Scar: Trading Journal — Privacy Policy

Effective date: 2026-08-12

Scar: Trading Journal ("Scar", "the app") is published by QuantSignals, Inc. It is a private journal for trading mistakes: you write down what went wrong, the app turns it into a rule, and reviews it with you over time. This policy explains what the app collects, how it collects it, what it is used for, and who it is shared with.

The short version

Scar is local-first. Your journal lives on your device and the app works fully offline, with no account.
If you sign in, your entries can sync to our servers so they survive a lost phone and reach your other devices. Each row is owned by your user id and protected by row-level security, so no other user can read it.
When you ask Scar to tidy an entry into a rule, that entry's text is sent to DeepSeek, a third-party AI provider, to write the rule.
Scar does not use the microphone and does not record audio. Session narration is spoken by your device's own text-to-speech; nothing is uploaded to produce it.
No advertising SDKs, no third-party analytics, no cross-app tracking, and we do not sell your data.

What we collect, how, and what it is used for

Data	How it is collected	What it is used for
Journal entries: the mistake you describe, the rule derived from it, and your review history	You type them into the app	Showing your journal, scheduling reviews, and measuring whether a rule is holding
Trade details you choose to record (instrument, size, outcome, notes)	You type them into an entry	Grouping entries and showing your own patterns back to you
App settings and session progress	Stored on your device as you use the app	Restoring the app where you left it
Email address and provider profile (only if you choose to sign in)	You enter an email for a one-time code, or sign in with Apple, Google or Discord	Syncing your journal across devices, and carrying a subscription bought on the web or another device into this one
Subscription status	From Apple's App Store via RevenueCat when you subscribe or restore	Unlocking Scar Premium and restoring it on your other devices

We do not collect your contacts, photos, camera, microphone, precise location, health data, or your browsing activity in other apps. We do not use third-party analytics or advertising SDKs, we do not track you across apps or websites, and we do not sell your data.

Sharing with a third-party AI provider

Turning a rough note into a written rule is done by an AI model. When you use that feature, our backend sends the text of that entry to DeepSeek (DeepSeek AI, api.deepseek.com) and returns the rewritten rule to your device.

Your name, email address, account identifiers, device identifiers and subscription status are not sent to DeepSeek. Entries you never run through that feature are never sent anywhere for AI processing.

Where your data is stored

Entries are stored on your device. If you are signed in, they are also stored in our database (hosted by Supabase) under your user id, with row-level security so that only your account can read or write them. Subscription state is held by RevenueCat and Apple.

Keeping your data, and deleting it

Entries stay until you delete them. Deleting an entry in the app removes it locally and, if you are signed in, from our database.
Deleting the app removes everything held on the device.
You can delete your account and everything stored against it from Settings → Account → Delete account. That removal is permanent.
You may also write to support@quantsignals.xyz and we will delete your account and its data.

Children

Scar is not directed to children under 13, and we do not knowingly collect data from them.

Changes

If this policy changes materially we will update this page and the effective date above.

Contact

QuantSignals, Inc. — support@quantsignals.xyz