sumwerk

Articles

What we learned about subscription metrics while building sumwerk, written for the problem and not for the product.

Why MRR from invoices jumps, and what to use insteadA plan change in the middle of a billing period makes invoice-based MRR spike one month and dip the next. MRR belongs to the subscription's state, not to invoice amounts.September 21, 2026
NRR and GRR explained with one worked exampleNet and gross revenue retention answer different questions. A worked example with five customers, the two formulas, and the three mistakes that make the numbers look better than they are.September 21, 2026
When last quarter's MRR changes: restatementsSubscription metrics change in retrospect more often than anyone admits. Why that happens, why hiding it costs trust, and how closing months and recording restatements fixes it.September 21, 2026
Churn signals: flag paying customers who stopped using youFailed payments and scheduled cancellations are late signals. Product usage is an early one. How to find the usage attribute that predicts churn, turn it into a rule, and act on it.September 21, 2026

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