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What is the most neatest Open Source smartwatch?
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Lilygo T-Watch. Sorry, I know I'm late to the party but no one mentioned these. They're a little closer to a development platform, but basic enough for anyone to pick up and learn. They're similar to the PineTime in terms of being low-power, more simple options. But this uses a more powerful ESP32-S3 SoC and is a lot more responsive.