Sereal tracks every card and comic you own against live sold comps —
so you can see what’s gained value, which raws are worth grading, and
what to sell before the comp goes stale.
Invites go out in batches · AGPL-3.0, self-hostable
app.serealbox.com
Collection — every card and comic, with live comps, cost basis, and P/L. Straight from the app.
Why it exists
A spreadsheet stores numbers. It won’t tell you when they’re wrong.
Most of us started in a Google Sheet. It works fine until the parts that
actually cost money: pulling a current comp, deciding whether to grade,
remembering what you paid. Those are the parts Sereal does for you.
01
The number you typed in is already old.
Sereal re-pulls recent sold listings and marks a price stale when the last real sale is weeks back — so you’re not still pricing off a comp from two seasons ago.
02
Grading is a $25 bet with a six-week wait.
Before you submit, Sereal lines up the raw comp against the graded comp at each grade and shows the expected value. Sometimes the answer it gives is don’t.
03
A case break leaves you with no real cost basis.
Buy three spots in a $400 break and Sereal splits the cost across the cards you actually pulled, so each one carries a real number instead of $0.
04
By the time you sell, you’ve forgotten what you paid.
Sereal keeps the basis and books proceeds against it — eBay and shipping fees included — so the P&L line is what you actually made.
The actual app
Past the collection list, it’s a set of workflows.
One sample collection across every surface — graded showpieces next to raw break
pulls. Nothing staged for the screenshot.
Dashboard
Total in, current value, and net P/L at a glance.
Breaks
Spot cost split across the cards you actually pulled — real basis, never $0.
Grading
Cards and comics in one pipeline, with the break-even a slab has to clear.
Sell Desk
What to sell next, ranked — comp beside cost, one-tap Lower / Watch / To-lot.
Open source · a secondary path
Prefer to run it yourself? You can.
Sereal is a Next.js app on Supabase, licensed AGPL-3.0. Self-hosting is a
supported way to run it — your own Supabase, your own eBay key, one collection
per install. It assumes you’re comfortable with Docker; there’s no installer
wizard yet, and the public build is still being packaged.
