Privacy Policy

Last updated: April 12, 2025

Substack Analyzer is built by a solo developer who hates privacy policies as much as you do. Here's the short version: I collect only what's needed to make the tool work, I don't sell your data, and I keep things as simple as possible.

What We Store

On our servers:

• Email address — For account login (magic link auth) and transactional emails only
• Voice profile — Your writing style description, so comment drafts sound like you
• Scoring rubric — Your topic preferences and scoring criteria
• Usage logs — Which posts you analyzed and when (for your history and debugging)
• Payment info — Handled entirely by Stripe; we never see your card details

In your browser (local storage):

• Analysis history — Full details of posts you've analyzed, stored locally on your device
• Session token — Keeps you logged in

What We Don't Do

• We don't sell your data to anyone
• We don't share your data with third parties for marketing
• We don't track you across the web
• We don't store the full text of posts you analyze (only metadata for your history)

Third-Party Services

We use a few services to make things work:

• Anthropic (Claude API) — Powers the AI analysis. Post content is sent to their API for processing but not stored by us afterward.
• Stripe — Handles payments securely. We never see your card number.
• SendGrid — Sends magic link login emails.
• Render — Hosts our backend.

Data Retention

Your account data stays until you ask us to delete it. Local browser history stays until you clear it or uninstall the extension.

Your Rights

Want your data deleted? Just email me and I'll take care of it. No forms, no runaround.

Contact

Questions? Concerns? Just want to chat? Email me at simon@substackanalyzer.app.