Notebox Lite is perfect for freelancers with low usage and is very cost effective. Notebox Stacked has no limits and contains pro features such as company branding/customisation and advanced CSS editing.
Need to get a design concept to a Client and get feedback quickly, well it could not be easier than with Notebox. Upload your design to Notebox, send the client a URL ( long and short versions available). The client simply goes to the URL with their browser, then adds notes to any part of the design. You get an email saying they have left notes, login to you account and review the notes.