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.

Firebase Analytics vs PostHog: Which is Better in 2026?

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Analytics

Choosing between Firebase Analytics 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.

Firebase Analytics is for: Mobile app teams on Firebase who want free in-app analytics linked to the rest of the Firebase project.

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 Firebase Analytics if your app already uses Firebase. Choose PostHog if you want product analytics, session replay and feature flags without stitching three tools together.

Firebase Analytics vs PostHog — Side by Side

	Firebase Analytics	PostHog
Category	Analytics	Analytics
What it is	App analytics in Firebase	Product analytics suite
What it measures	In-app events and engagement	Product events, replays, flags, errors
Self-hosting	No (hosted by Google)	Hobby deploy (about 100K events a month)
How you pay	No cost on Spark and Blaze plans	Free allowance, then per-product usage
Free access	Full product	1M events and 5K recordings a month
Pricing	Free	Free · then usage-based
Starting price	Free tier available	Free tier available
Free tier
Best for	Analytics — mobile apps, Firebase, free	Analytics — product analytics, session replay, feature flags

Pros & Cons

Firebase Analytics

No cost on Spark and Blaze plans
Linked to other Firebase products in the project
SDKs for iOS and Android

Built for apps rather than website-only analytics
Hosted by Google only; no self-hosting

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

Firebase Analytics

Analytics is a no-cost product on both the Spark (free) and Blaze (pay-as-you-go) plans
Listed alongside other no-cost Firebase products such as A/B Testing and App Distribution
No-cost usage quotas apply at the project level

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 Firebase Analytics if…

Your app already uses Firebase.
You want free in-app event analytics for iOS and Android.
You want analytics linked to other Firebase products in the same project.

Firebase Analytics 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 Firebase Analytics better than PostHog?⌄

What is the difference between Firebase Analytics and PostHog?⌄

What it is — Firebase Analytics: App analytics in Firebase. PostHog: Product analytics suite. What it measures — Firebase Analytics: In-app events and engagement. PostHog: Product events, replays, flags, errors. Self-hosting — Firebase Analytics: No (hosted by Google). PostHog: Hobby deploy (about 100K events a month). How you pay — Firebase Analytics: No cost on Spark and Blaze plans. PostHog: Free allowance, then per-product usage. Free access — Firebase Analytics: Full product. PostHog: 1M events and 5K recordings a month.

Firebase Analytics vs PostHog: which is cheaper?⌄

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

When should I skip both Firebase Analytics and PostHog?⌄

Skip Firebase Analytics if you need attribution for paid install campaigns. AppsFlyer measures those. Skip PostHog if you only need simple website traffic stats. Plausible and Fathom are simpler.

Sources · tool facts checked November 2026