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Bug report, tool suggestion, or general question — we read every message and reply within two business days.
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Bug reports: Include which tool, what you entered, what you expected vs. what happened, and your browser name and version.
Formula or citation errors: Tell us which entry is wrong and what the correct value should be, with a source if you have one.
Tool suggestions: Describe what you're looking up and how often — if it fits the QuickRef model (instant, browser-based, no login), we'll consider it.