(Bloomberg) - The new mobile app "Wine Ring" sounds great: With the help of secret, patented algorithms, it can predict whether or not I’ll like a wine before I buy it.

It’s the latest in a series of apps that all swear they’ll solve your myriad wine-related problems—even ones you never knew you had.

I’m a skeptical non-techie, so I spent last week testing out Wine Ring, the just launched Omnipair (which aims to help you pick the right wine in a restaurant), and the latest versions of a dozen other wine apps to see what, exactly, they deliver. Several stood out as worth downloading; others seriously underperformed.

Hundreds of wine apps are on the market, offering everything from help pronouncing arcane wine names (Say Wine, launched last month), to calculating wine tax on a bottle you’re buying in a U.K. supermarket (UK Wine Tax Calculator). There are to maps to locate wineries (Winery Passport), and even, in the most recent summer, Pokemon Go for California wine country.

Only a tiny number lead you to wines you’ll probably enjoy drinking, at a price you want to pay, with an easy to use format and a simple way to buy. Here’s what I thought of the top contenders.