How much is actually left?
Half-empty spool, label long gone, and eyeballing it is off by a hundred grams. You find out ten minutes before the print finishes. At 3 a.m.
● BETA — FREE
Know how much filament is left. And what that print actually cost.
Track spools, refills and printers from your phone. The calculator includes electricity, printer wear and failed prints — not just grams times price. Fully offline, no account, your data stays on the device.
Get it on Google Play
Free for up to 5 spools · Android 8.0+ · No ads
- OFFLINE
- NO ACCOUNT
- EN & CS
- ANDROID 8.0+
Sound familiar?
What did that print cost?
Grams times price per kilo is where it starts. Electricity, printer wear, failed prints and the hour you spent sanding are missing. You end up selling below cost.
Which spool is which?
Five black PETGs from three brands look identical. Without a label you cannot tell which one was cheap, which was not, or how much is left on any of them.
01 Inventory
Stock that actually matches reality
Every spool has a record: grams left, where it sits, whether it is loaded on a printer, when it was last dried. Subtract manually, or just weigh the spool — the app works out the rest from gross weight minus tare.
- List or grid view, grouped by brand, material or colour
- Percentage remaining and a colour dot matching the real shade
- Filters: running low, opened, loaded, needs reweighing
- Bulk actions via long press
02 Calculator
A price that holds up
Pick a spool from stock, enter grams and print time. The app adds electricity based on printer draw, depreciation, post-processing at your hourly rate, a failure rate and your markup. You see the full breakdown, not just a number.
- Multiple materials in one print
- Depreciation per print or per hour, energy tracked per material type
- Discount, quantity, price per unit
- Finishing a print subtracts material from the real spools and logs the job
03 Refills
Spool-less refills, done properly
You buy refills because they are cheaper. The app tracks empty spools and loose refills separately and pairs them by scanning — scan one half, then the other, done. Every time a spool empties you weigh it and the tare gets more accurate.
- Pair from either side — from the spool or from the refill
- Guardrail: you cannot unload filament from a non-reusable spool
- Calculated savings compared with buying spooled filament
04 Scanning and labels
Identify a spool in a second
Print QR labels straight from the app on a normal printer, or export them as images. No label printer? Write `A1` on the spool with a marker and the camera reads it. Scanning the EAN off the box stocks the spool with every parameter filled in.
- QR codes, EAN-13 and EAN-8, plus OCR for handwritten IDs
- Manual IDs from A1 to Z299 with duplicate checking across the whole database
- Home screen widget for quick scanning
- Empty spools always get the tare printed on the label
05 Statistics
Numbers you can decide from
Kilos per month, average price per kilo, what the shelf is worth, what is left after costs. Monthly consumption chart and your top 5 filaments.
- All time / month / year / custom range
- Cost breakdown: material, electricity, wear, labour, other
- Material share of consumption and refill savings
What makes it different
There are more than ten spool trackers on Play. This is what is done differently here.
Refills as a real workflow
Empty spools, loose refills, two-way pairing by scan, tare that gets more accurate over time. Not a checkbox labelled "this is a refill".
Handwritten IDs for people without a label printer
Write `A1` on the spool with a marker and the camera reads it. The OCR is not infallible — it reads handwriting, so it does get things wrong; that is why it needs five matching reads and corrects the usual character mix-ups. It does not replace a printed QR label, but it saves the day when you have no way to print one. And even if you do print labels, the same scheme works for shelves and rows.
A calculator an accountant would sign off
Multi-material, failure rate, depreciation, labour kept separate. And when you sell for a different price than the calculator suggested, the app remembers both.
Pre-filled filament library
Hundreds of materials from dozens of brands, and with them the weights of empty spools and average prices. The calculator works with real numbers from the first evening, rather than after you have typed your whole shelf in.
Noozy vs. a typical spool tracker
| Feature | Noozy | Typical app |
|---|---|---|
| Works with no internet and no account | yes | partly |
| Loose refills as separate stock | yes | no |
| Pairing a refill and a spool by scanning | yes | no |
| Handwritten IDs read by the camera | yes | no |
| Multiple materials in one calculation | yes | no |
| Electricity, depreciation and failure rate in the price | yes | no |
| Pre-filled filament library | yes | partly |
| Data export without a cloud | yes | partly |
Based on publicly available descriptions of apps on Google Play as of August 2026. Features change — check the current state yourself.
Your data is yours
Noozy has no accounts, no cloud and needs no connection. Stock, prices, projects and photos stay on the phone. I do not sell data, there are no ad networks and nobody is tracked across apps. Back up to a file and keep it wherever you like — or do not back up at all.
Frequently asked
Is it free?
Free in full during the beta. After release it stays free up to 5 spools; larger shelves need a one-off PRO purchase. No subscription.
Does it work offline?
Yes, everything runs offline. A connection is only needed to buy PRO.
Where is my data stored?
On your phone only. You can export a JSON backup any time and put it wherever you like — but that is your call, nothing happens automatically.
What about a new phone?
Export a backup from the old one, move the file, import it on the new one. The app previews the file's contents first and asks you about conflicts.
Do I need a label printer?
No. Print QR labels on any printer, or use manual IDs — write A1 on the spool and the camera reads it.
Multiple printers?
Yes, there is a farm mode with per-printer naming, colour and ordering, and energy consumption tracked separately for PLA, PETG, ASA, PA, TPU and ABS.
Is there an iPhone version?
Not yet. Noozy is Android 8.0 and newer.
Which currencies?
CZK, USD, EUR or a custom symbol, switchable at any time — the app asks for a rate and converts stock, library and printers. Completed print history is deliberately left alone; it is a record of what happened.
How do I report a bug?
Email noozy.support@gmail.com. If the app crashes it offers to send a technical report on the next launch — that helps most.
Try it on one spool
Free up to 5 spools, no sign-up, no ads. If it does not click, uninstall it and nothing is left behind.
Get it on Google Play
Android 8.0 and newer