--- title: "PeakD4Y - Reviews, Revenue and Downloads in Hungary | Apple App Store" description: "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 N" --- # PeakD4Y — Hungary ![PeakD4Y App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/4c/39/f9/4c39f90e-15cd-285a-93d2-05619f7ad2b2/AppIcon-0-0-1x_U007ephone-0-1-85-220.png/434x0w.png) **Developer:** [Kevin Kulcsar](https://apptail.io/developer/kevin-kulcsar-CrjmZ) **Category:** Health Fitness **Rating:** N/A (0 ratings) **Price:** Free **Bundle ID:** com.peakday.app **Store:** Apple App Store **Country:** Hungary **Version:** 1.0 (released 2026-03-13) **Original Release:** 2026-03-13 **Languages:** English **App Store Link:** [Download on Apple App Store](https://apps.apple.com/hu/app/app/id6760320337) **AppTail Page:** [https://apptail.io/app/peakd4y-WaSy/hungary](https://apptail.io/app/peakd4y-WaSy/hungary) ## PeakD4Y Description 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. ## PeakD4Y Screenshots - [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/64/e1/f4/64e1f49d-e8f3-2566-346d-f8e3f978bcc6/New_Project-41.png/1242x2688.png) - [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/b4/02/8d/b4028d4f-1fef-ee78-ce06-c3b41fd13539/New_Project-43.png/1242x2688.png) - [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/c0/eb/14/c0eb1439-9f3e-5ad4-ee48-da53a0810bef/New_Project-42.png/1242x2688.png) - [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/8b/96/b6/8b96b6ed-bc2c-260d-65bf-24737cb2929f/New_Project-44.png/1242x2688.png) --- ## About AppTail [AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends. - [Search Apps](https://apptail.io) - [Top Charts](https://apptail.io/top-iphone-apps) - [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer) *Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*