What is App Stack Builder?

App Stack Builder is a free AI-powered tool that helps founders and developers choose the right tech stack for their projects based on budget, app type, team size, and skill level.

What is the best tech stack for SaaS in 2026?

The best tech stack for SaaS in 2026 typically includes Next.js 16 for frontend, Supabase for database and auth, Vercel for hosting, Stripe for payments, and PostHog for analytics. App Stack Builder can generate a personalized recommendation based on your specific budget and requirements.

Is App Stack Builder free to use?

Yes, App Stack Builder is completely free to use. You can generate unlimited tech stack recommendations without any cost.

What types of apps can I build with the recommended stacks?

App Stack Builder supports various app types including SaaS applications, web apps, mobile apps, e-commerce stores, internal tools, and AI/ML products.

How much does a SaaS tech stack cost per month?

A modern SaaS tech stack can cost anywhere from $0-50/month for bootstrapped startups using free tiers, $100-300/month for growth-stage startups, to $500+/month for enterprise-ready infrastructure. App Stack Builder helps you find the best tools within your specific budget.

What is the best tech stack for solo founders?

For solo founders, we recommend Next.js + Vercel (free), Supabase (free tier), Supabase Auth (free), Stripe (pay as you go), and Plausible or PostHog for analytics. This stack can run your entire SaaS for under $50/month.

Can I export my tech stack recommendations?

Yes, you can export your tech stack recommendations as a PDF document or copy them to your clipboard. You can also share a link to your stack with others.

AppsFlyer vs PostHog: Which is Better in 2026?

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Analytics

Choosing between AppsFlyer and PostHog? Both are popular analytics tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.

AppsFlyer is for: Mobile app marketers who need to attribute installs and in-app actions to paid campaigns.

PostHog is for: Product teams who want analytics, session replay, feature flags, experiments and error tracking in one tool with a free monthly allowance.

Quick verdict

There’s no single winner; pick on your constraint. Choose AppsFlyer if you run paid campaigns for a mobile app and need to know which ones drive installs. Choose PostHog if you want product analytics, session replay and feature flags without stitching three tools together.

AppsFlyer vs PostHog — Side by Side

	AppsFlyer	PostHog
Category	Analytics	Analytics
What it is	Mobile attribution platform	Product analytics suite
What it measures	Installs and conversions by campaign	Product events, replays, flags, errors
Self-hosting	No (hosted)	Hobby deploy (about 100K events a month)
How you pay	Per conversion ($0.07 on Growth)	Free allowance, then per-product usage
Free access	12,000 conversions in the first year	1M events and 5K recordings a month
Pricing	Free · then usage-based	Free · then usage-based
Starting price	Free tier available	Free tier available
Free tier
Best for	Analytics — mobile attribution, paid campaigns, ROAS	Analytics — product analytics, session replay, feature flags

Pros & Cons

AppsFlyer

Free Zero plan: 12,000 conversions in the first year
Pay-as-you-go Growth at $0.07 per conversion
Organic installs are not counted

Zero plan excludes apps with paid activities
Fraud protection is on Enterprise
Measures attribution, not product funnels

PostHog

Free monthly allowance: 1M events and 5,000 recordings
Analytics, replay, flags and error tracking in one tool
Billing limit per product

Usage is billed separately for each product
Self-hosted hobby deploy suits about 100,000 events a month
Free plan keeps 1 year of data and 1 project

Key Features Compared

AppsFlyer

Zero (free): 12,000 free conversions in the first year; not for apps with paid activities
Growth: pay-as-you-go at $0.07 per conversion after the 12,000 free
Growth adds basic mobile attribution for paid campaigns
Enterprise: custom pricing with cross-channel attribution, ROAS optimization and fraud protection
Organic installs and actions are not counted and are free

PostHog

Free every month: 1M analytics events, 5,000 session recordings, 1M feature flag requests
Also free monthly: 100,000 error-tracking exceptions and 1,500 survey responses
Usage above the free allowance is billed per product, with a billing limit per product
Paid plans keep events 7 years (1 year on free) and allow 6 projects (1 on free)
Open source under MIT, except the ee directory; self-hosted hobby deployments suit about 100,000 events a month

Choose AppsFlyer if…

You run paid campaigns for a mobile app and need to know which ones drive installs.
You want to start pay-as-you-go rather than sign an annual contract.
You need mobile fraud detection on an enterprise plan.

AppsFlyer review & pricing

Choose PostHog if…

You want product analytics, session replay and feature flags without stitching three tools together.
You want a free tier that resets monthly, with or without a card on file.
You want to cap spend per product with billing limits.

PostHog review & pricing

Frequently Asked Questions

Is AppsFlyer better than PostHog?⌄

What is the difference between AppsFlyer and PostHog?⌄

What it is — AppsFlyer: Mobile attribution platform. PostHog: Product analytics suite. What it measures — AppsFlyer: Installs and conversions by campaign. PostHog: Product events, replays, flags, errors. Self-hosting — AppsFlyer: No (hosted). PostHog: Hobby deploy (about 100K events a month). How you pay — AppsFlyer: Per conversion ($0.07 on Growth). PostHog: Free allowance, then per-product usage. Free access — AppsFlyer: 12,000 conversions in the first year. PostHog: 1M events and 5K recordings a month.

AppsFlyer vs PostHog: which is cheaper?⌄

AppsFlyer pricing: Free · then usage-based. PostHog pricing: Free · then usage-based. Confirm current pricing on each tool's official site, as plans change.

When should I skip both AppsFlyer and PostHog?⌄

Skip AppsFlyer if you only need in-app usage analytics. Firebase Analytics is free. Skip PostHog if you only need simple website traffic stats. Plausible and Fathom are simpler.

Sources · tool facts checked November 2026