Notes on building.
Guides on mobile apps, web platforms and AI products. Cost breakdowns, stack comparisons and how we ship.
Prompt Caching and Smart Routing: Cutting LLM API Costs by 80%
Most teams overpay for LLM inference by 3x to 5x because they send every request to the same expensive model with zero caching. Prompt caching and intelligent routing are the two highest-leverage cost optimizations you can make, and most teams ignore both.
Technology · Apr 25, 2026 · 14 min read
How Much Does It Cost to Build a Food Delivery App in 2026?
Food delivery app costs range from $40K for a focused MVP to $600K+ for a full three-sided marketplace. This guide breaks down every cost driver so you can plan your budget without guessing.
Cost & planning · Apr 25, 2026 · 14 min read
How Much Does It Cost to Build an E-Commerce App in 2026?
Building an e-commerce app can cost anywhere from $40,000 for a simple storefront to $300,000+ for a full marketplace platform. This guide breaks down real costs by app type, features, and development approach so you can plan your budget with confidence.
Cost & planning · Apr 25, 2026 · 14 min read
How Much Does It Cost to Build a Custom CRM System in 2026?
Building a custom CRM costs anywhere from $50K to $300K depending on features, integrations, and AI capabilities. This guide breaks down exact pricing by phase so you can budget with confidence.
Cost & planning · Apr 25, 2026 · 14 min read
How Much Does It Cost to Build a Fitness Tracking App in 2026?
A fitness tracking app can cost anywhere from $45K for a basic activity logger to $400K+ for a platform with wearable sync, AI coaching, and social features. Here is what actually drives those numbers.
Cost & planning · Apr 25, 2026 · 14 min read
How Much Does It Cost to Build a Social Media App in 2026?
Building a social media app is one of the most deceptively complex projects in software. Here is what it actually costs, from lean MVP to full-scale platform.
Cost & planning · Apr 25, 2026 · 14 min read
How to Build a Multi-Vendor E-Commerce Marketplace From Scratch
Multi-vendor marketplaces capture more GMV than single-seller stores because they solve inventory risk by letting others stock the shelves. Here is exactly how to build one that vendors actually want to sell on.
How to build · Apr 25, 2026 · 15 min read
How to Build an AI-Powered Fitness Coaching App From Scratch
AI coaching is replacing static workout templates across the fitness industry. This guide covers every technical and business decision involved in building an AI fitness coaching app that actually adapts to users in real time.
How to build · Apr 25, 2026 · 15 min read
How to Build a Vertical AI Agent for Your Industry From Scratch
Generic LLMs plateau fast in specialized domains. This guide walks you through building a vertical AI agent from scratch, covering domain modeling, data strategy, evaluation, and production deployment for your specific industry.
How to build · Apr 25, 2026 · 15 min read
How to Build an Encrypted Real-Time Messaging App From Scratch
Most teams bolt encryption onto a chat app as an afterthought and end up with a system that leaks metadata, breaks on group messages, or collapses under key rotation. If you want to build an encrypted messaging app that actually protects users, encryption has to be the foundation, not a feature flag.
How to build · Apr 24, 2026 · 14 min read
How to Build an Autonomous AI QA Testing Pipeline for Your App
Manual QA is a bottleneck that burns budget and still lets bugs through. This guide walks you through building an AI-powered testing pipeline that generates tests from user flows, heals broken selectors automatically, and plugs directly into your CI/CD process.
How to build · Apr 24, 2026 · 14 min read
Agentic Coding Workflows: Using AI Agents to Ship Features Faster
The copilot era is already over. Agentic coding workflows hand entire feature branches to AI agents that plan, implement, test, and iterate autonomously. Here is how leading teams are restructuring around this shift and the guardrails that keep code quality high.
Technology · Apr 24, 2026 · 14 min read