Inventory Planner by Sage

This app is a blessing, I can't recommend it enough! It's saves us hours of admin every week, its great for our accounting, our stockists love it and it's even reduced errors. By my our calculation this app paid for itself in the first week we used it, and pays for itself every month within the first day - it's that efficient. It's also given us great insight into our stock holding. The team behind it are also superb, their support and responsiveness are the best we've come across.