Journal

Notes we still stand by

Short pieces from teaching, not product marketing. Each article is complete on its own page.

12 March 2026

Reading churn in weekly cohorts

Monthly logo charts flatten a bad acquisition week. Here is the grain we insist on in the studio.

2 February 2026

Expansion revenue without vanity MRR

Seat add-ons can hide a quiet price cut. Tag the motion or the chart is theatre.

18 January 2026

When ARPU hides a price experiment

A tagging method so averages remain interpretable after a regional test.

9 December 2025

GB VAT and subscription metrics

Gross versus net of VAT in MRR, and why mixed-rate catalogues confuse NRR.