Sub-processors
Last updated 25 August 2026.
These are the third parties we rely on to run Concentration Chart. The list is short because the application processes your files in your browser: there is no server-side pipeline that any provider could see board data through.
| Provider | Purpose | Location | What it can see |
|---|---|---|---|
| Vercel Inc. | Website and application hosting, CDN | United States | Standard request logs for this site — IP address, requested URL, user agent. Not the contents of any file you load: those are never sent. |
| Stripe, Inc. (billing; test mode until launch) | Subscription billing and payment processing | United States | Billing contact and payment details you enter at checkout. Card details go directly to Stripe; we never hold them. |
| Zoho Corporation | Email (correspondence with us) | United States | The contents of email you send us, and our replies. |
Changes
We will update this page before adding a sub-processor that can access customer personal data. If you have a data processing agreement with us and would like advance notice of changes, tell us and we will add you to the notification list.