Early wearable tech
Digital calculator watches in the late 1970s and 80s were early proof that people would wear a small computer on their wrist if it did something useful. Simple mechanical pedometers — clip-on step counters — existed even earlier, long before anything digital, and set the basic idea that later fitness trackers would build on: quietly counting something about your body throughout the day.
Fitness trackers arrive
Fitbit, launched in 2009, is generally credited with turning "digital pedometer" into a real consumer category: a small clip-on (later wrist-worn) device that tracked steps, synced to an app, and turned daily activity into a number you could watch improve. It proved people wanted their activity data, not just their step count.
The smartwatch era
Pebble's 2012 Kickstarter campaign — funded in under two hours — showed there was real demand for a smartwatch before any major tech company had made one work well. Apple Watch (2015) became the category's dominant product, and Google's Wear OS gave Android users their own smartwatch ecosystem. Unlike early calculator watches, these were genuinely connected to a phone — notifications, apps, payments.
Health sensors get serious
What started as step-counting expanded into real health monitoring: continuous heart rate, ECG (heart rhythm) readings, blood oxygen, sleep tracking, and fall detection. Some of this has moved wearables from "fitness accessory" toward something closer to a genuine health device, including features cleared by regulators in some markets.
What's next
AR glasses (see the AI and AR article) are frequently framed as the next wearable frontier — shifting from a screen on your wrist to information overlaid directly on what you're looking at. Whether that becomes as mainstream as the smartwatch is still an open question.