Follow the portfolio over time
Compare revenue, scheduled costs, and estimated contribution profit over 6 or 12 months.
Junhua · Independent developer
I build MarginDeck and write about running small software products.
I'm Junhua, the independent developer behind MarginDeck. SwingCodeLab is my public workbench for practical notes, small tools, and lessons from building and operating software.
01 / PracticeBuild useful things. Explain the thinking behind them.Junhua
Builder & writer
Builder & writer
Featured project · Version 1.5
MarginDeck
Compare each product's revenue, costs, and estimated contribution profit.
MarginDeck puts a quick financial check in your Mac menu bar. See estimated contribution profit, check upcoming costs, and get an optional weekly reminder to review your records. Version 1.5.1 is available with text, language-switching, and display fixes.
- Platform
- Native macOS
- Data
- Local-first
- Starting point
- One product free
Keep assumptions visible
Make direct and shared operating costs part of the product decision.
Check without opening a dashboard
See the next 7 or 14 days of scheduled costs, including annual renewals, in the menu bar.
Writing from my workbench
View all notes →Field notes
MarginDeck Updates
MarginDeck 1.5: A Quick Financial Check from Your Mac Menu Bar
MarginDeck 1.5 adds a menu bar brief for estimated contribution profit, upcoming costs, and saved revenue updates, plus an optional weekly reminder.
↗Product Operations
SnapQuizX: Rising Installs, Falling Weekly Active Users, and Five First-Session Failures
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.
↗Indie Operations
I Reviewed Seven Products in One Afternoon and Killed Four
A practical portfolio review method for part-time indie developers: capacity math, one attack project, written kill criteria, and a 90-day decision gate.
↗Free resource · Browser-based
Shared cost allocator
Run a one-off scenario for splitting one monthly shared-cost pool across products. No account, upload, or saved data.
For ongoing product tracking and upcoming costs, continue in MarginDeck.