HeightMax is an AI-powered health and fitness app focused on enhancing users' perceived height through personalized methods like posture improvement, stretching routines, mobility exercises, nutrition guidance, and daily habit tracking. Targeting the Grow Taller niche, it has garnered over 16,000 downloads and holds a 4.5-star rating based on 48 reviews. The app operates on a subscription-based model offering weekly, monthly, and yearly plans with prices localized by user country, showcasing a significant user base of 159 active subscribers. The business, which began operations in November 2025, shows consistent growth for the past five months driven mainly by organics from TikTok. It maintains a TikTok page with 4,000 followers and 240,000 likes, having created 234 promotional videos without paid marketing efforts. Most revenue ($4,794 out of $5,433) was generated recently, attributed to increased engagement on TikTok since March 2026. The app is sold due to the owner's shift in focus to another project. It offers an opportunity for expansion to other social media platforms like Instagram and Facebook. Included in the sale are the iOS and Android apps, TikTok page, app source code, handover documentation, and one month of support from the owner. It also includes a tutorial on creating TikTok carousels and a session with a broker to enhance the app. The app is ideal for those familiar with social media marketing with the capabilities to maximize its outreach and subscriber base, particularly someone adept in running effective ad campaigns while maintaining the app's 75.20% net margin.