Challenger portal is inviting agents to pre-register ahead of its full launch in two months' time, and has welcomed competition from Michael Bruce's new venture, Boomin.

OpenBrix founder Adam Piggott says two of the big estate agency CRMs are hindering his and other portals' progress as they sign up agents and try to list their properties.

After nearly two years of development and financing the first agents are now using its 'secure ledger' tech with more to join soon.

OpenBricks says its unique networking technology will enable agents to vote democratically on every aspect of its operation including fee levels and marketing expenditure and will cost £100 a month per branch.