Notes on building.
Guides on mobile apps, web platforms and AI products. Cost breakdowns, stack comparisons and how we ship.
How to Build an AI Avatar and Digital Human App Like HeyGen in 2026
HeyGen crossed $35M ARR and Synthesia passed $100M. Here is the full technical playbook for building an AI avatar platform that can compete in 2026.
How to build · Mar 17, 2026 · 15 min read
How to Build an Expense Management App Like Ramp or Brex in 2026
Ramp and Brex processed over $100B in card volume in 2025. Here is the full build playbook for vertical expense management platforms that can actually compete.
How to build · Mar 17, 2026 · 14 min read
How to Build a Medical Billing and Revenue Cycle Platform in 2026
Medical billing is a $6B market stuck in the early 2000s. Here is the full technical playbook for building a modern RCM platform that wins contracts from Waystar and AdvancedMD.
How to build · Mar 17, 2026 · 15 min read
How to Build an AI Interior Design App Like Decorilla in 2026
AI interior design apps like Decorilla and HomeDesigns AI turn photos of empty rooms into photoreal designs. Here's how to build one that users pay $30/month for.
How to build · Mar 15, 2026 · 14 min read
How to Build a Visitor Management System for Offices in 2026
Envoy and Proxyclick built billion-dollar categories by digitizing the paper sign-in sheet. Here's how to build a VMS your facilities team will actually deploy.
How to build · Mar 15, 2026 · 13 min read
How to Build a Digital Health Clinic Platform from Scratch in 2026
Hims and Ro generated over $2B combined in 2025 by pairing telemedicine with subscription pharmacy. Here's how to build a digital health clinic that scales.
How to build · Mar 15, 2026 · 15 min read
How to Build a Virtual Try-On App with AR for Retail in 2026
AR try-on lifts conversion 80-90% for apparel and beauty. Here's how to build a virtual try-on app that retail DTC brands can actually deploy.
How to build · Mar 15, 2026 · 14 min read
How to Build a Blood Donation and Donor Matching App in 2026
Blood Donor and BloodApp work with Red Cross chapters to match donors with hospitals in minutes. Here's how to build a blood donation app with real impact.
How to build · Mar 15, 2026 · 13 min read
How to Build an AI Podcast Editor and Production Tool in 2026
Descript, Riverside AI, and Podcastle turned podcast editing from a 6-hour slog into a 20-minute task. Here's how to build an AI podcast editor that creators pay for.
How to build · Mar 15, 2026 · 14 min read
How to Build a Resale and Thrift Marketplace App Like Poshmark in 2026
Resale hit $200B in 2025 with Poshmark, Vinted, and Depop leading. Gen Z buys resale 3x more than retail. Here's how to build a resale marketplace they love.
How to build · Mar 15, 2026 · 14 min read
How to Build an AI Study Buddy and Homework Helper App in 2026
Photomath, Socratic, and ChatGPT Study Mode are the #1 downloaded EdTech apps. Parents pay $10-$20/month for step-by-step help. Here's how to build one.
How to build · Mar 15, 2026 · 14 min read
How to Build a Wedding Planning and Vendor Marketplace App in 2026
Everything founders need to know about wedding planning app development in 2026, from core user journeys and marketplace architecture to payments, tech stack, and monetization.
How to build · Mar 13, 2026 · 14 min read