Privacy policy
Last updated: October 11, 2026.
Mathproven is operated by OpenSlot LLC, a Kentucky limited liability company (Organization No. 1623293). This policy says what we collect, what we never see, who else is involved, and what you can ask of us.
The short version
- Your files are read in your browser and are never uploaded.
- An account is an email address, a plan, and a refund count. Nothing else.
- No advertising trackers, no session recording, no selling of personal information.
Your files never leave your browser
When you open a file or type numbers into a tool, the work happens in your browser on your device. The file is not uploaded, and nothing read from it (names, amounts, account numbers, header text) is sent to us or anyone else. There is no upload feature on this site.
The medical billing pages go further: they are served with a security policy that blocks the page from making any network request, they carry no analytics or third-party scripts, and they keep working offline once loaded.
Drafts and settings some tools remember are kept in your browser's own storage on your device. Clearing your browser data removes them.
Spreadsheet add-ins
The Excel add-ins run inside Excel. The Google Sheets add-ons do their reading and math in the sidebar, in your browser: a file you pick is read there, and the results are written into your spreadsheet through Google's script service. Nothing is sent to us.
Either way, the results are stored wherever your workbook is stored: on your device, with Microsoft (Excel on the web, AutoSave, or OneDrive), or with Google. They are stored there, never by us.
The results can hold everything an add-in read. The add-ins that open an 835 file write patient names, claim numbers, payer and payee IDs, and every amount from that file into your workbook, so the company that stores your workbook stores those too.
The Excel add-ins load Microsoft's Office library from Microsoft, as every Excel add-in must, and Microsoft and Google handle your workbook under their own terms. A paid add-in is unlocked by a key you paste in, which the add-in checks on your device without contacting us.
What we store
- Your email address, if you create an account, to sign you in.
- Your plan (free, Pro, or Firm).
- Usage counts, such as whether a refund has been issued on the account.
That is the whole account record. We do not keep passwords (sign-in is by one-time email link), payment card numbers, or any content from your files.
Format requests
If you ask us to support a file format, we receive only the tool you chose and the bank, payer, or software name you typed. Do not type personal information there.
Measurement
We keep aggregate counts: how many times pages in a section were served in a day, and how many accounts were created. Each count carries the section and a channel word, and nothing about the visitor.
The channel word is one of search, marketplace, footer, template, or direct. It is worked out from the link you followed or from the name of the site you came from. The referring address itself is not kept.
When someone subscribes, the section and channel words are also attached to the subscription record that Stripe holds, so we can see which sections subscriptions come from. That record is tied to the subscriber's account, so there the two words are not anonymous.
We do not use advertising trackers, session recording, or fingerprinting. Medical billing pages have no measurement code of any kind and are left out of our own page counts.
To limit abuse of the sign-in form, the number of sign-in links requested for an email address and from a network address is counted for one hour and then discarded.
Cookies and browser storage
One cookie keeps you signed in. It is set only after you sign in and is not used for tracking. There are no advertising or analytics cookies.
Your browser's own storage holds a few things for you on your device: how many free runs you have used today, drafts and column choices some tools remember, and your light or dark setting. An add-in keeps the key you paste into it in its own storage inside Excel or Google Sheets. None of this is sent to us.
Who else is involved
- Stripe processes payments and holds your billing details, receipts, and invoices under its own privacy policy. We never see your card number.
- Cloudflare hosts the site, holds the account record and the aggregate counts, and sees standard request data such as IP addresses as part of delivering pages.
- Resend delivers sign-in links to the address you give.
We do not sell personal information, and we do not share it for advertising.
Where data is processed
We are based in the United States, and the companies above process data in the United States and other countries where they operate. If you use the site from elsewhere, your account email and billing details are processed there.
Keeping and deleting
- Account record: kept while your account exists.
- Sign-in limits: counted for one hour, then discarded.
- Support messages: up to 30 days.
- Payment records: kept by Stripe for as long as the law requires.
- Aggregate counts: hold nothing about a person.
Email support@mathproven.com from the account's address to have your account record deleted.
Your choices and rights
You can ask us what we hold about you, ask us to correct it, or ask us to delete it, by emailing support@mathproven.com from the address on the account. We answer within 30 days. Depending on where you live, the law may give you further rights, such as objecting to a use of your data or complaining to your data protection authority; we honor those requests wherever they apply. We use your email address and plan to provide the service you asked for, and the aggregate counts to run and improve the site.
Security
The site is served over an encrypted connection. Sign-in uses one-time links instead of passwords, so there is no password to steal. The account record is kept to the minimum above, and file contents never reach us, so they cannot be exposed by us.
Children
Mathproven is for businesses and professionals and is not directed to children. We do not knowingly collect information from anyone under 16.
Support
We never ask for your files, and we ask that you never send them. Any file that arrives by email is deleted without being opened, and a message that looks like it contains file contents is deleted unread.
Other messages sent to support@mathproven.com are kept for up to 30 days. An automated system on our own computer reads them to pick an answer from this site's published help text.
Changes
If this policy changes, the new version is posted here with a new date.
Contact
OpenSlot LLC, a Kentucky limited liability company (Organization No. 1623293)
1501 South Greeley Highway, Ste C #1526, Cheyenne, WY 82007, USA
support@mathproven.com