
Simple Step Tracker
Step tracking that finally considers elevation
What it does
Most step counters ignore vertical movement. I built Simple Step Tracker to explore a better approach by combining GPS and barometer data to estimate elevation during workouts. It’s not perfect (smartphone sensors are tricky), but it gives a more realistic picture of activity — especially for stairs, hills, and outdoor workouts. Built with a focus on accuracy, simplicity, and efficiency.
Does the same job
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Hey HN, Henry here from Cactus. We open-sourced Needle, a 26M parameter function-calling (tool use) model. It runs at 6000 tok/s prefill and 1200 tok/s decode on consumer devices. We were always frustrated by the little effort made towards building agentic models that run on budget phones, so we conducted investigations that led to an observation: agentic experiences are built upon tool calling, and massive models are overkill for it. Tool calling is fundamentally retrieval-and-assembly (match query to tool name, extract argument values, emit JSON), not reasoning. Cross-attention…
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