So this is cool. Alltheflavors.com has implemented active inventory tracking on the site. This means, once you've added all the flavorings you own into your "My Flavors", any recipe you mix from the site (as long as you create a batch), the appropriate measurements will be tracked. This allows much better upkeep on flavorings making sure you never run out.

I made a video showing you how to use this feature.

/u/queuetue has also said that more features are to come. One being Alerts. So alerting you when you've passed a specified threshold on a flavoring, as well as easier mass-flavoring addition. Some of us with very large inventories might find it far too tedious to manually input all of them. Go check it out, it's pretty damn useful.