FeiCore Support
Version: 1.0.0 (1)
Updated: October 18, 2026
Developer: Gao Feirong (高飞荣, 子义飞云)
Contact: zyfly_app@qq.com
FeiCore is an offline journal for experiences you find draining or restorative, available as a one-time paid download with no subscriptions or in-app purchases. Review your entries by day, week or month. No account or ads.
The app interface in version 1.0.0 is available in Simplified Chinese only. This English page explains the features and how to get support.
How is FeiCore purchased?
Pay once when downloading FeiCore from the App Store. The current version has no subscriptions or in-app purchases. The price shown in your regional App Store applies.
Adding an entry
Tap the bottom record button (“记录”), choose drain (“消耗”) or recovery (“恢复”), and select a dictionary activity or enter a custom activity. Choose your subjective impact level, add an optional note of up to 80 characters, confirm the event time, and save. You can select an earlier time to log a past experience.
The dictionary contains 10 drain and 6 recovery activities, with short explanations, examples and references. Custom entries are grouped under Other. Activities can feel different for different people and at different times.
What do 10, 20 and 35 points mean?
The three impact levels use 10, 20 and 35 journal points. These are product-defined weights for summarizing your subjective entries, not scientific measurements or clinical scores.
The journal balance is the sum of recovery points minus the sum of drain points. A negative balance does not indicate illness or personal failure; a positive balance does not indicate health. Unlogged periods do not mean that no drain or recovery occurred. The points are not intended for comparisons between people.
Reviewing, editing and deleting
Switch between day, week and month on the timeline to review entries, trends and drain source rankings. Rankings show shares of recorded drain points, not time spent or the objective impact of events. Tap an existing entry to view its details, then edit or delete it.
You can clear local records in Settings. The app has no undo or app-managed recovery for cleared data. Any system backup and its restoration are managed by iOS and Apple's services.
Does FeiCore measure energy or assess health?
No. It summarizes the subjective entries you provide. It does not read physiological data, use mental health assessment scales, or provide diagnosis, treatment or personalized advice. References provide general context; they do not validate personal journal points or a fixed effect for any activity.
Permissions and internet access
Logging and statistics run locally. The app requests no system permissions and has no HealthKit, Apple Watch, third-party SDK or developer backend integration.
Privacy, support and reference links open in the system browser only when you choose them. Those visits use the internet, but the links do not include journal content. External pages may be unavailable offline; logging, the built-in dictionary and statistics remain available.
Changing phones or deleting the app
FeiCore has no app-managed cloud sync, export, backup or restore feature. Deleting the app removes its local app data from the current device. iOS system backups and device migration may include app data, depending on system settings. Clearing entries or deleting the app does not delete existing system backups. The developer cannot recover your local entries.
Devices and appearance
Requires iOS 17.0 or later, on iPhone in portrait orientation. The app interface is Simplified Chinese only. Store descriptions and website support materials are also provided in Traditional Chinese and English.
Appearance supports system, light and dark modes.
Contact support
Email the steps that led to the issue, app version, iOS version and iPhone model to zyfly_app@qq.com. Screenshots are optional; hide personal entries and anything you do not wish to share. Do not send passwords or your full journal.