Tools

The workbench.

Instruments built for this site's own production, shared because they are more useful in the open. Each one does a single job precisely, runs in your browser, and follows the same design language as everything else here. New instruments arrive as the writing needs them.

Diagnostic instruments By request

Enterprise valuation

CAC & Cash Calendar Diagnostic

Multi-cohort sensitivity analysis, 24-month cash recovery calendars, counterfactual displacement breakdown, and a downloadable executive PDF report.

Open Enterprise Diagnostic

Free instruments

Unit economics

CAC boundary calculator

Calculate assigned CAC, incremental CAC, payback and matched LTV ratios while keeping the customer event, cohort and cost boundary visible. Includes instant PNG/SVG exhibit export.

Open the calculator

Imagery

Duotone studio

Maps a photograph into a two-colour ramp: forest, ink, brass, paper, and exports lossless PNG or size-reported WebP. Runs entirely in the browser; nothing uploads.

Open the studio

Everything on this bench is free to use and carries no account, no upload and no tracking of what you feed it. If an instrument here saves you an afternoon, the journal is where its thinking comes from.