Like someone else said, it used to be really worth while. I used to get 150 biscuits once a week as well as my daily ones for walking my 2 dogs. Tesco £10 vouchers cost 850 biscuits. Not anymore, you either get 5 biscuits per day per dog or pay £3.99 to pay for the app. It would take me about 4 months to get a £10 voucher!. I have exchanged biscuits for my last voucher and I have now uninstalled the app! NO THANK YOU!