We tune your colors.
We don't watch you do it.
Colorblind-Tune corrects and simulates color vision deficiency directly inside your browser. This page explains — in full, plain-language detail — exactly what the extension collects, stores, and shares. Short answer: almost nothing.
Overview
Colorblind-Tune adjusts colors in real time so that people with red‑green, blue‑yellow, or full color vision deficiency can tell apart the things that matter — charts, traffic lights, status badges, spreadsheets. Its single purpose, as declared to the Chrome Web Store, is: "Enhance colors for colorblindness."
Everything the extension does happens locally, inside your own browser. There is no backend server, no account system, and no analytics pipeline behind it. This policy documents that fact in detail rather than asking you to take our word for it.
How the extension works
When you open a webpage, a small content script injects an invisible SVG color‑matrix filter into that page's DOM.
The filter re‑maps colors mathematically — for example, boosting the red/green contrast that's hard to distinguish with deuteranomaly.
Your chosen mode (Correct or Simulate), color‑deficiency type, and intensity slider decide which matrix is applied.
None of this requires reading, copying, or transmitting the page's actual content — the filter only changes how pixels are rendered on your screen.
Data we collect
Per the Chrome Web Store's own disclosure categories, here is exactly what Colorblind-Tune collects from you, now or in the future:
The only information Colorblind-Tune ever touches is the small settings object described under Storage & security — and that never leaves your own Chrome account.
Permissions we request
Chrome requires every extension to justify each permission it asks for. Here are ours, verbatim from what's submitted to the Chrome Web Store review team:
Used to remember your chosen color mode (Correct or Simulate), filter type (protanopia, deuteranopia, or tritanopia), and intensity slider — synced privately through your own Chrome account via chrome.storage.sync. This ensures your preferences persist across browser sessions and devices. No personal data or browsing information is collected or transmitted to us.
Color vision deficiency doesn't pause at certain websites, so the correction filter needs to be available everywhere you browse. This permission lets the content script apply color adjustments on any page, in real time. It is not used to read, monitor, log, or transmit anything about the pages you visit — the script only injects a visual filter and reacts to the settings you've chosen.
The built-in vision quiz
The popup includes an optional Ishihara‑style plate quiz to help estimate your color vision profile. It runs entirely inside the popup — your answers are held only in memory while you take it and are discarded the moment you close the popup.
If you choose to tap "Apply result," the quiz's suggested mode, filter type, and intensity are saved the same way any manual setting change would be — locally, via chrome.storage.sync. Your individual plate‑by‑plate answers are never saved or sent anywhere, by us or anyone else.
Storage & security
There is no server behind Colorblind-Tune. We don't operate one, so there's no database of user settings for us to lose, sell, leak, or be subpoenaed for.
The only data that exists is three small values — your color mode, filter type, and intensity — stored through Chrome's own storage.sync API. That data is encrypted in transit and at rest by Google as part of your Chrome sync, the same mechanism used for your bookmarks or saved passwords, and is never routed through infrastructure we control.
No remote code is loaded by this extension — every script that runs is bundled directly in the package you installed and reviewed by the Chrome Web Store.
Third parties
Colorblind-Tune does not integrate with analytics platforms, advertising networks, or any third‑party service. It makes no network requests of its own. We do not sell, rent, or transfer any user data to third parties, and we don't use data for any purpose outside the extension's single stated purpose — because no data is collected in the first place.
Children's privacy
Colorblind-Tune is not directed at children under 13 and does not knowingly collect information from anyone, regardless of age — largely because it doesn't collect information from anyone at all.
Changes to this policy
If Colorblind-Tune's data practices ever change, this page will be updated first, and the "Last updated" date at the top will change to reflect it. Continued use of the extension after an update means you accept the revised policy.
Contact
Questions about this policy or how Colorblind-Tune works? Reach the developer directly:
aaronaajit@gmail.com