KnockKnock — Privacy Policy

Last updated: August 31, 2026

KnockKnock ("the app," "we," "us") is a prayer and emotional check-in app in a Christian faith context. This policy explains what information the app handles and how. We built KnockKnock to be private by default — there are no accounts, and your check-ins stay on your device.

This is a plain-language policy. If anything is unclear, contact us (below).

The short version

• No account, no sign-up. Using the app doesn't require your name, email, phone number, or location. (If you send us feedback, we'll have whatever you choose to include.)
• Your check-ins stay on your phone. Emotions, notes, and saved verses are stored locally on your device, not on our servers.
• What you type in the AI chat is sent to an AI provider (Anthropic) to generate a response, through our own secure relay. It is used to reply to you, not to advertise to you or identify you.
• We don't sell your data, show ads, or track you across other apps.

What the app stores on your device

The following is saved locally on your device only (using your phone's app storage), and is not uploaded to any server we control:

• Your check-ins: the date, the emotion and category you selected, any context tags you chose (for example what you were doing or who you were with), a short note based on what you shared, and any Bible verse saved from a chat.
• A random device identifier the app generates on first launch (a string of letters and numbers). It is not linked to your identity — it's used only to apply usage limits (see below).

You can erase all of this at any time by deleting the app from your device.

What is sent when you use the AI chat

When you chat, pray, or look for a verse, the app sends the following to our relay server, which forwards it to our AI provider (Anthropic, maker of Claude) to generate a reply:

• The messages you type, the emotion and context you selected, and a brief summary of your recent check-ins and notes (from the past week) so the response fits your situation.
• Your random device identifier and a per-session identifier, used only to enforce usage limits and prevent abuse.

We never send your name or contact information to our AI provider.

Our relay server (Cloudflare)

To keep our AI credentials safe and to limit usage, chat requests pass through a small relay we operate on Cloudflare Workers. This relay:

• Forwards your chat request to Anthropic and returns the reply.
• Stores only counters (your device identifier plus a date and a request count) to enforce daily limits. These counters expire automatically after about two days and do not include the content of your messages.

Our AI provider (Anthropic)

The text described above is processed by Anthropic to generate the app's responses. Under Anthropic's commercial API terms, your inputs and the outputs are not used to train their models, and are retained by Anthropic only for a limited period consistent with its policies (for example, for trust-and-safety purposes). See Anthropic's privacy policy at anthropic.com/legal/privacy for details.

Feedback you send us

The app has an optional Feedback form, and you can also email us directly. If you use it, the message you write, a star rating, and any contact email you choose to include are sent through our Cloudflare relay and delivered to us by email using the email service Resend, so we can read your feedback and reply. Adding a contact email is optional and is used only to respond to you; we don't add you to any mailing list. If you don't give us a way to reach you, we won't be able to reply.

What we do NOT do

• We do not require an account, and we don't collect your name, phone number, or precise location. Email is collected only if you choose to include it when you contact us or send feedback (see above).
• We do not show advertising.
• We do not use third-party analytics or tracking SDKs, and we do not track you across other apps or websites.
• We do not sell or rent your information to anyone.

Sensitive information

Check-ins can reflect your emotions and your faith, which are personal and sensitive. We treat them accordingly: they are stored on your device, and the chat text sent to our AI provider is used only to respond to you. Please avoid sharing information that could identify you or others (full names, addresses, school names) in the chat — the app is designed to help without needing it.

Not a crisis or medical service

KnockKnock is not a therapist, counselor, or medical service, and does not provide medical or psychological advice. If you are in crisis or thinking about harming yourself, please reach out to a trusted adult or contact the 988 Suicide & Crisis Lifeline (call or text 988 in the U.S.).

Children's privacy

KnockKnock is intended for users 13 and older and is not directed to children under 13. We do not knowingly collect personal information from children under 13. Because the app has no accounts and collects no contact information, it does not gather identifying personal data from any user. If you believe a child under 13 has provided personal information, contact us and we will address it.

Data retention & deletion

• On your device: kept until you delete it in the app or uninstall the app.
• On our relay (Cloudflare): only usage counters, which expire automatically after about two days.
• At Anthropic: retained per Anthropic's policies for a limited period.
• Feedback you send: your message and any contact email stay in our email inbox so we can respond and follow up.

To erase what the app stores on your device, use Delete all my data in Settings → Security & data, or delete the app. To request deletion of feedback you emailed us, contact us at the address below.

Security

Chat requests are sent over encrypted connections (HTTPS). Our AI credentials are kept on the server side and never shipped inside the app. No method of transmission or storage is 100% secure, but we take reasonable measures to protect your information.

International users

The app's AI processing and relay may occur on servers located in the United States or other countries. By using the app, you understand that your chat content may be processed in those locations.

Changes to this policy

We may update this policy as the app evolves. When we do, we'll change the "Last updated" date above and post the new version at this page.

Contact

Questions about this policy or your data? Contact us at: yehsunkang@gmail.com

KnockKnock is an independent app. "Claude" and related marks are property of Anthropic; "Cloudflare" is a trademark of Cloudflare, Inc.; "Apple" and "App Store" are trademarks of Apple Inc. These companies are service providers or platforms and do not endorse this app.