KoBar
Your modular, always-on-top desktop utility sidebar.
What it does
KoBar is a frameless, transparent, always-on-top desktop sidebar built with Electron and React. It docks to either edge of your screen and provides instant access to a rich set of productivity tools, all without leaving your current workflow. Think of it as a Swiss Army knife that floats on your desktop: clipboard manager, notes, AI assistant, screenshot studio, media controller, and more, all in one sleek, customizable sidebar.
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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…
Life & fun · May 2026 · github.com
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Dev tools · May 2026 · github.com