Your slicer already knows what one print costs. Spoolworth is for what comes after: which of the last forty you sold actually made money once the marketplace took its cut, what is left on each spool, and what to quote next time. A ledger that keeps itself — the calculator is just the front door.
Free to use, including the full calculator. iPhone, iOS 17+.
The same argument, told quickly: what a print costs once you stop counting only the plastic.
This is the app's real cost engine, running in your browser. Change anything and watch what it does to the number you should be charging. Nothing is sent anywhere.
What it actually costs
Charge this, each
Printer assumed at $699 over 5,000 hours at 110 W, and $0.16/kWh — all editable in the app, along with your own printer presets.
Every screen below is the real app, not a mockup.

Grams and print time fill themselves from the file you
already sliced. Open a .gcode or Bambu .3mf from Files, AirDrop it
across, or just paste the summary text.
.3mf
Material is the one everybody counts. The other five are where the margin quietly goes.

Save a quote as a job, mark it sold, and the dashboard answers the only question that matters — month by month, and all time.

Quote off a spool's real cost per kilo, and the grams come off automatically when the job prints. Mark a job back and the filament goes back too.

A clean card with the price, the quantity and what's included — and none of your costs, margin or fees. That separation is enforced in code and covered by a test whose whole job is trying to leak a number.
Quote as much as you like without paying anything. Pro is for when you start keeping records.
The complete calculator, slicer import, and quote sharing. Keeps your three most recent saved jobs — delete one and the slot comes back.
Or $4.99 a year if you'd rather. Same features either way.
| Free | Pro | |
|---|---|---|
| Full cost calculator and price suggestion | ✓ | ✓ |
| Slicer import and quote sharing | ✓ | ✓ |
| Saved jobs | 3 | Unlimited |
| Profit dashboard, month by month | — | ✓ |
| Spool inventory with low-filament warnings | — | ✓ |
| Quote straight off a spool's real cost | — | ✓ |
| CSV export of every job | — | ✓ |
No account. No sign-up. No cloud sync, and no server of ours that ever sees a job, a price or a margin. Purchases are handled by Apple. Deleting the app deletes the data — export to CSV first if you want to keep it.
Free to download. iPhone, iOS 17 or later.