Apple S3

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<div style="font: bold 2em/1.2 -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Helvetica Neue', Helvetica, Arial, sans-serif; color: var(--wiki-color);">Apple S3</div>
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! class="ios-lab" | Designer
| class="ios-val" | [[Apple]]
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! class="ios-lab" | Introduced
| class="ios-val" | September 2017 (Apple Watch Series 3)
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! class="ios-lab" | Type
| class="ios-val" | System in Package (SiP)
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! class="ios-lab" | CPU
| class="ios-val" | Dual-core (~70% faster than [[Apple S2|S2]])
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! class="ios-lab" | Wireless
| class="ios-val" | [[Apple W2|W2]] wireless chip · LTE cellular (optional)
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! class="ios-lab" | Devices
| class="ios-val" | Apple Watch Series 3
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! class="ios-lab" | Predecessor
| class="ios-val" | [[Apple S2]]
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! class="ios-lab" | Successor
| class="ios-val" | [[Apple S4]]
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{{Apple silicon Navbox}}

The Apple S3 untethered the Watch: its optional LTE modem made September 2017's Apple Watch Series 3 the first that could call, text, and stream with the iPhone left at home. A seventy-percent faster dual-core let Siri finally speak from the wrist, the integrated [[Apple W2|W2]] chip sped up Wi-Fi and Bluetooth, and a barometric altimeter counted flights climbed.

= Legacy =

The Series 3 became the Watch's iPhone 3GS moment — the affordable workhorse Apple kept selling until 2022, five years on. That longevity cut both ways: the S3's 8 GB and aging cores strained under late watchOS releases, and its watchOS 8 endpoint became the argument for the S series' later performance headroom.