The battle between Zoopla and OnTheMarket continues in full spate, with the former claiming that OTM is struggling with traffic and that its cost per lead is over £50 – making it the “most costly and least effective marketing channel in UK property portal history”.

Zoopla also says it has welcomed back “dozens” of agents who have defected from the new portal.

Citing Hitwise figures, Zoopla says traffic to OTM fell 13.5% in April.

OTM has rubbished the claims.

Zoopla’s full press release says: “With three full months since the launch of OTM and despite some bold predictions and noisy PR, the latest data shows that the new portal is struggling to establish any meaningful audience levels with traffic falling by 13.5% in April, according to independent web monitoring firm Hitwise.

“Even using OTM’s recently released internal data of 3.5m visits in April and 10m visits since launch leads to the same conclusion of falling or static traffic as it implies around 6.5m visits over the first 2 months with little or no growth in April.

“During the period since the launch of OTM, ZPG has enjoyed a monthly average of over 46m visits versus just over 3m for OTM.

“Based on publicly available traffic data, membership rates, inventory levels and average lead conversion rates the average cost per lead for OTM members is currently estimated to be in excess of £50 compared to an average of less than £3 for ZPG members, likely making OTM the most costly and least effective marketing channel in UK property portal history.

“Lawrence Hall of Zoopla Property Group said: ‘OTM has delivered the same audience in three months that ZPG averages in under a week but is charging similar advertising rates. Its members are paying more than 15 times the fair market value for their digital marketing currently which is simply not sustainable for most.

‘Property portal fees must align with exposure and enquiries and no business can afford to be paying way over the odds for under performance for an extended period of time.’

“OTM needs to grow its audience very substantially and quickly to get anywhere near their prediction of catching ZPG by the end of the year and the latest data from both Hitwise and OTM itself shows that this is simply not realistic. In the meantime, charging its members a more realistic rate of around £20 per month, as ZPG did when its traffic was at similar levels, would seem fairer whilst they try to build their audience.

“We have already welcomed back dozens of members who have already become disillusioned by the unrealistic promises made and fees they are being charged and we will continue to welcome back any other agents who are interested in ensuring they are getting the best value for their marketing spend.”

Ian Springett, chief executive of OTM, said: “Another week and yet another inaccurate and speculative press release from Zoopla.

“It is a fact that less than 10% of the agent members of OTM   have chosen Zoopla as their other portal. And it is a fact that the Hitwise figure showing a reduction in traffic of 13.5% in April is wrong.

“OTM and Zoopla both use the same performance measurement tool, Google Analytics, for external reporting and it is a fact that far from declining, the traffic to OTM has continued to increase month on month since its launch in January 2015.

“Furthermore, it is a fact that traffic levels have remained buoyant in May to the extent that OTM has just experienced its highest ever number of weekly visits.

“To date, our users have viewed an average of 9.3 pages and spent an average of 6.5 minutes per visit – figures which compare well with other major portals.

“With membership now at more than 5,000 offices and growing every day and with more than 27% per cent of member offices uploading their properties to OTM ahead of any other portal, OTM is already a must-view website for the key audience of serious property-seekers.

“Members continue to tell us that leaving Zoopla has made no difference to their instruction-winning capability and that they are receiving at least as many good quality leads from their overall online presence as before. They report that the property-seekers they talk to are enjoying the clear and elegant search experience and the faster response times offered by OTM while vendors and landlords appreciate the quality of presentation of their properties and the absence of spurious and unhelpful data and distracting advertising around them.​

“OTM is owned and supported by thousands of estate and lettings agents via Agents’ Mutual. In attacking it by the issue of misleading information, Zoopla has shown how little it understands the strategic motivation and commitment of those agents to creating a superior market-leading property search service.

“Zoopla should be in no doubt:  OTM is here to stay and we remain confident in becoming the number two portal by the end of January 2016 on our way to achieving our medium term objective of challenging the market leader.”

MonthlyChart HItwise(1)