It is worth noting that this app is different from a guide to bars. Good spots will not show up if they have pedestrian beer selections. At the same time, bars do not automatically get good ratings for having lots of choices. Mr. Bernstein acknowledges that the Beer Authority, a 70-tap bar that recently opened on a stretch of Eighth Avenue in Midtown Manhattan, is “a life preserver for folks working around the Port Authority.” But the app still sticks it with a 2 out of 5 rating because of its unimaginative décor, high prices and a tendency to play lame music.

Mr. Bernstein updates the app with newly opened establishments, and it also has a news tab that includes bulletins on things like how to ensure that an I.P.A. is fresh, or how to help out beer-related businesses affected by Hurricane Sandy. An Android version is due out in early 2013.

One of the more popular beer apps is Untappd, a location-based social-networking app for beer drinkers (free and available for Android and iOS). The app is designed to get people to share their impressions of beers, keeping track of what they liked while also guiding friends and strangers to good bars and brews. The app has an active community, but like any crowdsourced project there is a lot to sift through to find anything useful.

Another way to find new beers to try is to tell an algorithm what you drink and have it determine what else you might like. BrewGene is a nice version of this idea (free and available for Android, iOS or on the Web). It has a truly extensive database. I recently ordered a Goose Island I.P.A. from a bar, but when I went to enter it into the app found that there were five different beers with that name. I rated a few beers from the app’s top 100 list, and it began generating credible suggestions for me. The app’s ability to point me toward an establishment that would serve me these beers is lacking, however. Its “Places” function pulled in a seemingly random selection of nearby bars, bodegas and restaurants. There’s supposed to be a beer menu for each establishment, but all the ones I got were blank.