Gridlytics Privacy Policy

Last updated: September 4, 2026

Gridlytics is a Chrome extension that adds fantasy football analytics (standings, power rankings, playoff odds, start/sit advice, waiver suggestions, and trade analysis) on top of your existing Sleeper or ESPN fantasy football league. This page explains what data the extension handles and why.

What data Gridlytics accesses

• Sleeper leagues: your league's public roster, matchup, and settings data, fetched from Sleeper's own public API using the league ID you connect. Sleeper does not require a login for this data.
• ESPN leagues: your league's roster, matchup, and settings data, fetched from ESPN's API using your browser's existing logged-in ESPN session. Gridlytics never sees or stores your ESPN username or password — it simply reuses the session your browser already has open.

Gridlytics does not request or store your Sleeper or ESPN account credentials at any point.

How that data is used

League and roster data is sent to Gridlytics' backend server, where it's stored and used solely to compute the analytics shown in the extension (standings, projections, rankings, trade and waiver analysis, and similar features). It is not used for any other purpose.

Access tokens

When you connect a league, the extension generates a random access token in your browser. Only a one-way cryptographic hash of that token is ever sent to or stored on the Gridlytics backend — the raw token itself stays in your browser's local storage (chrome.storage.local) and is sent with each request to identify you. This means the backend never has access to a usable copy of your token.

What Gridlytics does not do

• No analytics, tracking pixels, or advertising SDKs of any kind are included in the extension or backend.
• Your data is never sold, rented, or shared with third parties.
• No data is used for advertising or for purposes unrelated to the analytics features described above.

Data retention and deletion

League data is retained so the extension keeps working across sessions. If you'd like your data deleted, email 25sean42@gmail.com with the league(s) you'd like removed, and it will be deleted from the backend.

Contact

Questions about this policy or your data can be sent to 25sean42@gmail.com.

Changes to this policy

If this policy changes, the "Last updated" date above will be revised accordingly.