About the app and maker
Record the trades you made on impulse—and the urges you resisted. Check your rules before placing an order, and take a break when you feel rushed.
Android · Free to download · Contains ads and in-app purchases
AI analysis · Premium Pass · Account and backup
This website and its guides are written and maintained by the maker of Principle Keeper. Situations and example rules illustrate how to use the app; they are not customer testimonials or trading results.
To use a sentence from a guide, enter or paste it into the app and save it yourself. Website notes are not automatically added to the app.
See the privacy policy for information about data handling. For support, describe your device, app version and what happened; do not send passwords or account credentials.
Start Principle Keeper on Google PlayWebsite analytics
This website uses Vercel Web Analytics for aggregate page views, referrals, country or region, device and browser statistics. We do not add advertising tracking cookies or send notes and rules entered in the guides. Query strings and fragments are removed from page URLs before sending. These statistics do not track activity inside the app or app installations.
How Vercel handles analytics data
GoatCounter additionally counts Google Play link clicks, audio play-button clicks, actual audio-demo starts and successful rule copies. The hero audio start and the Korean principle finder’s start, first result, audio start and successful copy are also counted with fixed action names. We send fixed action, page and interface-language labels, not a selected situation, rule text, notes, URL queries or referrers. This measurement adds no cookies or personal identifiers; sessions, device, location, referrer collection and individual records are disabled. Network requests still transmit information such as an IP address to the service, but we do not store it as an analytics field. Aggregate data is hosted in Germany and Finland; no automatic deletion period is currently set. Counts are not people or installations and may be incomplete due to blockers.