About the library

The Metrics Library explains the operating metrics that businesses in each vertical run on, for the people who build software for them: product managers, heads of product, CTOs, and executives at vertical software companies.

Each metric page covers what the metric is, why operators track it, how it is calculated with a worked example, how to read it, definitional choices and pitfalls, how different roles use it, and how to present it. Build detail for data teams sits in a collapsed section at the end.

The library is maintained by Semaphor. Contact: analytics@semaphor.cloud.

Sourcing policy

• Definitions follow common industry usage. Where usage differs, the page shows the variants.
• Benchmarks appear only with a named public source, year, and link. We do not publish "industry average is X" without a citation.
• Examples and the interactive example use made-up numbers and are labeled as such. They are not benchmarks.
• Accounting and regulatory notes explain the calculation, not policy. Confirm treatment with a CPA or counsel.
• Every page shows a version and a last reviewed date.

Machine-readable versions

• /metrics.json: every metric with definition, formula, required tables, related metrics, and version.
• /llms.txt: a plain-text map of the library.

Corrections

If a definition is wrong or incomplete, email analytics@semaphor.cloud.