Mainplate
Stop managing your watch flips on a spreadsheet
Mainplate launched on April 20, 2026.
What it does
I've been flipping watches for years with the same doubt after every sale: was this actually worth it? Mainplate tracks every flip — purchase price, parts, hours worked — and tells you the real ROI. Not the optimistic one. Personal collection, parts inventory, timegrapher log with diagnostic warnings. No cloud, no subscription. Just Docker and your data.
Flip & watch collection neat dashboard. Take note on your watches, flips and wishlist in one single place. - flaggz/mainplate
A self-hosted web app for watch enthusiasts and watchmakers to track personal collection, flips, parts inventory, and equipment — all in one place. Built with Flask + SQLite, runs entirely in Docker with no external dependencies. Every flip is a complete financial record. Mainplate calculates total cost from the purchase price, every log entry expense, and labor hours billed at your configured hourly rate. Profit and ROI % are computed automatically once the flip is marked as sold — giving you a real picture of whether a job was worth your time. The Dashboard aggregates everything: total capital deployed, realised profit, average ROI across all sold flips, and open inventory value. The…from github.com
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