ai-app-playbook

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Clone https://github.com/blakeandersonw/ai-app-playbook and read AGENTS.md

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How to build useful, profitable apps in 2026

My background: I’ve scaled 5 apps to $100k+ MRR in the past 3 years.

This is the stack I would start with today. We initially built EcoGPT (apply here) on this stack.

Good apps help people get fit, focus, learn, or feel calmer, and people pay for them. This playbook goes from picking a problem to your first profitable month.

Examples

Help people…	Like
💪 Get fit and eat better	Cal AI, Ladder, Yuka
📵 Take back their time	Opal, Structured
📚 Learn	Duolingo, Speak, Photomath
🧘 Feel calmer	Hallow, Finch
🌱 Understand the world	PictureThis, Yuka
💼 Earn	SideShift

The path

Phase	What	Check
0 · Niche	Pick a frequent problem AI solves in seconds. Test it with 10 videos and a waitlist	Score ≥ 25/35, real demand
1–12 · Build	Brief, repo, backend, auth, AI, web, iOS/Android, payments, analytics, onboarding, retention, launch	”Done when” per phase
13 · First 1,000	Short-form video, creators on SideShift / Trybe, DMs to influencers and meme pages	Content live and tracked
14 · Grow	Weekly: one funnel experiment, one product fix	Weekly report

The stack

Job	Use
Backend, data, files, jobs, email	Cloudflare (Workers, D1, R2, KV, Durable Objects, Queues, Workflows, AI Gateway)
Auth	Better Auth
Database at scale	PlanetScale
AI	OpenRouter, DeepSeek by default. Pick models with Artificial Analysis
Custom AI (ASR, image gen, self-hosted LLMs)	Vast.ai / RunPod. Much cheaper at volume
Payments	Superwall (mobile), Stripe (web)
Analytics + errors	Tinybird
Clients	SwiftUI for iOS, React Native or Kotlin for Android, React + Vite for web
Building	Claude Code, or OpenCode + DeepSeek

Don’t use: Vercel, Netlify, Lovable, Bolt, v0, Replit hosting, Bubble, FlutterFlow, Firebase, Supabase, Clerk, Auth0, Sentry, PostHog, Next.js, ORMs.

The money (per month)

Benchmark estimate: 30% of downloads start a trial, 30% of trials pay $30/year. That’s about $2.70 per download.

Downloads	1,000	10,000	100,000	1,000,000
Revenue	$2,700	$27,000	$270,000	$2,700,000
Superwall (1%)	$27	$270	$2,700	$27,000
Cloudflare	$5	$20	$190	$2,300
Tinybird	$0	$50	$275	$2,500
AI processing	$35	$350	$3,500	$35,000

Details: 12 · Costs.

Our stack vs. the popular stack*

Per 1,000 users per month.

Job	Ours	Cost	Popular	Cost	Popular costs
Hosting + API	Cloudflare Workers	$0.21	Vercel Pro	$3.48	~17×
Database + files	D1 + R2	$0.15	Supabase Pro	$1.62	~11×
Auth	Better Auth	$0	Clerk	$10.25	∞×
AI (60 calls/user)	DeepSeek	$29.43	OpenAI gpt-6.1-sol	$420.00	~14×
Analytics + errors	Tinybird	~$1.45	PostHog + Sentry	~$4.97	~3×
Email	Cloudflare Email	$1.04	Resend	$2.15	~2×

*Estimates at 100k monthly users, same usage, list prices as of Oct 26, 2026. Sources.

Chapters

#	Chapter
00	Find your niche	Patterns, scorecard, validation, domains
01	Building with agents	Harnesses, building fast, what not to use
02	Backend	One Worker, no framework
03	Database	D1 with plain SQL, then PlanetScale
04	Auth	Better Auth, anonymous first
05	AI	DeepSeek, Artificial Analysis, Vast.ai / RunPod
06	Clients	SwiftUI for iOS, React Native or Kotlin for Android, React + Vite for web
07	Payments & pricing	Superwall, Stripe, $30/year + trial
08	Analytics & errors	All in Tinybird
09	Design & UX	Finding UI to copy, onboarding
10	Retention	Push, streaks, email
11	Distribution	Short-form, creators, DMs, ASO
12	Costs	Numbers and sources
13	Security & compliance	Spend caps, privacy, App Store review

Templates: worker.ts · auth.ts · wrangler.jsonc · AGENTS.app.md · dev.vars.example

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MIT © Blake Anderson