Journal Multilingual is an open-source Android app for tracking substance use and accessing harm reduction information. It is a community fork of PsychonautWiki Journal with additional language support. Features: • Interaction checker — check potential risks when combining substances • Timeline view — visualize substance effects over time • Substance database — dosage, duration and risk info for over 100 substances, sourced from PsychonautWiki • Multi-language support — UI and substance data translated into Simplified Chinese, Traditional Chinese, and English • Pinyin search for Chinese substance names • Data export and import • Customizable app icon • Extension pack system for community-contributed data Privacy: No accounts. No cloud sync. All data stays on your device. Note: This is a community fork of the original PsychonautWiki Journal app.