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Siphon is an unofficial, community-built Windows tray utility developed by kayodante for developers who work with Claude Code and want continuous visibility into their usage limits. Running quietly in the Windows system tray, the application tracks Claude Code consumption in real time by reading from the local Claude Code data files and the OAuth usage endpoint that Claude Code itself uses for authentication. It surfaces the current 5-hour session quota, the rolling weekly limit, and daily and monthly cost totals, giving users a consolidated view of how much of their allowance remains. One of its distinguishing features is its notification handling: when a session quota reaches 100%, Siphon schedules a native Windows toast notification for the exact reset time so the next usage window is not missed, and if the application happens to be closed when that reset occurs, the missed notification fires on the next launch. For ongoing awareness during active work, an optional always-on-top floating widget keeps the key figures visible, while color-coded tray icons reflect the current quota level at a glance without requiring any interaction. The interface is available in both English and Brazilian Portuguese, broadening its accessibility to a wider developer audience. Within a software catalog, Siphon fits into the developer tools and system utilities category, specifically as a usage monitoring companion for AI-assisted coding workflows. It is distributed as open source software under the MIT license, allowing inspection and modification of its codebase, and its documentation explicitly notes that it is not affiliated with, endorsed by, or sponsored by Anthropic. The project has seen active development, with 28 versions released to date; the current version is 1.13.3, representing the latest iteration of the utility's feature set and stability improvements.
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