Last updated: August 17, 2026
Hellbox (formerly Font Proof) is a Mac app made by Minim Industries. This policy covers what data we collect when you visit this website and use the app.
The app never transmits your fonts, your proofs, or anything about your work. Everything stays on your Mac. The only things it sends are a license check and an update check, and we log those (without your license key itself) so we can see how many people use Hellbox each day and which versions are in use. Details below.
This website uses Google Analytics to understand which pages people visit. That's it.
If you accept cookies, we use Google Analytics to collect anonymous information about how visitors use this site. This includes pages viewed, referrers, approximate location (country level), browser type, and device type. We use this to understand which features people care about.
You can decline cookies via the banner. If you decline, no analytics data is collected from your visit.
Google's privacy practices are described at policies.google.com/privacy.
If you buy Hellbox, the transaction is handled by Lemon Squeezy, our payment processor and Merchant of Record. They collect billing information needed to process the sale (name, email, payment details, billing address for tax purposes). Their privacy policy is at lemonsqueezy.com/privacy.
We receive your name and email so we can send you your license key and respond to support requests. We do not share this with anyone else.
Hellbox runs locally on your Mac. It does not transmit your fonts or proof files anywhere, and does not require an account. Its network activity is limited to two things:
License checks. On launch, the app confirms your license is still valid with our licensing provider (Lemon Squeezy). This sends your license key and a per-device identifier, never your fonts or work. That request passes through a server we run, which records that a license was checked on a given day, along with the device identifier and the app version. We store a one-way hash of the license key, not the key itself. We use this to know how many people are actively using Hellbox and to help you if a license or activation misbehaves. It is not shared with anyone.
Update checks. Once a day, the app asks our server whether a newer version exists. That request carries the app version and nothing about you or your machine; we count these to see which versions are in use.
Feature usage. Once a day, alongside the license check, the app sends the names of the features that copy used since its last report: for example "Glyph Set" or "Layer mode". These are fixed labels from a short list inside the app. They never include your fonts, your proofs, file names, text, or settings values. They are stored with the same hashed license key as the license check, so we can see which features are used and by how many people, and get in touch when a feature someone relies on is about to change. You can turn this off in Settings, under License, and see exactly what the app would send.
Nothing else leaves the app. There is no crash reporting and no third-party analytics inside Hellbox.
Questions about this policy? Email jake@minim.industries.