I’m going to share thoughts about how things could be better in a minute, but you need to understand just how wonderful this app is. You can quickly enter any recipe, and scale it from a half-measure to a single, double, triple, four-ple or five-ple. ;-) In Imperial or metric. There’s a place to enter the source, and you can always go into the recipe and edit the appearance. I’m in the process of doing this: yellow for whisk(e)y-based cocktails, green for gin, red for tequila, etc. Just go download it and see. If you don’t like it, delete it and they will send you five-ple your money back - BECAUSE IT’S FREE!!!
Now, let’s consider improvements. Sorting by base spirit. Sorting by title of drink. Sorting by source. Easier - um, I mean, actually existent - import/export. Collecting drinks together into groups to send to others. Adding drinks from someone else and having a “Friend’s Bar Book” section. Having (in-app) friends to share with. Easily sharing a recipe via social media or print. Rating cocktails. Having riffs off drinks (all riffs would link back to the base cocktail.) Favorites/ratings system for drinks. I could think of others, given more time and cocktails.
These things will probably never happen. The iOS App Store reviews area is alive with people begging for their list of improvements like mine above. But don't think for a minute that this is not a first-class, Studio/Neat-level piece of software. It's clean, feature-rich (sorta), and neat. You should just go get it for free right now. I'm serious.