Privacy Policy
Effective 25 September 2026 · Updated 1 November 2026
LuminGo is an on-device Go review tool. There is no account to create. This policy explains what LuminGo handles and what it does not.
What stays on your device
Game records, problems, text and voice notes, unfinished games against KataGo, and analysis results are stored only in the app's sandbox on your device. LuminGo has no copy of them.
Downloading analysis models
The App Store package ships with a base analysis model; stronger models download only when you tap to get one. Your device then asks the LuminGo server for the model list and fetches the file from our distribution host. To deliver the file and diagnose failures, the server logs the information a web request necessarily carries: IP address, user agent, request time, and the file requested. Model downloads never include your games, notes, photos, or usernames on other platforms.
Subscriptions and purchases
Pro is sold through Apple's in-app purchase system, as a subscription or a one-time purchase. Apple processes the payment and keeps the billing and subscription records under Apple's own privacy policy. LuminGo never sees your card number or billing address; the app only records on your device whether Pro is unlocked. Manage or cancel a subscription in your Apple Account settings.
Sharing you start
Nothing is shared unless you choose to share. When you do, the complete SGF (which may carry comments or text notes from the original file), the current position, player names, and the computed candidate points, win rate, score difference and read count are uploaded to the LuminGo share server and given a public link. Anyone holding the link can read and download that SGF. Voice notes, original photos, and the KataGo search tree are never uploaded. Links expire after 180 days by default, and you can revoke one earlier from the Shared list in the app. The server processes the connection data needed to serve the page; older copies may persist in backups for the length of the backup cycle.
Permissions
The microphone is requested the first time you record a voice note. Recordings stay on your device as notes for the current position and are never uploaded; you can play or delete them in the notes list. Camera access is requested for board photo recognition: the photo is used on-device to read the board and is never uploaded. Importing a photo from your library goes through the system picker, so LuminGo can read only the single image you choose at that moment, not your whole photo library.
What we do not collect
LuminGo has no accounts, no advertising, and no cross-app tracking. It does not collect contacts, location, health data, or browsing history, and it embeds no third-party analytics or advertising code — your usage is not uploaded for analysis.
Retention and deletion
Delete content from the game library or problem sets to remove it from your device; deleting the app removes everything in its sandbox. Copies inside device backups are governed by your Apple backup settings. Share links can be revoked in the app at any time, or they expire after 180 days. You can also write to the address below to ask us to delete something.
Online game records
To list games from another platform, the app sends the username you typed, plus the paging parameters the public interface requires, to that platform's own public endpoints. LuminGo does not ask for, collect, or store those platform passwords. Those endpoints may change, rate-limit, or go away; SGF import, local records, notes, problems, and on-device KataGo analysis keep working regardless. LuminGo is not affiliated with or endorsed by these platforms.
Contact
Questions about privacy or about deleting your content: ruojunm@gmail.com.