FixBot walks you through a problem step by step. We've all been there: You can't (or won't) get help when something breaks, but the YouTube clip doesn't cover your specific issue. It's what repair gurus at iFixit want to solve with FixBot, an AI-enabled app that talks you through whatever repair you're doing. The chatbot will help you diagnose the problem and then walk you step-by-step through the fix. Plus, it's voice-enabled so you won't have to get your phone all smeary when you're elbows-deep in a job.

Piction Health's app can help doctors classify a range of skin conditions. Piction Health, founded by Susan Conover SM '15, uses machine learning to help physicians identify and manage skin disease. When Susan Conover wanted to get a strange-looking mole checked out at the age of 22, she was told it would take three months to see a dermatologist. When the mole was finally removed and biopsied, doctors determined it was cancerous. At the time, no one could be sure the cancer hadn't spread to other parts of her body -- the critical difference between stage 2 and stage 3 or 4 melanoma.

Sushi is only as good as the fish wrapped inside its barrel of rice and seaweed. If the tuna, yellowtail, or salmon isn't fresh, it not only looks gross, but renders the whole roll underwhelming in flavor and texture. To keep things from getting fishy, a Japanese company has developed a new mobile app that uses artificial intelligence to grade the freshness of cuts of tuna on sight. Aptly named Tuna Scope, the system uses thousands of cross-sectional images of tuna tails as training data to learn what good quality tuna looks like. According to the Tuna Scope website, trained fishmongers use the tuna tail as a "road map" detailing the fish's flavor, texture, freshness, and overall excellence.

A new app is trying to make it simpler to help you react to photos and videos that your friends post online--it's using AI to capture your facial expressions and automatically translate them into a range of emoji faces. Polygram, which is free and available only for the iPhone for now, is a social app that lets you share things like photos, videos, and messages. Unlike on, say, Facebook, though, where you have a small range of pre-set reactions to choose from beyond clicking a little thumbs-up icon, Polygram uses a neural network that runs locally on the phone to figure out if you're smiling, frowning, bored, embarrassed, surprised, and more. Marcin Kmiec, one of Polygram's cofounders, says the app's AI works by capturing your face with the front-facing camera on the phone and analyzing sequences of images as quickly as possible, rather than just looking at specific points on the face like your pupils and nose. This is done directly on the phone, using the iPhone's graphics processing unit, he says.