Privacy Policy

Last updated: July 30, 2026

This policy explains what information Fuselyn ("we", "us") collects when you use the app, how we use it, and who we share it with. Fuselyn is a study-planning tool built for students, and we've tried to write this in plain language rather than dense legal boilerplate.

Information we collect

  • Account information: your email address and authentication credentials, handled by our authentication provider (Supabase).
  • Study content: the syllabi, notes, to-dos, flashcards, plans, commitments, and exam scores you create or upload — this is the core data the app runs on.
  • Payment information: if you subscribe to a paid plan, your payment is processed directly by Stripe. We never see or store your full card number.
  • Usage and diagnostic data: product analytics (pages visited, features used) and error/crash diagnostics, collected to help us understand what's working and fix what isn't.

How we use it

We use your information to:

  • Provide the core service — generate study plans, flashcards, and schedules from your content
  • Send you reminder emails and account-related notifications
  • Process subscription payments and manage billing
  • Diagnose bugs and understand how the product is used, so we can improve it

AI processing

When you use an AI feature — generating a study plan from a syllabus, creating flashcards, searching for resources, or talking to the study assistant — the relevant text you provide is sent to Anthropic's API to generate a response. This content is processed under Anthropic's standard API terms and is not used by us for any purpose beyond producing your result.

Who we share data with

We use a small number of third-party service providers to run Fuselyn. Each only receives the data it needs to do its job:

  • Supabase — database, authentication, and file storage
  • Stripe — subscription billing and payment processing
  • Anthropic — AI generation for study plans, flashcards, resource search, and the assistant
  • Resend — delivery of reminder and account emails
  • Sentry — error monitoring, so we can catch and fix bugs
  • PostHog — product analytics, so we can see which features are actually useful

We do not sell your personal information.

Cookies

We use cookies to keep you signed in (authentication session) and to distinguish visitors for product analytics. We don't use cookies for third-party advertising.

Data retention and deletion

We keep your data for as long as your account is active. If you'd like your account and associated data deleted, contact us at support@studyledger.app and we'll process the request. Some information may be retained where required for billing records or legal compliance.

Children's privacy

Fuselyn is intended for students aged 13 and older. We do not knowingly collect personal information from children under 13. If you believe a child under 13 has provided us with personal information, contact us and we'll delete it.

Security

Data is encrypted in transit, and your study data is isolated at the database level so that only you can access your own records.

Changes to this policy

If we make material changes to this policy, we'll update the date at the top of this page and, for significant changes, notify you by email.

Contact

Questions about this policy? Reach us at support@studyledger.app.