Privacy Policy
Last updated: October 23, 2026. Plain language, no surprises: here is what Filament Calculator stores, what it does not collect, and the choices you have.
The short version
Filament Calculator runs 100% in your browser. There are no accounts and no servers storing your spools. All calculations happen locally on your device. If you click Save, your inventory is stored in your browser's localStorage on that device only. Clearing your browser data deletes it permanently — use Export backup if you want a file you can keep or move to another device.
What we do not collect
We do not collect your spool weights, filament prices, brands, colors, or inventory contents. That information stays on your device and is never transmitted to us.
Calculator and inventory data
Calculator inputs and results are processed entirely in your browser. When you use Export backup, your browser creates a JSON file on your device. Import backup reads a file you choose and restores the inventory into local storage. None of this passes through our systems.
Advertising
This site uses Google AdSense to keep the tool free. Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visit to this site and/or other sites on the Internet.
You may opt out of personalized advertising by visiting Google Ads Settings. You can learn more about how Google uses data from sites that use its services at policies.google.com/technologies/partner-sites. Alternatively, you can opt out of a third-party vendor's use of cookies for personalized advertising by visiting aboutads.info/choices.
Your browser also lets you block or delete cookies at any time through its settings. The calculator and inventory will still work, though saved spools rely on local storage staying intact on your device.
Analytics
We use anonymous Hostinger analytics for basic visitor counts. This collects no personal data.
External links
This site links to other websites, including Amazon search pages. The site participates in the Amazon Associates program: as an Amazon Associate, we earn from qualifying purchases, and prices, shipping and availability are set by Amazon and may change. Once you leave filamentchecker.com, the other site's own privacy policy applies to your visit there.
Changes to this policy
If we change how the site handles information — for example, if we introduce user accounts or cloud storage in the future — we will update this page and change the "last updated" date above before the change takes effect.
Contact
For privacy questions, contact the site owner at hello@filamentchecker.com — Cobble Hill, BC, Canada.