Notes from building MyUsage.
Architecture decisions, design iterations, and the occasional yak-shave from the engineering side of a small macOS utility.
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No backend, locally-computed cost: how MyUsage aggregates AI usage across multiple Macs
Two engineering decisions behind a serverless multi-Mac AI usage tracker — BYO sync folder for cross-device aggregation, and locally-computed dollar costs because the providers don't tell you the dollars.