Notes from building and operating small software.

MarginDeck 1.5 adds a menu bar brief for estimated contribution profit, upcoming costs, and saved revenue updates, plus an optional weekly reminder.

A fresh-account walkthrough of SnapQuizX exposed five client-side failures after installs rose while weekly active users fell. These counts did not measure cohort retention.

A practical portfolio review method for part-time indie developers: capacity math, one attack project, written kill criteria, and a 90-day decision gate.

A first-hand release note on comparing recorded revenue, scheduled costs, and estimated contribution profit over time without smoothing away billing months or presenting estimates as forecasts.

A first-hand release note on modeling temporary subscription pauses without deleting the cost, rewriting earlier months, or pretending the vendor service changed.

A first-hand setup guide for small product sites, covering properties, canonical hosts, sitemaps, URL inspection, IndexNow, and search and AI performance reports.

A practical method for recording subscription price, cadence, and billing-date changes while preserving the terms that applied to earlier periods.

Build a practical 12-month cost plan for a new app by separating existing resources, new scheduled costs, one-time expenses, and currencies.

A field note on MarginDeck 1.1.1, including dated subscription cost changes, Price & Billing History, and optional local reminders for expected charges.

MarginDeck 1.2 adds saved product cost plans, letting indie developers combine existing and expected new costs without changing recorded business data.

Compare equal, revenue-weighted, usage-based, and custom cost allocation, with a worked example and effective dates.

Learn how to calculate product-level contribution profit, choose useful cost boundaries, and turn the result into better indie app decisions.

A practical way to uncover direct expenses, shared subscriptions, owner time, and hidden obligations across a portfolio of software products.