context: Workout trackers that you wear on your wrist or arm can completely overhaul your exercise routine. They make you more aware of when you move and inspire you to keep stepping it up. Combine your device with the right app and you may see even more results. Most people who lose weight and keep it off use food diaries. Just the act of logging what you eat inspires you to eat healthier. You'll take your weight loss efforts to a new level when you pair a food tracker with your fitness device. Some devices, like those from Fitbit, Larklife, and Jawbone, have a way to track what you eat on their own web sites or apps. Most of the ones that don't have their own food trackers sync with apps that do. Even the devices with their own food tracking often sync with apps that allow you to see more details about nutrition. One benefit of devices sharing data is that when your food tracker "learns" how many calories you've burned from exercise, it may be able to adjust your calorie limit for the day. Many food-tracking apps are free, while some have one-time or monthly fees. Each app typically also has a web site. Popular food trackers include: Lose It! is dedicated to weight management. It suggests eating plans based on how many pounds you want to lose for a week and projects a date when you'll reach your goal weight. Other features include a breakdown to show how well your day's food choices meet the My Plate USDA guidelines. Lose It! also has a barcode scanner to show you the nutrients and portion sizes of packaged foods. Cost: Basic app and site are free. An annual fee of $39.99 per year is required to sync it with most devices. For that, you get extra tracking and tools, and the ability to set up goals related to exercise, blood pressure, blood sugar, nutrition, sleep, and measurements. Syncs with: Fitbit ( Flex, Force, One, Ultra, and Zip), Jawbone ( Up and Up Pro), Apple Watch, and Misfit Also syncs with these scales: Fitbit Aria and Nokia Scale. My Fitness Pal is for exercise and food logging. It's popular because of its huge database of foods and its supportive community. Cost: Free Syncs with: Fitbit ( Flex, Force, One, Ultra, and Zip), Fitbug Air Tracker, Jawbone ( Up), Garmin Connect, and Withings Pulse Also syncs with these scales: Fitbit Aria, i Health Wireless Scales, Withings My Net Diary allows you to plan and track carbs and fat, blood sugar, blood pressure, and medications with custom trackers. Cost: Free Syncs with: Fitbit ( Flex, Force, One, Ultra, and Zip), Jawbone ( Up), and Withings Pulse Also syncs with these scales: Fitbit Aria, Withings Spark People offers a personalized meal plan to help you meet your fitness goal. It has a massive community where people share tips, encouragement, and recipes. It also has a barcode scanner for packaged food. Cost: Basic app and services are free; for a fee, you can get more recipes or a Spark Coach. Syncs with: Body Media Fit and Fitbit ( Flex, Force, One, Ultra, and Zip) Also syncs with this scale: Fitbit Aria While your fitness tracker can record basic steps and miles, other apps help with exercises that are more specific. If you want to learn yoga or start a strength training routine, there are apps for that. Some apps let you plan runs, hikes, or bike rides, and then track your progress using the GPS on your phone. Endomondo is for sports that involve distance: cycling, kayaking, running, skating, or skiing. It features a large community of like-minded people. Friends can follow you live and write you pep talks during your workout. Cost: Many features are free; a premium version includes heart-rate zones, weather reports, and other features at $3.99 per month for new subscribers. Syncs with: Fitbit ( Flex, Force, One, Ultra, and Zip), and Withings Pulse Map My Fitness allows you to map your route and includes a food log. It has individual programs, too: Map My Run, Map My Hike, Map My Ride, and Map My Walk. Cost: $5.99 per month Syncs with: Jawbone Up. ( The information you have on your Fitbit will transfer to the Map My Fitness app when you sync them. But the information exchange only goes in one direction; the data you have on Map My Fitness does not sync to your Fitbit.) Run Keeper tracks runs using your phone's GPS. It features a stride-rate chart that shows how your stride changes when you walk or run. The app also allows you to set fitness goals and offers free coaching. Cost: Free, plus in-app upgrades at various prices Syncs with: Body Media Fit, Jawbone Up, and Withings Pulse Other apps use incentives to keep you moving. Everymove and Earndit offer prizes and rewards for being active. Cost: Free Both sync with: Fitbit ( Flex, Force, One, Ultra, and Zip), and Body Media Fit Beeminder inspires you to keep your fitness as well as other life goals by charging you if you don't meet them. Cost: Free until you don't meet your goals for the day. Then, you have to pledge $5 that you'll get back on track. If you don't, you pay the $5 every time you go off track. The amount goes up over time. Syncs with: Fitbit ( Flex, Force, One, Ultra, and Zip), Jawbone Up, Apple Health, and Withings Pulse People who don't get enough sleep are more likely to gain weight, studies show. Many fitness devices track sleep and can improve your sleep habits. If yours doesn't, you can use an app to sync with your device. Popular apps include: Sleep Debt helps you get to bed on time so you can catch up on missed sleep. Syncs with: Fitbit (all devices except Zip) Sleepio offers a weekly course package or a 6-week course that teaches you ways to improve your sleep. Cost: $80 for 12 weeks of access Syncs with: Body Media Fit, Jawbone Up (1.0 and SE) Sleep Bot and Sleep Cycle are not apps and don't sync with your device. Instead, they track your sleep cycles via your cell phone. They also work as alarm clocks, waking you up during a light sleep cycle so you'll feel less groggy. Sleep Bot and Sleep as Android also record your snoring. Cost: Sleep Cycle $0.99; other two are free.