Your country: US
Reward types: Gift vouchers
Incentives per survey: $2 to $5 (and up to 50 US$ for specialist surveys)
Cash out: from $20
Number of invites: about 12 surveys in a month
Age to join: from 16 years
Prize draws: New member prize draw for electronics (e.g. iPod touch)

Your country: US
Reward types: Gift cards
Incentives per survey: 0.01 to 5 US$
Cash out: from 10 US$ (4,200), 25 US$ (10,000 points)
Number of invites: about 10 surveys in a month
Age to join: from 18 years
Comments: A starting credit of 100 points for registration and 200 points for completion of the personal profile information

Your country: US
Reward types: money, gift cards and items
Cash out: Amazon gift card for a value of $5
No. of invites: continuously throughout installed software
Age to join: from 18 years with all devices
Comments: Amazon gift card of $5 if kept as an active member for only a week, additional credits every week, which can be redeemed for more gift cards from Amazon, your participation (for at least 90 days) will also be recognized with donating a tree.

Your country: US, Canada, UK, Australia, Singapore, Hong Kong, Ireland, New Zealand, South Africa, India and 35 more countries
Reward types: Cash
Incentives per survey: 0.50 to 4 US$
Cash out: from 10 US$
Number of invites: about 30 surveys in a month
Age to join: from 16 years
Comments: Access to our own survey online panel to participate daily in paid surveys, as well as a huge range of other earning opportunities: tasks, micro jobs, apps, discover offers and more