# Privacy Policy

The short version: we do not have accounts, we do not track you, and we keep
as little of your game data on our server as we can. There is very little to
disclose, by design.

## What we store

When you submit a PGN for analysis, the game and its move-by-move Stockfish
evaluation pass through our server only transiently, for the duration of the
analysis itself. Once your browser receives the finished analysis, it saves
the full result in your own browser (via IndexedDB) and we delete our copy
immediately, so the game is stored only in your browser after that point. As
a safety net in case that handoff fails, any leftover analysis record is
automatically deleted after 30 minutes regardless.

Games you play against the computer are different: because the engine is an
opponent running on our server, the in-progress game (moves, position,
result) is kept there so both you and the engine can keep playing it, and so
you can return to it later using its own private, unguessable link.

Your username is not stored on our server at all. It is kept only in your
own browser (local storage) and is used solely to pre-fill the form and
highlight which side is yours in the replay.

We do not require or collect accounts, email addresses, or any other
identifying information to use the app.

## Server logs

Like all web servers, ours records standard access logs that include your IP
address, the pages you requested, and timestamps. These logs are used solely
for security and operational purposes (detecting abuse, diagnosing errors).
Logs are kept only as long as they are useful and then deleted.

## No accounts

There are no logins, usernames, passwords, or user profiles. We do not ask
who you are and we have no way to connect your games to any identity.

## No tracking, analytics, or ads

Chess App does not use tracking pixels, advertising networks, or
third-party analytics services. Only the essential cookies needed for the
app to function (CSRF protection and the Rails session cookie) are used. No
data is sent to Google, Meta, or any other third-party service.

## You are in control of your data

You can delete any analyzed game at any time from the library page, which
permanently removes it from your browser (there is no server copy to
delete). Computer games can be resigned or abandoned; deleting one also
removes it from our server. You can back up or move your analyzed game
library using the Export and Import feature on the main page.

## No selling or sharing of data

We do not sell, rent, or share user data with third parties. There is
essentially no user data to share: we do not collect it in the first place.

## Who runs this

Chess App is built, owned, and operated by [Nuthatch, LLC](http://nuthatchllc.com).
For questions about privacy, contact us at sales@nuthatchllc.com.

## Changes to this policy

This policy may be updated from time to time. When it changes, we will
update the effective date below. Continued use of the app after a change
constitutes acceptance of the updated policy.

_Effective date: July 1, 2026_