate OTM wherever possible and to continue co-branding and local promotion.

He also asked member agents to use Earlybird for all new properties.

The update ends: “We will be doing everything we can to support your business as we drive OnTheMarket.com forwards.”