Privacy Policy

Last updated: March 2026

What Kirn does with your data

Kirn connects to your Stripe account via a restricted API key you provide. We use that key to read your subscription and billing history, compute churn risk scores, and send you a weekly digest of your highest-risk accounts. We do not write to your Stripe account.

What we collect

• Your email address (via sign-in with Google or email)
• The restricted Stripe API key you provide
• Stripe data fetched using that key: subscriptions, invoices, and payment events
• Churn scores and signals we compute from that data

How we store it

Your Stripe API key is encrypted at rest. Your Stripe data is stored in our database and used solely to power your Kirn dashboard and weekly digest. We do not sell it, share it with third parties, or use it for any purpose other than providing the Kirn service.

Third-party services

Kirn uses the following services to operate:

• Clerk — authentication
• Stripe — billing for your Kirn subscription
• Resend — delivery of your weekly digest email
• Railway / Vercel — hosting and infrastructure

Model training and prediction improvement

Kirn uses your Stripe data to build per-account statistical models that generate churn risk scores for your subscribers. Your raw subscriber data is never shared with other customers.

We may also use anonymized, aggregated patterns derived from data across accounts to improve prediction accuracy for all users. This cross-account learning uses only statistical signals — not raw data — and cannot be used to identify your business or your subscribers. You may opt out of contributing to this at any time by emailing [email protected]. Opting out does not affect your predictions.

Your data, your control

You can disconnect your Stripe account at any time from Settings. To delete your account and all associated data, email [email protected] and we'll remove everything within 7 days.

Contact

Questions? [email protected]