Apple Watch: How it compares with other smartwatches

Apple hopes to build momentum in the wearable technology domain, introducing a new smartwatch to compete with Google's Android Wear software. The company unveiled specifics of its Apple Watch at a press event Monday in San Francisco.

According to research firm Strategy Analytics, 4.6 million smartwatches were shipped worldwide in 2014 and Apple could ship 15.4 million units in 2015. Among the companies competing for market share:

Pebble Time features:

• Pebble operating system

• Full-color e-ink screen (similar to recent generations of the Kindle e-reader)

• Bluetooth

• Up to 7 days of battery life

• Slimmer design (20% thinner than original Pebble)

• Water resistant

• Customizability

• 6,500-plus Pebble apps and watch faces

• "Timeline" software interface connects to calendars, alarms and apps

• Step tracking with Misfit and Jawbone

• Microphone for sending voice replies and recording voice notes

Samsung Galaxy Gear S features:

• Tizen operating system

• 3G, Wi-fi, Bluetooth

• Make/receive calls, check messages while away from phone

• Voice command

• Infrafred sensor allows watch to be used as TV remote

• Personal fitness monitor

• Exercise apps available, including S Health, Nike+Running and MapMyRun

• Swappable bands and faces

• Up to 4 days of battery life; typical usage 1-2 days

• Water/dust resistant

Motorola Moto 360 features:

• Android Wear operating system

• Built in pedometer and heart rate monitor

• Voice control with Google Now

• Text messages, email

• 1-day battery

• Customized case finishes, bands and watch faces

LG G Watch R features:

• Android Wear operating system

• Get messages, meeting notifications and weather updates at-a-glance

• Voice command with "OK Google" to respond to texts, instant messages and e-mails

• Changeable watch bands and faces

• 9-axis sensor setup with accelerometer, compass, gyroscope, barometer and heart rate monitor

• Water/dust resistant