Last updated: 2026-05-07 -- Applies to all jiejuefuyou iOS apps + jiejuefuyou.github.io site + B2B services.
TL;DR: Zero analytics. Zero tracking. Zero data collection from the iOS apps. Your iPhone never tells me anything you do in AutoChoice / DaysUntil / PromptVault / AltitudeNow. The Privacy Manifest in each app declares this and the binary backs it up.
For the website + B2B consulting services: I store the email you voluntarily send me + your message. That's it.
None of these 4 apps collect, transmit, or share any personal data. They are 100% offline. Specifically:
The apps' source is public on GitHub:
You can run nm -gU AutoChoice.app/AutoChoice | grep -E "URLSession|HTTPS" to confirm no networking imports beyond Apple's required StoreKit endpoints.
Purchases are processed by Apple's StoreKit 2 framework. Apple handles all payment data; we never see your credit card or billing info. We only receive a transaction ID + the SKU you bought.
AltitudeNow reads the iPhone's built-in barometric pressure sensor to compute altitude. This data stays entirely on your device. It is never transmitted, logged, or stored beyond the active session.
Each app's privacy label on the App Store reflects this zero-collection promise:
The site is hosted on GitHub Pages. GitHub may collect standard server logs (IP address, user agent, requested URL). We have no access to these logs and cannot read them.
The site has zero JavaScript analytics. No Google Analytics, no Plausible, no Fathom. We don't know how many visitors you are.
The site does NOT set cookies. Lead capture forms (b2b-quiz / quick-quote / book-call / refer-a-friend / newsletter / prompts / and 12 other pages) POST your email to a webhook endpoint when you submit. This data goes to a lead management pipeline. No other third-party tracking. The pricing-ab-test page uses localStorage to remember which A/B variant you saw. This data lives in your browser only.
If you email me directly (jiejuefuyou@gmail.com or any +alias), I receive your email content + sender address. I store these emails in Gmail. I read every reply.
If you book a paid call ( starter / strategy / retainer), I keep:
I do NOT share your data with any third party. No CRM resale. No mailing list rental. No "would you like to be on a launch list" without explicit opt-in.
You can request deletion of all your data at any time by emailing jiejuefuyou+privacy@gmail.com. I respond within 4 hours JST (Mon-Fri).
If you subscribe to autoappnotes.substack.com, Substack stores your email address per their privacy policy. I can see subscriber count + email open rates aggregate. Individual reading habits are NOT visible to me beyond Substack's standard analytics.
Unsubscribe: every email has a one-click unsubscribe link at the bottom. Or email me and I'll remove you manually.
If you buy a prompt pack via jiejuefuyou.gumroad.com, Gumroad stores your purchase + email address per their privacy policy. I can see your email + product purchased + amount. I use this to send post-buy emails (walkthrough at T+3 days, survey at T+10, optional upsell at T+14). Reply STOP to any of those to opt out.
None of my apps or services are directed at children under 13. None collect data that could identify a child (we collect no data at all from the apps). All apps are rated 4+ which means safe for all ages, but they are not specifically targeted at the children's market.
If I change this policy, the "Last updated" date at the top will reflect that. Material changes will also be announced in the next Substack issue. The full change history is in the public Git history of site/privacy.html on GitHub.
Privacy questions: jiejuefuyou+privacy@gmail.com
General contact: jiejuefuyou@gmail.com
Mailing address: available on request via email (I'm a sole operator in Tokyo, Japan)