PeakD4Y
Harm Reduction Reference
Only for iPhone
Free · Designed for iPhone
iPhone
Educational harm reduction reference. Research-backed pharmacokinetic data, drug interaction warnings, and safety information. Not medical advice.
SUBST4NCE is an educational harm reduction reference app providing research-backed pharmacokinetic data and drug interaction warnings.
IMPORTANT DISCLAIMER
This app is NOT a medical device and does NOT provide medical advice. It is a visualization and reference tool for educational purposes only. Always consult healthcare professionals for medical decisions.
WHAT'S INSIDE
Comprehensive Substance Database
• 80+ substances across multiple categories
• Published pharmacokinetic data (half-lives, metabolism pathways)
• Mechanism of action explanations
• Data quality indicators showing research confidence levels
Interaction Checker
• Check combinations of multiple substances
• Understand potential interaction mechanisms
• Color-coded risk levels based on published research
• Plain-language explanations of why interactions matter
Visual Timeline
• See pharmacokinetic curves for substances
• Understand onset, peak, and duration patterns
• Multi-substance overlay visualization
• Body load indicators
Personal Context (Optional)
• Add your biological factors for educational context
• Weight, metabolism, and health considerations
• Tolerance tracking
• Current medications reference
Research Citations
• Every data point linked to published sources
• PubMed IDs and DOIs for verification
• FDA and WHO reference data
• "Limited data" warnings for research chemicals
CATEGORIES COVERED
• Alcohol & Cannabinoids
• Stimulants & Depressants
• Psychedelics & Dissociatives
• Prescription medications
• Research chemicals (with appropriate warnings)
• And more...
SAFETY FEATURES
• Emergency resources always accessible
• SAMHSA helpline integration
• Non-judgmental, educational framing
• Privacy-first: all data stored locally on your device
DESIGNED FOR
• Harm reduction education
• Healthcare students and professionals
• Researchers and educators
• Anyone seeking evidence-based substance information
This app does NOT:
• Provide dosing recommendations
• Calculate "safe" times to drive
• Facilitate procurement
• Replace professional medical advice
All information is compiled from peer-reviewed research and official sources. Users accept full responsibility for how they use this educational reference.
18+ only. By using this app, you acknowledge the terms and conditions presented at first launch.
Questions or feedback? Contact us through the support link.
Ratings & Reviews
This app hasn’t received enough ratings or reviews to display an overview.
The developer, Kevin Kulcsar, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Kevin Kulcsar
- Size
- 3.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- Languages
- English
- Age Rating
18+
- 18+
- This app has an age rating of 18+ with content restrictions. Some content may be rated higher, but access is managed by the developer through in-app controls.
- In-App Controls
Age Assurance
Frequent
Alcohol, Tobacco, or Drug Use or References
- Copyright
- © 2026 Kevin Kulcsar