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.

Feature Flags & ExperimentsFree tier

ConfigCat: Pricing, Features & Alternatives

ConfigCat is deliberately the boring option: flags, targeting rules and percentage rollouts with a 10-minute integration, published flat prices, and a free tier that stays free. There is no experimentation engine and no analytics — if you want a flag service rather than a product platform, that is the appeal.

ConfigCat Pricing Plans (2026)

Plan	Price	Highlights
Free	$0 forever	Unlimited flag evaluations · 10 flags · 2 environments
ProPopular	$110 / month	100 feature flags · 3 environments · 3 products
Smart	$325 / month	Unlimited flags and environments · 10 products · Audit logs

Pricing summary: Free · paid from $110/mo. Always confirm current pricing on the official site.

Key ConfigCat Features

100 feature flags
3 environments
3 products
Email support

Pros

+Flat, published pricing
+Free tier is unlimited on evaluations
+Fast to integrate
+No usage cliff to monitor

Cons

−No experimentation or analytics
−Flag caps on lower tiers
−Fewer integrations than the leaders

Best ConfigCat Alternatives

Compare all

LaunchDarkly

Free · then usage-based

Statsig

Free · paid from $150/mo

GrowthBook

Free · paid from $40/seat/mo

Unleash

Free · paid from $75/seat/mo

Flagsmith

Free · paid from $45/mo

ConfigCat Compared

ConfigCat vs LaunchDarkly ConfigCat vs Statsig ConfigCat vs GrowthBook ConfigCat vs Unleash ConfigCat vs Flagsmith

ConfigCat FAQ

What is ConfigCat used for?⌄

ConfigCat is a feature flags & experiments tool. Straightforward hosted feature flags with a free tier that never expires and flat, published pricing.

Is ConfigCat free?⌄

Yes — ConfigCat has a free tier you can start with, and paid plans for more usage and features.

How much does ConfigCat cost?⌄

ConfigCat offers a free tier, with paid plans starting at $110/month.

What are the best ConfigCat alternatives?⌄

Popular ConfigCat alternatives include LaunchDarkly, Statsig, GrowthBook, Unleash, Flagsmith. Compare pricing and features on our ConfigCat alternatives page.