
From today (17 February), SeeSaw will offer more than 3,000 hours of free on- demand TV content, including programming from broadcast partners Channel 4, Channel Five, BBC Worldwide.
Today's launch follows a month's beta trial, when it was tested by 20,000 people.
The new service has failed to secure a deal with the UK's biggest commercial broadcaster, ITV, but chief executive Pierre-Jean Sebert, said today "the door for ITV is always open".
SeeSaw's service will also include sporting archived content from the Olympics, following a deal with the IOC, and is in talks with set-top box and games manufacturers to embed the service into TVs and consoles as one of several routes to market.
An additional 2,000 hours of paid-content is also expected to be added to the free ad-funded service in the coming weeks, as SeeSaw expands into music, sports and kids' programming.
The paid content will include a pay for view streaming service and a subscription model – but will not include films.
In the future, SeeSaw will also be looking at integrating social media and adding sharing functions as a way to engage customers.
Sebert said: "We plan to make SeeSaw the household name in the UK. It will be the home for long-form premium content. We will keep our promise to be the best of TV."
SeeSaw's launch will be backed by a £5m marketing campaign from 26 February, which will include an animated teaser campaign on Channel 4, E4 and More4 to build brand awareness.
The teaser campaign will be the first of three executions created by Fallon, with media planning and buying being handled by Vizeum.
Arqiva unveiled 17 launch advertisers, including pre and mid roll ads for Cadbury, Nivea and Sainsbury's.
Content now available on www.SeeSaw.com includes 'Home and Away', 'Neighbours', 'Footballers' Wives', 'Bad Girls' and 'Grand Designs'.