Collaboratory can be used with up to two participants for free.

 

An in-app purchase

($ 17.99 / £ 17.99 / € 19.99)

allows for unlimited participants.

 

Choose the in-app menu Collaboratory → Purchase… to purchase.

The client app ”Collaboratory Client” for submitting ideas is available as a free download on the App Store and on the Google Play store. 

 

Participants can also submit notes using a built-in web interface which doesn’t require installing anything.