Principle Keeper

Content rating
Everyone
10+
Downloads
Content rating
Everyone
Users Interact
Learn more
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About this app

When emotion takes over, the first thing to protect is the standard you set for yourself.

Principle Keeper is a trading routine app that helps you write your rules, see them, hear them repeated, and return to them before your next decision.

■ Write your own principles and collections
Keep each rule short and clear, arrange them in the order you need, and group them into collections such as Before the Market, After a Loss, or Stock Selection. Open a collection to focus only on the principles that matter in that moment.

■ Repeat principles with device voice
Listen to all principles or only the ones you select. Choose a reading language and playback interval. Available voices and quality depend on the voice data installed on your device.

■ Explore trading principle packs
Browse packs for beginner survival, pre-trade preparation, position sizing and loss budgets, FOMO and chasing, revenge trading, overtrading, and other common situations. Add one principle or an entire pack to your list.

■ Take a moment
When your judgment feels unsteady or you need a moment of calm, use the center button to slow your breathing and rest with gentle music.

■ Principle Community
Anyone can browse shared principles without signing in. With Google sign-in, you can create a public nickname and optional profile photo, share a principle, support a post, save a shared principle to your list, or report content. The community is currently Korean-first, so most posts may be in Korean.

■ See your rules after unlocking
On Android, you can allow display-over-other-apps and notification access so Principle Keeper can open after you unlock your screen. You can turn this feature off at any time in Settings.

Personal principles and collections are stored on your device. Uninstalling the app removes that local personal data. Community posts and account information are handled separately under the app's policies.

The app interface is available in Korean and English. Principle Keeper does not provide financial advice, stock recommendations, or promise investment results. All investment decisions and risks remain your responsibility.
See, hear, and return to your trading rules before emotion takes over.
Updated on
Sep 22, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • No data shared with third parties
    Learn more about how developers declare sharing
  • This app may collect these data types
    Personal info, Photos and videos, and App activity
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

9개 언어 지원을 추가했습니다.
원칙을 컬렉션으로 정리하고 원하는 묶음만 보고 들을 수 있습니다.
커뮤니티에서 원칙을 공유하고 공감할 수 있습니다.
마음을 가라앉히는 '잠시 쉬기' 기능과 음악을 추가했습니다.
전반적인 안정성과 사용성을 개선했습니다.
Content rating
Everyone
Users Interact
Learn more

App support

About the developer
이준성
wnstjddl369@gmail.com
서초대로74길 29 파라곤아파트, 1003호 서초구, 서울특별시 06621 South Korea